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  Topic: WB Warning msg on Geometry
zhang.li

Replies: 4
Views: 5153

PostForum: XANSYS   Posted: Fri May 29, 2015 7:29 am   Subject: Re: [Xansys] WB Warning msg on Geometry
That message means that the normal vector of the surface is pointing the
wrong direction. The easiest thing to do is use the 'Surface Flip' command
on the offending body in Design Modeler. If you ...
  Topic: WB Warning msg on Geometry
zhang.li

Replies: 4
Views: 5153

PostForum: XANSYS   Posted: Fri May 29, 2015 5:39 am   Subject: WB Warning msg on Geometry
I was shown a warning reading: The following surface or surface bound may have incorrect orientation.

The surface it points to is a rounded surface.

What does it exactly mean please?

Regards,
  Topic: looking for Help information
zhang.li

Replies: 0
Views: 2023

PostForum: XANSYS   Posted: Tue May 26, 2015 12:47 am   Subject: looking for Help information
Dear all,
i've done some Harmonic Response analysis, and have some problem interpreting the Results. Particularly on the following:
1) Total Deformation, using Definition by "Frequency"
2 ...
  Topic: [WB Mechanical] Rotorhub stress analysis BC enquiry
zhang.li

Replies: 24
Views: 24748

PostForum: XANSYS   Posted: Sun Jan 26, 2014 6:02 pm   Subject: reference
can anyone recommend a good, comprehensive mechanical design handbook please?

Li Zhang
Beijing Jiaotong university
  Topic: [WB]PCB chip thermal analysis
zhang.li

Replies: 0
Views: 1146

PostForum: XANSYS   Posted: Sun Dec 01, 2013 7:52 pm   Subject: [WB]PCB chip thermal analysis
Dear all,
while looking at/following some articles to perform thermal analysis on PCB boards, they usually load the heat source in W/m^3 on the microchip.

i suppose, the volume of the microship ha ...
  Topic: geometry strength comparison
zhang.li

Replies: 2
Views: 2339

PostForum: XANSYS   Posted: Fri Jun 21, 2013 1:55 am   Subject: geometry strength comparison
Dear all,

if i were to compare the strengths of 2 geometry, say an area, where Area A is larger than Area B, should i compare the results using the SAME element size or the SAME number of elements ...
  Topic: motor acoustic analysis
zhang.li

Replies: 3
Views: 5131

PostForum: XANSYS   Posted: Sun Jun 16, 2013 6:01 am   Subject: motor acoustic analysis
Dear all,

i would like to study the acoustic noise due to motor vibration.

1) am i in the right direction to venture into acoustic-structural coupling please?

2) can i ONLY perform this acous ...
  Topic: rotor balancing
zhang.li

Replies: 2
Views: 2128

PostForum: XANSYS   Posted: Fri May 31, 2013 3:28 am   Subject: rotor balancing
Dear Li,

a rotor has to be considered rigid if the operating speed is minimum 30 % under the first bending mode. (ISO 11342)

Thanks a lot Francesco. i'll look into it.

Li
Beijing Jiaotong Un ...
  Topic: rotor balancing
zhang.li

Replies: 2
Views: 2128

PostForum: XANSYS   Posted: Tue May 28, 2013 11:08 pm   Subject: rotor balancing
Dear all,

does running a rotordynamic analysis help me identify whether if my rotor design is classified as flexible rotor or rigid rotor please?

regards,
Li
Beijing Jiaotong University
  Topic: stress error for orthotropic material
zhang.li

Replies: 2
Views: 2957

PostForum: XANSYS   Posted: Thu Jan 03, 2013 10:26 pm   Subject: stress error for orthotropic material
Dear all,

i would like to compute the stress error contour but encountered an error message claiming that: The Structural Error result is currently not supported for orthotropic materials.

Is th ...
  Topic: [MAPDL] Reference Temperature
zhang.li

Replies: 7
Views: 14649

PostForum: XANSYS   Posted: Fri Dec 07, 2012 1:30 am   Subject: Re: [Xansys] [MAPDL] Reference Temperature
Hello Muhammad,

I agree with Martin. Reference temperature is the stress-free temperature and is often room temperature.

Dear Richard,

To clarify:
1) If my stress-free temperature in Celciu ...
  Topic: calculating stress intensity
zhang.li

Replies: 15
Views: 18944

PostForum: XANSYS   Posted: Sat Nov 17, 2012 6:35 am   Subject: RE: [Xansys] calculating stress intensity
Dear all,

thank you all for your replies and comments.

for my enquiries below:
am i right to understand that:
1) if the calculated stress at a given load is greater than the tensile strength o ...
  Topic: calculating stress intensity
zhang.li

Replies: 15
Views: 18944

PostForum: XANSYS   Posted: Thu Nov 15, 2012 8:32 am   Subject: calculating stress intensity
could i embarassingly ask for clarity:

am i right to understand that:
1) if the calculated stress at a given load is greater than the tensile strength of a material, then it means the component at ...
  Topic: [Xansys] Hardware, september 2011
zhang.li

Replies: 13
Views: 14383

PostForum: XANSYS   Posted: Mon Sep 10, 2012 8:23 am   Subject: [Xansys] Hardware, september 2011
Dear all,

if i want to just create my project and save my results in a remote harddisk, but run the preprocessing, solvers and postprocess on my local laptop/computer, does this still require me to ...
  Topic: Bolt Pre-torque - ANSYS WB 14
zhang.li

