[Commercial meshers] Errors Converting Mesh From Star CCM+

Aerommr · December 16, 2020, 05:58

Hello all, I'm new here. Looking around I haven't found any solution, therefore I'm writing here hoping someone can help me.

I converted a mesh .ccm from Star to OpenFOAM with ccm26ToFoam. Running chechMesh I obtain some errors which are not present on Star. When I run the simulation with first-order accuracy it is fine, but when I set second-order accuracy for velocity it crashes after few iterations. Therefore there could be some problems to be solved in the mesh to run it properly.

Can someone help me to figure out how to solve some of the most important problems?

I'm attaching a Screenshot about checkMesh.

olesen · December 18, 2020, 06:06

Run various mesh checks within STARCCM+ first (sorry can't remember any more which ones) to ensure that you have a reasonably decent mesh quality. The STARCCM+ solver will accept (and ignore) many bad cells that OpenFOAM will not like.
You should also use ccmToFoam (in the openfoam.com version), it has a number of changes that are useful.

Aerommr · December 18, 2020, 17:02

Hi, thank you for your reply. I ran mesh checks on star and everything looked fine. I use OpenFoam v8, the one downloaded from openfoam.org, but it doesn't have ccmtofoam. I tried to install this command, but I couldn't able to do that.

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December 18, 2020, 06:06		#2
olesen Senior Member Mark Olesen Join Date: Mar 2009 Location: https://olesenm.github.io/ Posts: 1,686 Rep Power: 40	Run various mesh checks within STARCCM+ first (sorry can't remember any more which ones) to ensure that you have a reasonably decent mesh quality. The STARCCM+ solver will accept (and ignore) many bad cells that OpenFOAM will not like. You should also use ccmToFoam (in the openfoam.com version), it has a number of changes that are useful.

December 18, 2020, 17:02		#3
Aerommr New Member Luigi Join Date: Dec 2020 Posts: 2 Rep Power: 0	Hi, thank you for your reply. I ran mesh checks on star and everything looked fine. I use OpenFoam v8, the one downloaded from openfoam.org, but it doesn't have ccmtofoam. I tried to install this command, but I couldn't able to do that.