I am simulating boiling flow with CFX. I want to make mesh sensivitiy study. The problem is that for coarse mesh the solution is converginig. As I do finer mesh I am getting trouble. It is not converging. What should I do? (I am always keeping y plus more than 30)
Thank you very much
if the mesh have a concentration of grid points in a specific region (toward the walls) may be leads the diverge. you can decreased the concentration without decreased the mesh size to get converge solution.
If you have a finer mesh you should reduce the time step in order to maintain constant the Courant number.
Franco
Ensure that your cell size near the wall is bigger than the departure diameter of the bubble
Hello Sibel Tas, apparently I'm doing the boiling simulation too and finally, I can extract some results. Unfortunately, my problem is with the mesh independent study.
I have no problem when I increase the mesh, but suddenly it got diverged easily when I change the mesh into the coarser one. Do you know what happen to my case? Any supports is highly appreciated.
Thanks
Hi Luthfi Ady Farizan Haryoko
First I have to say that mesh independent study is not easy for two phase flow. How do you do mesh study? Do you just decrease the mesh size in the bulk ? Do you solve boundary layer? It is mono or poly approach?
I could say according to my experience, there is a relationship between bubble size and mesh size.
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