Replies: 12
Views: 13734

PostForum: XANSYS   Posted: Thu Aug 30, 2012 12:46 am   Subject: Bolt Pre-torque - ANSYS WB 14
I have experimented with the joint load for applying bolt pre-load. It seemed to work pretty cleanly. I created a cylindrical joint between two holes with the Z axis of the reference CSYS defined axia ...
  Topic: [Xansys] Hardware, september 2011
zhang.li

Replies: 13
Views: 14383

PostForum: XANSYS   Posted: Wed Aug 29, 2012 11:41 pm   Subject: Re: [Xansys] Hardware, september 2011
// Distributed ANSYS Guide


Best regards,

Bram Weisman, P.E.
Principal Engineer/Analyst - Mechanical Design

Thanks Bram. I'll read it.

regards,
Li Zhang
Beijing Jiaotong university
  Topic: displaying contraction/expansion in deformation
zhang.li

Replies: 0
Views: 1313

PostForum: XANSYS   Posted: Wed Aug 29, 2012 11:32 pm   Subject: displaying contraction/expansion in deformation
Dear all,

i would like to display nodal displacement with the contour to indicate where contraction/expansion has occurred.

imagine a rectangular block being pulled on both axial ends in the x-d ...
  Topic: [Xansys] Hardware, september 2011
zhang.li

Replies: 13
Views: 14383

PostForum: XANSYS   Posted: Sat Aug 25, 2012 8:06 am   Subject: Re: [Xansys] Hardware, september 2011
Hi Li,

Are you talking about logging onto 1 of the machines and launching 3 jobs on others (like rlogin) or taking 1 big job and spreading it over four machines worth of memory and cpus?


Dan B ...
  Topic: [Xansys] Hardware, september 2011
zhang.li

Replies: 13
Views: 14383

PostForum: XANSYS   Posted: Thu Aug 23, 2012 8:24 pm   Subject: clustering desktops together for computational efficiency?
Dear all,

is there a method to connect 4 of my lab's desktop PCs (Win XPx64, all different speeds, installed with WB v13) together, so that they can share the computing resources from one another, ...
  Topic: material props settings
zhang.li

Replies: 4
Views: 3755

PostForum: XANSYS   Posted: Fri Aug 03, 2012 2:11 am   Subject: Re: material props settings
You would do that for defining the friction coeff for the contact pair. No other mat prop is needed. For example I might be doing an analysis where there are many contact locations with different valu ...
  Topic: material props settings
zhang.li

Replies: 4
Views: 3755

PostForum: XANSYS   Posted: Fri Aug 03, 2012 1:57 am   Subject: material props settings
Dear all,

i was reading through some really old notes left by a colleague who was performing radial press fitting. in the notes, a material had only the friction coefficient value defined and nothi ...
  Topic: material of different elongation/ductility/brittleness
zhang.li

Replies: 2
Views: 4217

PostForum: XANSYS   Posted: Thu Jul 26, 2012 6:00 pm   Subject: material of different elongation/ductility/brittleness
Dear all,

i've been asked to conduct the strength of an aluminum cap when it is bolted onto another part with a gasket in between them to achieve sealing. They fear that if the cap's thickness is i ...
  Topic: [WB Structural]Warning enquiry
zhang.li

Replies: 6
Views: 16756

PostForum: XANSYS   Posted: Wed Jul 25, 2012 9:54 pm   Subject: [WB Structural]Warning enquiry
Dear all,

i'm running a rotor rotation steady-state stress analysis with tangential fixed boundary condition on the ID surface and high speed load.

At the end of the solution, a warning claims & ...
  Topic: [WB Mechanical] Rotorhub stress analysis BC enquiry
zhang.li

Replies: 24
Views: 24748

PostForum: XANSYS   Posted: Wed Jul 11, 2012 7:48 am   Subject: Re: [Xansys] [WB Mechanical] Rotorhub stress analysis BC enq
Hi Dan, thanks again for your kind response and frankness in guidance. Some of my response to your responses below:

Why not model the shaft if you are so concerned about its effect on the problem? ...
  Topic: [WB Mechanical] Rotorhub stress analysis BC enquiry
zhang.li

Replies: 24
Views: 24748

PostForum: XANSYS   Posted: Wed Jul 11, 2012 2:09 am   Subject: Re: [Xansys] [WB Mechanical] Rotorhub stress analysis BC enq
Why would you constraint the ID radially?

Hello again Dan. Thanks for your response.

I'm looking for comments/experience sharing on how should i realistically constraint my rotor hub model when ...
  Topic: [WB Mechanical] Rotorhub stress analysis BC enquiry
zhang.li

Replies: 24
Views: 24748

PostForum: XANSYS   Posted: Tue Jul 10, 2012 9:19 am   Subject: Re: [Xansys] [WB Mechanical] Rotorhub stress analysis BC enq
Well if you constrain the ID to zero deflection - I imagine the greatest will be at the OD.

Hi Dan,
thanks for your response. however, did you agree/disagree with constraining the ID radially for ...
  Topic: [WB Mechanical] Rotorhub stress analysis BC enquiry
zhang.li

Replies: 24
Views: 24748

PostForum: XANSYS   Posted: Tue Jul 10, 2012 8:16 am   Subject: Re: [Xansys] [WB Mechanical] Rotorhub stress analysis BC enq
Hi Li,

A couple of questions - if the ID shaft is "not included in the model for this exercise" why is it mentioned?


