Simplefoam runs using the same mesh

Openfoam5555 · April 28, 2021, 20:48

I have a model that I want to run with various inlet and outlet conditions using simplefoam. Instead of re-meshing for each different boundary condition, can I re-use the same snappyhexmesh generated mesh and just change the boundary conditions and re-run?

It seems like this should be simple, but I'm missing something.

Thanks!

Roman1 · April 29, 2021, 01:34

Just change BC by hands and restart. If you use parallel running first start snappyHexMesh (after blockMesh of course) second decomposeParDict. Having changed BC (only in the "0" folder) run decomposeParDict again and run the solve.

Openfoam5555 · April 29, 2021, 10:34

Hey Roman,

Thanks. I'm trying to avoid having to re-run snappyhexmesh as that takes a significant amount of time. And if I'm only changing velocity and/or pressure I don't think that should be necessary. Is there a way to just restart the simulation after changing the BC and without re-running the mesh?

Thanks!

April 28, 2021, 20:48	Simplefoam runs using the same mesh	#1
Openfoam5555 New Member anonymous Join Date: Jul 2020 Posts: 5 Rep Power: 5	I have a model that I want to run with various inlet and outlet conditions using simplefoam. Instead of re-meshing for each different boundary condition, can I re-use the same snappyhexmesh generated mesh and just change the boundary conditions and re-run? It seems like this should be simple, but I'm missing something. Thanks!

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April 29, 2021, 01:34		#2
Roman1 Member Roman Join Date: Sep 2013 Posts: 83 Rep Power: 12	Just change BC by hands and restart. If you use parallel running first start snappyHexMesh (after blockMesh of course) second decomposeParDict. Having changed BC (only in the "0" folder) run decomposeParDict again and run the solve.

April 29, 2021, 10:34		#3
Openfoam5555 New Member anonymous Join Date: Jul 2020 Posts: 5 Rep Power: 5	Hey Roman, Thanks. I'm trying to avoid having to re-run snappyhexmesh as that takes a significant amount of time. And if I'm only changing velocity and/or pressure I don't think that should be necessary. Is there a way to just restart the simulation after changing the BC and without re-running the mesh? Thanks!