buoyantPimpleFoam blows up on large scale simulations

sharonyue · April 18, 2023, 09:28

These days I found buoyantPimpleFoam is not stable for large scale simulations (like ABL). Please see attachment for the test case (run buoyantFoam directly by openfoam-10, or buoyantPimpleFoam by openfoam-9 and lower), which is pretty simple. What I simulate is a rectangle box (2.2km high) with left inlet and right outlet. It easily blows up after several seconds.

If we scale it 1000 times smaller. Everything is fine.

I would be happy to hear your suggestions :-)

sharonyue · April 20, 2023, 03:04

Alright. I did lots of test. I found the old version bouyantBoussinesqPimpleFoam is stabler than the new bouyantPimpleFoam. Right now I transport bouyantBoussinesqPimpleFoam from openfoam-6 to openfoam-9. Everything works fine.

April 20, 2023, 03:04		#2
sharonyue Senior Member Dongyue Li Join Date: Jun 2012 Location: Beijing, China Posts: 848 Rep Power: 18	Alright. I did lots of test. I found the old version bouyantBoussinesqPimpleFoam is stabler than the new bouyantPimpleFoam. Right now I transport bouyantBoussinesqPimpleFoam from openfoam-6 to openfoam-9. Everything works fine. __________________ My OpenFOAM algorithm website: http://dyfluid.com By far the largest Chinese CFD-based forum: http://www.cfd-china.com/category/6/openfoam We provide lots of clusters to Chinese customers, and we are considering to do business overseas: http://dyfluid.com/DMCmodel.html

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