Basically, i am saying the model is a hollow, cylinder.

You m ...
  Topic: [WB Mechanical] Rotorhub stress analysis BC enquiry
zhang.li

Replies: 24
Views: 24748

PostForum: XANSYS   Posted: Mon Jul 09, 2012 11:59 pm   Subject: [WB Mechanical] Rotorhub stress analysis BC enquiry
Dear all,

I'm trying to understand, determine the correct boundary condition to constraint my rotor hub model (has an ID for a shaft but not included in the model during this exercise) to perform a ...
  Topic: file.full not found on spectrum analysis
zhang.li

Replies: 3
Views: 3297

PostForum: XANSYS   Posted: Tue May 22, 2012 7:18 pm   Subject: Re: [Xansys] file.full not found on spectrum analysis
Li Zhang,

If you are running a 3D solid element model with PCG solvers, probability it could be due to MSAVE issues.
Insert a command snippet under static & modal analysis and put MSAVE,OFF ...
  Topic: file.full not found on spectrum analysis
zhang.li

Replies: 3
Views: 3297

PostForum: XANSYS   Posted: Mon May 21, 2012 9:18 pm   Subject: file.full not found on spectrum analysis
Dear all,

i would like to perform a spectrum analysis with an acceleration profile after a pre-stress modal analysis. But the spectrum analysis keeps claiming an error 'file.full' not found.

in ...
  Topic: temperature dependent load enquiry
zhang.li

Replies: 4
Views: 4643

PostForum: XANSYS   Posted: Thu Mar 15, 2012 10:28 pm   Subject: Re: [Xansys] temperature dependent load enquiry
On 15/03/2012 01:10, zhang.li wrote:

in electrical machines, my copper loss is dependent on resistance, and resistance is dependent on temperature. hence, i would like to input my coil heat generat ...
  Topic: temperature dependent load enquiry
zhang.li

Replies: 4
Views: 4643

PostForum: XANSYS   Posted: Thu Mar 15, 2012 4:50 pm   Subject: Re: [Xansys] temperature dependent load enquiry
Do you have "classic" Ansys Mechanical APDL available?

hi danbohlen,

yes, i do have classic Ansys Mech apdl. are you suggesting that in ANSYS WB, i add a 'Command' inside the 'Solutio ...
  Topic: temperature dependent load enquiry
zhang.li

Replies: 4
Views: 4643

PostForum: XANSYS   Posted: Wed Mar 14, 2012 6:10 pm   Subject: temperature dependent load enquiry
Dear all,

in electrical machines, my copper loss is dependent on resistance, and resistance is dependent on temperature. hence, i would like to input my coil heat generation load as a function of t ...
  Topic: CFX results to Thermal for Transient analysis
zhang.li

Replies: 0
Views: 2535

PostForum: XANSYS   Posted: Mon Feb 27, 2012 7:14 pm   Subject: CFX results to Thermal for Transient analysis
Dear all,

i'm trying to perform a transient thermal analysis, using CFX convection data.
While starting the thermal analysis in WBv13, an error below prompted me:
Time specified for an imported ...
  Topic: Interference fit simulation
zhang.li

Replies: 5
Views: 9643

PostForum: XANSYS   Posted: Fri Oct 07, 2011 6:35 am   Subject: Interference fit simulation
Dear all,

for such contact analysis as interference fit simulationg, between ANSYS WB Structural and ANSYS LS-DYNA, which one is more preferable please?

regards,
Li Zhang,
Beijing Jiaotong Uni ...
  Topic: frictionless contact: Near open status enquiry
zhang.li

Replies: 10
Views: 16785

PostForum: XANSYS   Posted: Mon Aug 15, 2011 6:59 am   Subject: [Xansys] frictionless contact: Near open status enquiry
Dear all,

what does it mean in Ansys, that a frictionless contact is 'near open' or 'open' status please?

should i remedy the status to close? should all contact initial status be 'closed' pleas ...
  Topic: frictionless contact: Near open status enquiry
zhang.li

Replies: 10
Views: 16785

PostForum: XANSYS   Posted: Sun Aug 07, 2011 6:27 pm   Subject: Re: [Xansys] R: frictionless contact: Near open status enqu
Dear all,

thank you for your replies and initiatives to help out. i apologize for not being clear enough.

the bolt faces are divided in a way that the threaded part that comes in contact with th ...
  Topic: frictionless contact: Near open status enquiry
zhang.li

Replies: 10
Views: 16785

PostForum: XANSYS   Posted: Thu Aug 04, 2011 11:44 pm   Subject: frictionless contact: Near open status enquiry
Dear all,

i'm attempting to perform bolt pretension analysis using WB v11. i have 4 bolts clamping 2 disks with 4 nuts.

the bolt thread faces are defined as frictionless with the holes on the di ...
  Topic: torsional stiffness estimation
zhang.li

Replies: 1
Views: 2216

PostForum: XANSYS   Posted: Thu Jul 07, 2011 4:16 am   Subject: torsional stiffness estimation
dear all,

i would like to estimate the torsional stiffness of my shaft design.

i've applied torque at one end of the shaft, and fix the other end of the shaft. i obtain hoop stresses, circumfere ...
  Topic: Postprocessing cross-section average stress value
zhang.li

Replies: 2
Views: 5236

PostForum: XANSYS   Posted: Tue May 31, 2011 3:47 am   Subject: Postprocessing cross-section average stress value
Dear all,

i would like to extract the average hoop stress at the cross section area of a cylinder, to estimate the tangential force.

