Contact problem (boundary condition) for stress analysis

Hisham · September 20, 2011, 09:29

Dear Foamers,

In the paper "Finite Volume Methodology for Contact Problems of Linear Elastic Solids" by Jasak and Weller (2000), it seems there exists a BC for the contact problem in linear elastic stress analysis.

I wonder if this BC can be found by default in OF (I searched the derived BCs folder but none seems to have a representative name of the problem). If not, how can one obtain such BC?

Best regards,
Hisham

bigphil · September 21, 2011, 04:55

Hi Hisham,

Quote:

In the paper "Finite Volume Methodology for Contact Problems of Linear Elastic Solids" by Jasak and Weller (2000), it seems there exists a BC for the contact problem in linear elastic stress analysis.

This paper refers to a solver that was written for FOAM (predecessor of OpenFOAM) and it now resides in the OpenFOAM Extend branch (i.e. OpenFOAM-1.6-ext).

You can find it in $FOAM_SOLVERS/newStressAnalysis/newContactStressFoam.

However this solver does not work correctly anymore.
I am working on a different contact stress solver as part of my PhD and it works better (OpenFOAM Workshop Presentation and Abstract). It still has some bugs but gives good results.

I can send you my latest solver and a test case if you like (just private mail me your email address)? Some time over the next year I will probably tidy up this solver and it can be put into OpenFOAM Extend and the older non-working one can be removed.

Philip

Hisham · September 21, 2011, 06:56

Hi Philip,

It is great to know you're working on that problem. I will take a look at the OpenFOAM-extend first to understand the FOAM approach to contact.

My simulations involve soil-structure interaction, for which (my simulations) the contact problem is not of utmost significance. I can somehow define a weaker soil-zone (very thin) around the structure. It is usually done in FEM codes by considering elements of zero lengths with reduced material properties.

Nevertheless, I take great interest in updates about the contact problem.

Not to cause you so much trouble as things do not seem straightforward with contact in OF. I will let you know after I get my solver running so I may implement your contact segments in it. In the time being, I guess I'll delay focus on the frictional contact of soil-structure.

Thanks and best regards,
Hisham El Safti

September 20, 2011, 09:29	Contact problem (boundary condition) for stress analysis	#1
Hisham Senior Member Hisham Elsafti Join Date: Apr 2011 Location: Braunschweig, Germany Posts: 257 Blog Entries: 10 Rep Power: 17	Dear Foamers, In the paper "Finite Volume Methodology for Contact Problems of Linear Elastic Solids" by Jasak and Weller (2000), it seems there exists a BC for the contact problem in linear elastic stress analysis. I wonder if this BC can be found by default in OF (I searched the derived BCs folder but none seems to have a representative name of the problem). If not, how can one obtain such BC? Best regards, Hisham

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September 21, 2011, 06:56		#3
Hisham Senior Member Hisham Elsafti Join Date: Apr 2011 Location: Braunschweig, Germany Posts: 257 Blog Entries: 10 Rep Power: 17	Hi Philip, It is great to know you're working on that problem. I will take a look at the OpenFOAM-extend first to understand the FOAM approach to contact. My simulations involve soil-structure interaction, for which (my simulations) the contact problem is not of utmost significance. I can somehow define a weaker soil-zone (very thin) around the structure. It is usually done in FEM codes by considering elements of zero lengths with reduced material properties. Nevertheless, I take great interest in updates about the contact problem. Not to cause you so much trouble as things do not seem straightforward with contact in OF. I will let you know after I get my solver running so I may implement your contact segments in it. In the time being, I guess I'll delay focus on the frictional contact of soil-structure. Thanks and best regards, Hisham El Safti