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Structural-magnetic coupled contact
 
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yunxin.gao
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Joined: 23 Aug 2011
Posts: 3

PostPosted: Fri Aug 26, 2011 1:01 am  Reply with quote

Hello

I am trying to solve a structure-magnetic coupled problem with contact pairs by directly-coupled method. Any advice on the information on coupled contact elements or how to simulate the contact interface for magnetic DOFs is greatly appreciated.
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Dr. Yunxin GAO
Siemens Magnet Technology
Oxon, UK
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Martin Liddle
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Joined: 15 Aug 2008
Posts: 1274
Location: Chesterfield, UK

PostPosted: Fri Aug 26, 2011 2:47 am  Reply with quote

On 26/08/2011 09:01, yunxin.gao wrote:
Quote:

I am trying to solve a structure-magnetic coupled problem with contact pairs by directly-coupled method. Any advice on the information on coupled contact elements or how to simulate the contact interface for magnetic DOFs is greatly appreciated.

Which magnetic element types are you using? I have in the past used
couples (CP command) and constraint equations (CEINTF command) with
SOLID96 and SOLID97. CONTA172 and CONTA173 support magnetic contact
coupling if a scalar potential formulation is being used; see section
7.3 of the Contact Technology guide for Mechanical APDL. Not sure what
is possible with SOLID117 or SOLID236. Hopefully Mike Yaksh will pop up
and enlighten us.

--
Martin Liddle, Tynemouth Computer Services,
Chesterfield, Derbyshire, UK.
www.tynecomp.co.uk

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Martin Liddle, Tynemouth Computer Services,
Chesterfield, UK.
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mike.yaksh
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Joined: 05 Feb 2009
Posts: 291

PostPosted: Fri Aug 26, 2011 8:29 am  Reply with quote

Yunxin

I use constraint equations for cases like when I want to offset the rotor from the centerline in the radial direction. In that case, I solve the structural problem in which the air has a low modulus, and the mesh is allowed to deform. If you are doing a 2D model, you can also use the conta171. If this is a 3D model, and you are using the scalar formulation (solid96) you can use the conta173. If this is 3D and you are using the 236, then you can use the approach descibed in the first sentence in which you solve the structural model, then use UPCOOR to move the nodes for the magnetics model and use constraint equations to join the model.

Is this 2D or 3D problem? Can you describe the problem?

Mike Yaksh, PhD
NAC International
Norcross GA

________________________________________
From: xansys-bounces@xansys.org [xansys-bounces@xansys.org] On Behalf Of yunxin.gao [yunxin.gao@siemens.com]
Sent: Friday, August 26, 2011 3:01 AM
To: xansys@xansys.org
Subject: [Xansys] Structural-magnetic coupled contact

Hello

I am trying to solve a structure-magnetic coupled problem with contact pairs by directly-coupled method. Any advice on the information on coupled contact elements or how to simulate the contact interface for magnetic DOFs is greatly appreciated.

------------------------
Dr. Yunxin GAO
Siemens Magnet Technology
Oxon, UK






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yunxin.gao
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Joined: 23 Aug 2011
Posts: 3

PostPosted: Wed Aug 31, 2011 7:52 am  Reply with quote

Hello,

Thanks a lot for your reply and helpful information. I used plane13 in 2D model and solid62 for 3D (current density applied) and solid97 and infin111 for air domains.

The problem is on the contact interfaces. Do you means that using constraint equations on the magnetic potentials DoFs to make them continuous on the contact surfaces?

Thanks and regards
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Dr. Yunxin GAO
Siemens Magnet Technology
Oxon, UK
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mike.yaksh
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Joined: 05 Feb 2009
Posts: 291

PostPosted: Wed Aug 31, 2011 1:08 pm  Reply with quote

Yunxin,

The contact elements only support the MAG dof for the scalar formulation. If the 62 is to be used, then constraint equations are needed to allow the AX,AY,AZ to be connected across the interface. The main issue with the 62 is that it uses the MVP (AX,AY,AZ) which does not do well at the iron-air interfaces without some extra modeling. (Iron in the sense that the MURX >1). You need to describe your problem a little more to determine if deformation is important or just some type of rigid body motion.

Mike Yaksh, PhD
NAC International
Norcross GA

-----Original Message-----
From: xansys-bounces@xansys.org [mailto:xansys-bounces@xansys.org] On Behalf Of yunxin.gao
Sent: Wednesday, August 31, 2011 10:52 AM
To: xansys@xansys.org
Subject: Re: [Xansys] Structural-magnetic coupled contact

Hello,

Thanks a lot for your reply and helpful information. I used plane13 in 2D model and solid62 for 3D (current density applied) and solid97 and infin111 for air domains.

The problem is on the contact interfaces. Do you means that using constraint equations on the magnetic potentials DoFs to make them continuous on the contact surfaces?

Thanks and regards

------------------------
Dr. Yunxin GAO
Siemens Magnet Technology
Oxon, UK






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| XANSYS web - www.xansys.org/forum |
| The Online Community for users of ANSYS, Inc. Software |
| Hosted by PADT - www.padtinc.com |
| Send administrative requests to xansys-mod@tynecomp.co.uk |
+-------------------------------------------------------------+

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