1) do i need to prepare anything in the DesignModeler before ...
  Topic: Rotordynamics - modelling an imbalance
zhang.li

Replies: 9
Views: 10760

PostForum: XANSYS   Posted: Sun Apr 03, 2011 10:58 pm   Subject: OOB from coupled component
dear all,

is it necessary to study the imbalance of my component due to the imbalance of a component mechanically coupled to my component please?

does it mean that i'll have to consider my compo ...
  Topic: rotor burst detection during test
zhang.li

Replies: 3
Views: 3255

PostForum: XANSYS   Posted: Wed Feb 09, 2011 8:07 pm   Subject: further enquiries
Hi Nick,

thank you so much for your reply and information.

a few more enquiries if i may:
1) how do you define a rotor burst event please? For me, 'burst event' has 2 kinds: 1] rotor components ...
  Topic: rotor burst detection during test
zhang.li

Replies: 3
Views: 3255

PostForum: XANSYS   Posted: Fri Feb 04, 2011 9:59 pm   Subject: rotor burst detection during test
Dear all,

i'm attempting to develop a rotor burst testbench in order to verify the predicted burst speed and overspeed conditions of the rotor.

Has anyone any idea/suggestions how i can detect r ...
  Topic: rotor burst energy
zhang.li

Replies: 0
Views: 1392

PostForum: XANSYS   Posted: Wed Jan 19, 2011 7:20 am   Subject: rotor burst energy
Dear all,

could i ask, if a rotor burst, will the maximum energy of the fragments flying out be as simple as the kinetic energy of the rotor just before burst please?

Regards,
Li Zhang
Beijing ...
  Topic: Rotordynamics - modelling an imbalance
zhang.li

Replies: 9
Views: 10760

PostForum: XANSYS   Posted: Sun Jan 16, 2011 4:14 am   Subject: Re: Post subject: rotor imbalance modeling
[quote="pete.young"]...
To do a harmonic analysis you have to apply your out-of-balance as a force to your model using the F command.

You will need to enter two separate F commands and s ...
  Topic: Rotordynamics - modelling an imbalance
zhang.li

Replies: 9
Views: 10760

PostForum: XANSYS   Posted: Mon Jan 10, 2011 4:40 am   Subject: rotor imbalance model
Dear Pete Young,

thank you for your feedback the sharing.

how did you estimate what imbalance force to apply onto your model please?

i've been given balancing requirements are G6.3 to G2.5, b ...
  Topic: Rotordynamics - modelling an imbalance
zhang.li

Replies: 9
Views: 10760

PostForum: XANSYS   Posted: Sat Jan 08, 2011 7:57 pm   Subject: rotor imbalance modeling
Dear all,

i'm given a rotor dynamic balancing criteria: min G6.3 to max G2.5.

can i use this min and max limit to apply as unbalance force and perform a harmonic analysis on the rotor assembly t ...
  Topic: radial displacement
zhang.li

Replies: 6
Views: 10548

PostForum: XANSYS   Posted: Thu Nov 11, 2010 11:15 pm   Subject: radial displacement
in fact, CSYS,1 defines the z-axis in Classics as the axis of rotation.

so, easiest way to do on your model, is to align your model's axis of rotation to the global z-axis in your CAD software, the ...
  Topic: radial displacement
zhang.li

Replies: 6
Views: 10548

PostForum: XANSYS   Posted: Thu Nov 11, 2010 11:13 pm   Subject: radial displacement
the axis of rotation is perpendicular to the direction of rotation of your model. you'll have to find that out yourself, because you have not describe how your model looks like.

if you have a shaft ...
  Topic: radial displacement
zhang.li

Replies: 6
Views: 10548

PostForum: XANSYS   Posted: Thu Nov 11, 2010 5:22 pm   Subject: radial displacement
Assalamualaikum Ehsan, apa khabar? :)

are you performing the constraint in workbench or classics?

on either platforms, you'll have to define a local cylindrical coordinate system or change to a ...
  Topic: Thermal internal Heat generation enquiry
zhang.li

Replies: 2
Views: 3069

PostForum: XANSYS   Posted: Wed Dec 30, 2009 5:38 pm   Subject: Thermal internal Heat generation enquiry
Dear all,

I've an enquiry on applying Internal Heat Generation for a thermal analysis.

while applying Internal Heat Generation to a body, should i be concern of the body's the real mass or real ...
  Topic: material property for insulation paper
zhang.li

Replies: 0
Views: 1384

PostForum: XANSYS   Posted: Sun Dec 27, 2009 11:20 pm   Subject: material property for insulation paper
Hi guys,

it is a long shot.... but will ask it anyway.

anyone has any idea what the poisson ratio is for NOMEX 410 insulating paper please?

have tried enquiry to Dupont, but no answer.

i'm ...
  Topic: uncertain on Transient thermal analysis...
zhang.li

Replies: 4
Views: 4406

PostForum: XANSYS   Posted: Sat Dec 19, 2009 7:38 am   Subject: [Xansys] uncertain on Transient thermal analysis...
Hi Martin, thank you for your response again.

my smallest timestep is 1e-2.

WB resulted an error, saying that i had to use higher order elements. Hence, i used midside nodes. is this one of the ...
  Topic: uncertain on Transient thermal analysis...
zhang.li

Replies: 4
Views: 4406

PostForum: XANSYS   Posted: Sat Dec 19, 2009 4:42 am   Subject: uncertain on Transient thermal analysis...
Dear all,

i'm performing a transient thermal analysis of multiple bodies of multiple materials.

