- **OpenFOAM**
(*https://www.cfd-online.com/Forums/openfoam/*)

- - **OpenFOAM stress analysis results are showing 8-10% error with analytical solution.**
(*https://www.cfd-online.com/Forums/openfoam/106836-openfoam-stress-analysis-results-showing-8-10-error-analytical-solution.html*)

OpenFOAM stress analysis results are showing 8-10% error with analytical solution.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 |

1 Attachment(s)
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 |

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 |

All times are GMT -4. The time now is 13:40. |