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OpenFOAM stress analysis results are showing 8-10% error with analytical solution. |
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September 10, 2012, 12:52 |
OpenFOAM stress analysis results are showing 8-10% error with analytical solution.
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#1 |
Member
Sangeeta
Join Date: Jul 2012
Location: Kingston, Canada
Posts: 70
Rep Power: 14 |
Hello everyone,
I am running solidDisplacementFoam problem for thermal stress analysis. My solution is converged but not showing good agreement with analytical solution. Simulation results shows 8-10% error with analytical solution. Does 8-10% error is fine for solid problems? Has anybody an idea? Regards, Sangeeta |
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September 10, 2012, 14:32 |
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#2 |
Super Moderator
Philip Cardiff
Join Date: Mar 2009
Location: Dublin, Ireland
Posts: 1,091
Rep Power: 34 |
Hi Sangeeta,
I presume you are referring to the "hollow cylinder with internal temperature" case as described by Timoshenko, Theory of Elasticity. I tried this case and I found that the errors become very small (much much less than 1%) as you refine the mesh. I have attached an graph showing a comparison between the results from a coarse and fine mesh. To answer your question about "is 8-10% error ok?", in general for solid mechanics, it depends on the assumptions made in the analytical solutions (and in the numerical model). But for relatively straight-forward linear elastic and thermal elastic, the results should be very close to the analytical, especially as the mesh is refined. Hope it helps, Philip |
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September 10, 2012, 15:06 |
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#3 | |
Member
Sangeeta
Join Date: Jul 2012
Location: Kingston, Canada
Posts: 70
Rep Power: 14 |
Quote:
Thanks a lot for the reply. Actually here I am solving another problem of thermal stresses for OpenFOAM validation. This problem is given in Timoshenko (page no. 399). This is for a rectangular plate. I am going to email this case to you. Thanks, Sangeeta |
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May 5, 2017, 11:39 |
hollow cylinder with internal temperature
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#4 |
New Member
Guido Lupieri
Join Date: Sep 2011
Posts: 3
Rep Power: 15 |
hello
I have tried to resolve the problem of the title, that is also a case of the tutorial, by subjecting the 2D cylinder to the following boundary conditions: for temperature T=100 in the hollow and T=0 at the outer patch, for displacement D=0 tractionDisplacement (traction and pressure). The results looks not as accurate as the ones of Dr. Cardiff/analytical case that I have seen in this forum, even if I try to refine the grid. Did somebody try the same tutorial case recently? Thanks Cheers Guido |
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