The load history is like:
time[s]...............heat generation[W/m^3]
0.....................0
...
  Topic: guideline to auto time step settings?
zhang.li

Replies: 3
Views: 3202

PostForum: XANSYS   Posted: Fri Dec 18, 2009 4:50 am   Subject: [Xansys] guideline to auto time step settings?
Hi Martin,

Thanks for your reply.

To calculate Thermal diffusivity, i need to input density, heat capacity and conductivity of material.

What if i have more than one material in the simulatio ...
  Topic: guideline to auto time step settings?
zhang.li

Replies: 3
Views: 3202

PostForum: XANSYS   Posted: Fri Dec 18, 2009 4:08 am   Subject: guideline to auto time step settings?
Dear all,

i'm having difficulties setting an appropriate timestepping intervals for a transient run for the following load history.

time[s] heat generation
------------------------------
...
  Topic: CFX-Workbench error message
zhang.li

Replies: 1
Views: 2450

PostForum: XANSYS   Posted: Thu Nov 26, 2009 10:45 pm   Subject: CFX-Workbench error message
After several trials, i think i may have found a solution to this error message.

the key is to maintain the same mesh in WB and CFX.

The mesh used in the CFX calculation, has to be the same in W ...
  Topic: Transient thermal problem
zhang.li

Replies: 4
Views: 3483

PostForum: XANSYS   Posted: Wed Nov 25, 2009 7:50 pm   Subject: Transient thermal problem
Dear all,

i'm performing a transient thermal on an electrical machine model with copper and iron losses, with initial temperature at 90C.

i've created multiple time steps, some defined with cons ...
  Topic: retrieving results into Workbench v11
zhang.li

Replies: 0
Views: 1339

PostForum: XANSYS   Posted: Tue Nov 24, 2009 5:39 pm   Subject: retrieving results into Workbench v11
Dear all,

There was a electrical shutdown, and computer was turned off. Inevitably, my transient calculations were done half-way.

When i opened the Project file, i see that the folders of the Tr ...
  Topic: [Xansys] [WB][CFX]Fluid-Thermal analysis steps need verif
zhang.li

Replies: 8
Views: 15993

PostForum: XANSYS   Posted: Wed Nov 18, 2009 1:44 am   Subject: [Xansys] [WB][CFX]Fluid-Thermal analysis steps need verif
Hi Shailendra,

thanks for your reply.

i'm trying with a coarse meshing on the solids, and simulation is running now.

Regards,
Li ZHANG
Beijing Jiaotong University
  Topic: [Xansys] [WB][CFX]Fluid-Thermal analysis steps need verif
zhang.li

Replies: 8
Views: 15993

PostForum: XANSYS   Posted: Tue Nov 17, 2009 1:26 am   Subject: [Xansys] [WB][CFX]Fluid-Thermal analysis steps need verif
Hi Shailendra,

Thanks so much for your quick reply.

I just like to make an additional comment that, i asked about the coarser mesh approach is because i encountered an error saying:

ERROR #00 ...
  Topic: [Xansys] [WB][CFX]Fluid-Thermal analysis steps need verif
zhang.li

Replies: 8
Views: 15993

PostForum: XANSYS   Posted: Tue Nov 17, 2009 12:57 am   Subject: [Xansys] [WB][CFX]Fluid-Thermal analysis steps need verif
Hello again Shailendra Singh,

Again, i need some advice on modeling a CHT analysis between fluid and solid.

my model consists of a housing with cooling channels in it, and a cylindrical solid th ...
  Topic: confused about CFX-meshing error message
zhang.li

Replies: 2
Views: 3645

PostForum: XANSYS   Posted: Wed Nov 04, 2009 2:34 am   Subject: Re: [Xansys] confused about CFX-meshing error message



Hi Ugo, thanks for your reply.

i have not applied Face Spacings on any area. Just using the Default Face Spacing applied.

could it be anything else please?

Regards,
Li ZHANG
Beijing J ...
  Topic: confused about CFX-meshing error message
zhang.li

Replies: 2
Views: 3645

PostForum: XANSYS   Posted: Wed Nov 04, 2009 1:23 am   Subject: confused about CFX-meshing error message
Hi all,

I defined a region in CFX-mesh called 'wall', and these areas defining the region 'wall' will have inflation applied.

an error from CFX-mesh is below:
The location
wall
refers to 12 p ...
  Topic: [Xansys] [WB][CFX]Fluid-Thermal analysis steps need verif
zhang.li

Replies: 8
Views: 15993

PostForum: XANSYS   Posted: Tue Nov 03, 2009 8:07 pm   Subject: Re: [Xansys] [WB][CFX]Fluid-Thermal analysis steps need v
Dear Shailendra,

Thanks a lot for your reply. Sorry for my late response here.

i have a few enquiries if i may, and hope you can help me out again.

