Dear
I am trying to mesh a geometry which consists of three different domains (External, Medium and Internal ) and want to draw mesh convergence plot of my geometry to identify at what mesh property it converges. Medium domain is suppose to be sensitive that's why It must be mesh very finely. I tried tetrahedral mesh at each domain separably. Also I tried Triangular mesh with swept command. For 3D how can I draw convergence curve, I don't have any idea. Although I watched videos as well but did not find any particular method to do so. Using parametric sweep I sweep the element size of mesh and plot one of eigenfrequency corresponding to sweeping mesh elements/ Result obtained is shown in attached file. It shows from extreme coarser mesh till Normal it convergences which is not correct and at fine mesh results are deviating alot specially at extremely fine mesh. I want to draw a convergence curve for my geometry in COMSOL. If anyone has idea, Please comment
Thank you for your support.
I agree with Yequing Wang. You go on refining the mesh till the results of the simulations have less difference for example 15% difference. At this stage you can stop meshing because the results have little difference.
Dear Yeqing Wang and Arshiya A. Khan,
Thank you for your response. I tried that manual calculation method but even till extremely fine mesh I did not get good convergence. I double checked my mesh as well. Mesh must not be the problem.
I read few COMSOL blogs, they mentioned that COMSOL can calculate the convergence curve by sweeping the mesh size. I know how to do for 2D but for 3D, I am not getting correct result. I believe, my procedure might be having some problem.
If anyone has idea, please comment.
Thank you
Hi Muhammad,
Can you please show us the method of finding the mesh convergence element size for 2D.
Thank you
Start from coarse meshing and then make it finer and finer until your solution becomes nearly the same for two consecutive simulations. Line plot will be manual for each simulation you can check number elements from mesh statics. Then make a line plot for number of elements in mesh versus the parameter like in your case its frequency. This procedure for optimal mesh selection. Optimal mesh is the mesh with desired accuracy of results and minim computational cost. For more detail my publication will help you.
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