very fine Mesh + interFoam (VOF) + dynamicMesh (rotatingMotion)

cyss38 · September 29, 2022, 14:09

Hi everyone,

When i use a very fine Mesh + interFoam (VOF) + dynamicMesh (rotatingMotion), i have a strange behaviour near the walls (in the rotating zone). Indeed, on the first layers near the wall, i have alpha not equal to 1 (when it should be)... And so the force on the walls is not good.

I tested lot of things (very low CFL, different schemes and numerical parameters) but without success.

With a coarser mesh, there is no problem... and with no rotating too

Do you have an explanation and a trick to avoid that ?

Thanks a lot

Cyrille

arjun · September 30, 2022, 03:08

Mass imbalance in these cells is not satisfied so it can act as source or sink for volume fraction.

The aspect ratio is not very good so it can cause it.

September 29, 2022, 14:09	very fine Mesh + interFoam (VOF) + dynamicMesh (rotatingMotion)	#1
cyss38 Member Cyrille Bonamy Join Date: Mar 2015 Location: Grenoble, France Posts: 86 Rep Power: 11	Hi everyone, When i use a very fine Mesh + interFoam (VOF) + dynamicMesh (rotatingMotion), i have a strange behaviour near the walls (in the rotating zone). Indeed, on the first layers near the wall, i have alpha not equal to 1 (when it should be)... And so the force on the walls is not good. I tested lot of things (very low CFL, different schemes and numerical parameters) but without success. With a coarser mesh, there is no problem... and with no rotating too Do you have an explanation and a trick to avoid that ? Thanks a lot Cyrille

September 30, 2022, 03:08		#2
arjun Senior Member Arjun Join Date: Mar 2009 Location: Nurenberg, Germany Posts: 1,286 Rep Power: 34	Mass imbalance in these cells is not satisfied so it can act as source or sink for volume fraction. The aspect ratio is not very good so it can cause it. cyss38 likes this.

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