1) in the Conjugate heat transfer tutorial ...
  Topic: CFX-meshing enquiry
zhang.li

Replies: 2
Views: 1997

PostForum: XANSYS   Posted: Tue Nov 03, 2009 2:31 am   Subject: CFX-meshing enquiry
Hi again,

When i have a circle tangent to a line, CFX mesh produces errors at the region where the circle and line meets, suggesting me to reduce the mesh spacing further when i'm using a constant ...
  Topic: CFX-Workbench error message
zhang.li

Replies: 1
Views: 2450

PostForum: XANSYS   Posted: Tue Nov 03, 2009 1:12 am   Subject: CFX-Workbench error message
Hi all,

I encountered a problem while importing CFX-Convection into a Transient Thermal analysis. The error message below appeared:

An error occurred while transferring loads/supports/contacts: ...
  Topic: thermal analysis BC
zhang.li

Replies: 4
Views: 5188

PostForum: XANSYS   Posted: Sat Oct 31, 2009 10:15 pm   Subject: thermal analysis BC
Dear all,

In a thermal analysis, if i don't assign any thermal load/boundary condition to a surface, will ANSYS regard it as perfectly insulated please?

how did ANSYS compute the film coefficien ...
  Topic: CFX-meshing machine-dependent?
zhang.li

Replies: 2
Views: 2845

PostForum: XANSYS   Posted: Fri Oct 30, 2009 12:58 am   Subject: Re: AW: [Xansys] CFX-meshing machine-dependent?
[quote="rolf.johannes"]Hi,
what were the OS and processor architecture the same? I experienced the same with Ansys when switching between 32bit and 64bit or from Intel to AMD based machines ...
  Topic: CFX-meshing machine-dependent?
zhang.li

Replies: 2
Views: 2845

PostForum: XANSYS   Posted: Fri Oct 30, 2009 12:33 am   Subject: CFX-meshing machine-dependent?
Dear all,

i've experienced something odd (to me) while using CFX-Meshing.

On one machine, it produces errors and warnings, claiming that at a certain area in my model, the element angle or some ...
  Topic: CFRP Analysis
zhang.li

Replies: 59
Views: 100831

PostForum: XANSYS   Posted: Mon Oct 19, 2009 6:19 pm   Subject: CFRP Analysis
dear Horace,

what do you exactly need help on please?

regards,
Li
beijing jiaotong university
  Topic: text inconsistency in help file
zhang.li

Replies: 1
Views: 1937

PostForum: XANSYS   Posted: Thu Oct 15, 2009 12:44 am   Subject: text inconsistency in help file
Hi all,

There seem to be some inconsistency in the text of the Workbench help file version 11.

Under Convection, it mentions of bulk fluid temperature and face temperature. But in the Workbench ...
  Topic: rotor mass unbalance
zhang.li

Replies: 16
Views: 17167

PostForum: XANSYS   Posted: Wed Oct 14, 2009 7:14 am   Subject: Re: [Xansys] rotor mass unbalance
[quote="gregory.banyay"].....
ANSYS WB12 has a real nice rotordynamics analysis guide. Over the past few weeks I've been trying to study it and the ANSYS tech support folks have
also been ...
  Topic: rotor mass unbalance
zhang.li

Replies: 16
Views: 17167

PostForum: XANSYS   Posted: Tue Oct 13, 2009 5:21 pm   Subject: Re: [Xansys] rotor mass unbalance
Joseph Metrisin,

thank you for your comments.

Am i correct to understand that, if i were to perform a 3D harmonic analysis on my model with the unbalanced mass, i can study the stress due to unb ...
  Topic: rotor mass unbalance
zhang.li

Replies: 16
Views: 17167

PostForum: XANSYS   Posted: Tue Oct 13, 2009 7:48 am   Subject: Re: [Xansys] rotor mass unbalance
Hi Josepth Metrisin, thanks again for your prompt reply.

To answer your question, I've mentioned that i would like to study the stress due to centrifugal force considering an unbalance mass on a ro ...
  Topic: rotor mass unbalance
zhang.li

Replies: 16
Views: 17167

PostForum: XANSYS   Posted: Tue Oct 13, 2009 5:44 am   Subject: Re: [Xansys] rotor mass unbalance
Hi Joseph Metrisin,

THanks again for your comments.

So, even if i want to simplify my modeling to study the stress due to an unbalance mass on a rotor, i still need to perform it in 3D following ...
  Topic: rotor mass unbalance
zhang.li

Replies: 16
Views: 17167

PostForum: XANSYS   Posted: Mon Oct 12, 2009 5:53 pm   Subject: Re: [Xansys] rotor mass unbalance
Hi Joseph Metrisin,

Hello again, thank you for your reply and comments.

I missed your point earlier on the explicit element which i overlooked in the help file sorry....

So then, would it app ...
  Topic: rotor mass unbalance
zhang.li

Replies: 16
Views: 17167

PostForum: XANSYS   Posted: Mon Oct 12, 2009 7:56 am   Subject: Re: [Xansys] rotor mass unbalance
hi Joseph Metrisin, thank you very much for your reply below.

Actually, i am not using axisymmetric model. it is an in-plane model which symmetrical in the circumferential direction, one-8th of th ...
  Topic: rotor mass unbalance
zhang.li

Replies: 16
Views: 17167

PostForum: XANSYS   Posted: Mon Oct 12, 2009 2:18 am   Subject: rotor mass unbalance
Hi all,

I'm trying to perform a 2D rotor stress analysis due to centrifugal force at a certain operating rotational speed. Now, i would like to consider unbalance mass on the rotor.

Can i impose ...
  Topic: exporting New material to existing material file
zhang.li

Replies: 1
Views: 2018

PostForum: XANSYS   Posted: Sat Oct 10, 2009 2:53 am   Subject: exporting New material to existing material file
Dear all,

I've input some new parameters to create a new material in WB v11, and would like to export it into an existing material library. But, exporting process is taking a very long time...... e ...
  Topic: [WB][CFX]Fluid-Thermal analysis steps need verificatio
zhang.li

Replies: 1
Views: 2104

PostForum: XANSYS   Posted: Fri Oct 09, 2009 10:44 pm   Subject: WB][CFX]Fluid-Thermal analysis steps need verification
Dear Shailendra Singh,

Thank you so much for your reply and comments.

With regards to the issue of energy imbalances, it has always occurred to me on this particular analysis that the RMS residu ...
  Topic: [WB][CFX]Fluid-Thermal analysis steps need verification...
zhang.li

Replies: 4
Views: 5750

PostForum: XANSYS   Posted: Sun Sep 27, 2009 11:09 pm   Subject: WB][CFX]Fluid-Thermal analysis steps need verification...
one other question:

if the heat loss is changed, do i still need to recalculate the CFX convection film coefficient using the modified heat loss please?

Li ZHANG
Beijing Jiaotong University
  Topic: [WB][CFX]Fluid-Thermal analysis steps need verification...
zhang.li

Replies: 4
Views: 5750

PostForum: XANSYS   Posted: Sat Sep 26, 2009 5:33 pm   Subject: [WB][CFX]Fluid-Thermal analysis steps need verification...
The convection I mentioned, I think it is the film coefficient that CFX has computed based on my fluid flowrate, surface temperatures, and fluid inlet temperature. I've not given any bulk temperature ...
  Topic: [WB][CFX]Fluid-Thermal analysis steps need verification...
zhang.li

Replies: 4
Views: 5750

PostForum: XANSYS   Posted: Fri Sep 25, 2009 7:14 am   Subject: [WB][CFX]Fluid-Thermal analysis steps need verification...
Dear all,
I intend to perform a fluid-thermal analysis on an electrical machine inside an aluminium housing with water-cooling channels within the housing. The model consists of: 1) housing with wate ...
  Topic: performing interference fit contact analysis
zhang.li

Replies: 22
Views: 35057

PostForum: XANSYS   Posted: Wed Sep 16, 2009 7:20 am   Subject: Re: [Xansys] performing interference fit contact analysis
There's a tip document entitled 'Principle of simulating contacts between parts using ANSYS' written by David Penn, where the document mentions that '.... start contact analysis with a small FKN value ...
  Topic: [CFX/Thermal/Struc]
zhang.li

Replies: 2
Views: 8779

PostForum: XANSYS   Posted: Tue Sep 15, 2009 12:12 am   Subject: Re: [CFX/Thermal/Struc]
I've met this problem before.... but maybe it would be a start to check if you've choosen the correct faces where your CFX Temperature are applied to.

also, make sure your CFX Mesh and the mesh in ...
  Topic: receiving mail delivery fail message after post
zhang.li

Replies: 2
Views: 3258

PostForum: XANSYS   Posted: Mon Sep 14, 2009 10:33 pm   Subject: receiving mail delivery fail message after post
I've been receiving an email with the subject 'failure notice', where it alleges that i intend to send my post here in XANSYS to an email address :

04115235@bjtu.edu.cn

why is this happening pl ...
  Topic: Thermal-Structural analysis
zhang.li

Replies: 2
Views: 2753

PostForum: XANSYS   Posted: Mon Sep 14, 2009 10:24 pm   Subject: Re: [Xansys] Thermal-Structural analysis
[quote="paris.altidis"]Zhang,
The Temperatures need to be mapped on the structural model and applied as body loads (See BF command). Having said that, how did you map the pressures anyway ...
  Topic: Thermal-Structural analysis
zhang.li

Replies: 2
Views: 2753

PostForum: XANSYS   Posted: Mon Sep 14, 2009 8:47 pm   Subject: Thermal-Structural analysis
Dear all,

How can i use CFX Temperature results to perform a static structural analysis to study the deformation due to temperature rise please?

I'm able to perform a static structural analysis ...
  Topic: performing interference fit contact analysis
zhang.li

Replies: 22
Views: 35057

PostForum: XANSYS   Posted: Thu Sep 10, 2009 1:19 am   Subject: Re: [Xansys] performing interference fit contact analysis
[quote="andrew.sims"]
What are you trying to do? Chris' response explains this well.
[/quote]

Dear Andrew Sims,

thanks for your reply. my original problem is posted in the first post ...
  Topic: performing interference fit contact analysis
zhang.li

Replies: 22
Views: 35057

PostForum: XANSYS   Posted: Wed Sep 09, 2009 10:36 pm   Subject: confused between 2 contact tutorials...
Hi all,

Referring to the Contact Tutorial for ANSYS Classics entitled 'Interference Fit and Pin Pull-Out Contact Analysis' and a tutorial found from ANSYS WB help, DSVM25 entitled 'Stresses Due to ...
  Topic: performing interference fit contact analysis
zhang.li

Replies: 22
Views: 35057

PostForum: XANSYS   Posted: Wed Sep 09, 2009 6:55 pm   Subject: Re: ***SUSPECT*** RE: [Xansys] performing interference fit c
Hi Fern,

Thank you for your response.

you mentioned that:......I've now got into the habit of doing an EKILL on the weak springs after contacts have "seated"....

Q1) what do you mea ...
  Topic: [Xansys] performing interference fit contact analysis
zhang.li

Replies: 7
Views: 10825

PostForum: XANSYS   Posted: Tue Sep 08, 2009 6:19 pm   Subject: Re: ***SUSPECT*** Re: [Xansys] performing interference fit c
[quote="keith.technologies"]I would suggest running the analysis using elastic-plastic material properties and ramping the interference on over at least 20 substeps. This will smear out the ...
  Topic: [Xansys] performing interference fit contact analysis
zhang.li

Replies: 7
Views: 10825

PostForum: XANSYS   Posted: Fri Sep 04, 2009 9:25 pm   Subject: Re: [Xansys] performing interference fit contact analysis


thank you all for your feedback. but sometimes, i can't really understand the essence of the advice.

in one way, some are saying my interference fit exercise using ANSYS is trivial and might as ...
  Topic: performing interference fit contact analysis
zhang.li

Replies: 22
Views: 35057

PostForum: XANSYS   Posted: Fri Sep 04, 2009 6:20 am   Subject: Re: [Xansys] performing interference fit contact analysis


Thanks Vik for your reply and recommendation.

in fact, this model i have has NO SYMMETRY BCs applied, since i've used the ENTIRE cylindrical geometry rather than just a fraction of the model. j ...
  Topic: performing interference fit contact analysis
zhang.li

Replies: 22
Views: 35057

PostForum: XANSYS   Posted: Fri Sep 04, 2009 1:51 am   Subject: Re: [Xansys] performing interference fit contact analysis
[quote="Martin Liddle"]In message <--email address suppressed-->, zhang.li
<--email address suppressed--> writes
>
>I've mentioned that i have a fixed support in the in ...
  Topic: performing interference fit contact analysis
zhang.li

Replies: 22
Views: 35057

PostForum: XANSYS   Posted: Fri Sep 04, 2009 12:48 am   Subject: Re: [Xansys] assigning pinball region for contact analysis
[quote="james.wolford"]There is a closed form solution for this problem and it can be
accurately modeled (if it needs to be in 2D). Check your stress value
to the closed form solution. I ...
  Topic: performing interference fit contact analysis
zhang.li

Replies: 22
Views: 35057

PostForum: XANSYS   Posted: Thu Sep 03, 2009 8:34 pm   Subject: performing interference fit contact analysis
Dear all,

i am trying to learn how to simulate static stress analysis considering interference fit. i am using a simplified model of 2 hollow cylinders, CYLA (1045 steel,530MPa yield) and CYLB (M15 ...
  Topic: interference fit setup
zhang.li

Replies: 0
Views: 1316

PostForum: XANSYS   Posted: Wed Sep 02, 2009 2:51 am   Subject: interference fit setup
Dear all,

in ANSYS WB v11 i have seen an example where i implement the interference fit between 2 components in the imported geometry assembly.

Can i set the "Add Offset value, No Ramp" ...
  Topic: Moment off center of cylindrical face
zhang.li

Replies: 0
Views: 1241

PostForum: XANSYS   Posted: Thu Aug 20, 2009 9:37 pm   Subject: Moment off center of cylindrical face
Dear all,

i'm encountering another problem while applying a moment on a cylindrical geometry face in ANSYS WB v11.

My imported 3D model is centered at the Global coordinate system, and the cylin ...
  Topic: CFX mesh error msgs
zhang.li

Replies: 2
Views: 3015

PostForum: XANSYS   Posted: Thu Aug 20, 2009 5:57 pm   Subject: Re: [Xansys] CFX error msg:Critical Error Occurred


Dear Edmund,

Thank you for your response and enquiry.

I'm using ANSYS WB v11 on Windows Vista

Regards,
Li ZHANG
Beijing Jiaotong University
  Topic: CFX mesh error msgs
zhang.li

Replies: 2
Views: 3015

PostForum: XANSYS   Posted: Wed Aug 19, 2009 11:28 pm   Subject: CFX mesh error msgs
Dear all,

I'm encountering a weird problem while using CFX meshing.

Each time i go into the Tree Item to set a certain parameter, a dialog box with the message 'Critical Error Occurred' pops up ...
  Topic: Bolt prestress setup procedure
zhang.li

Replies: 20
Views: 32394

PostForum: XANSYS   Posted: Mon Aug 17, 2009 2:11 am   Subject: Re: [Xansys] Bolt prestress setup procedure
Dear Paris Altidis,

Thank you for your comments and suggestions here. and i would like to make a few enquiries about your suggestions.

From your msg:

.............Apply the pretension in two ...
  Topic: Bolt prestress setup procedure
zhang.li

Replies: 20
Views: 32394

PostForum: XANSYS   Posted: Mon Aug 17, 2009 1:08 am   Subject: clarity of objective...
Dear all,

in response to Chris' early enquiry about my objective, i would like to say that, my eventual objective is to find out the change in frequency from modal analysis due to different bolt pr ...
  Topic: Bolt prestress setup procedure
zhang.li

Replies: 20
Views: 32394

PostForum: XANSYS   Posted: Sun Aug 16, 2009 12:02 am   Subject: clarify geometry...
Dear all,

Thank you all so much for your replies and thoughts and comments. I suppose, the most confusing part might be the reasons and how my geometry really looks like.

i'll attempt to give a ...
  Topic: Bolt prestress setup procedure
zhang.li

Replies: 20
Views: 32394

PostForum: XANSYS   Posted: Fri Aug 14, 2009 9:04 pm   Subject: Bolt prestress setup procedure
Dear all,

Hello, the name is Li. Thank you Moderator for approving my registration and giving me the opportunity to post my enquiries and also to share my experiences in ANSYS WB v11.

here i hav ...
 
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