csf models couple with dynamic mesh

OtisChen · June 21, 2020, 23:13

Dear all:

I was studying a question which needs to couple with CSF model(to calculate surface tension) with dynamic mesh in two phase flow. However, CSF model requires quadrilaterals or hexahedra cell type and dynamic mesh requires triangular and tetrahedral cell type. I want to know if there is a method to balance the problem.

Best Regards

Cheng Chen

vinerm · June 22, 2020, 04:14

There are no such requirements of CSF. It works with all types of meshes.

OtisChen · June 22, 2020, 04:26

Quote:

Originally Posted by vinerm

There are no such requirements of CSF. It works with all types of meshes.

The CSF model can indeed use different types of grids.However, except quadrilateral and polyhedral mesh, patched liquid level will be uneven, which will cause a large error in surface tension calculated by CSF.

vinerm · June 22, 2020, 04:30

Yes, that is certainly the case, but you have to find a compromise. And it also depends on the motion of the boundary and its proximity to the interface.

OtisChen · June 22, 2020, 04:48

Quote:

Originally Posted by vinerm

Yes, that is certainly the case, but you have to find a compromise. And it also depends on the motion of the boundary and its proximity to the interface.

My model is an open channel flow of boat, so it's really hard to balance.I want to know whether Cutcell remeshing method is available. I generate Cartesian grid in ICEM and select Spring Smothing method in Fluent, but this will cause MPI.When diffusion is selected, it indicates that the current diffusion method is not applicable to the polyhedral mesh.

vinerm · June 22, 2020, 05:00

If you are only using smoothing, then you can work with full hex as well. However, if you are using remeshing, then hex won't work. I am not sure whether new version handle cutcell or not. But you can try with overset. That could be a better alternative to deforming mesh.

OtisChen · June 22, 2020, 05:07

Quote:

Originally Posted by vinerm

If you are only using smoothing, then you can work with full hex as well. However, if you are using remeshing, then hex won't work. I am not sure whether new version handle cutcell or not. But you can try with overset. That could be a better alternative to deforming mesh.

Thank you. I'll try the overset.

sincerely！

June 21, 2020, 23:13	csf models couple with dynamic mesh	#1
OtisChen New Member Cheng CHEN Join Date: Jun 2020 Posts: 8 Rep Power: 5	Dear all: I was studying a question which needs to couple with CSF model(to calculate surface tension) with dynamic mesh in two phase flow. However, CSF model requires quadrilaterals or hexahedra cell type and dynamic mesh requires triangular and tetrahedral cell type. I want to know if there is a method to balance the problem. Best Regards Cheng Chen

June 22, 2020, 04:14	Csf	#2
vinerm Senior Member Vinerm Join Date: Jun 2009 Location: Nederland Posts: 2,946 Blog Entries: 1 Rep Power: 35	There are no such requirements of CSF. It works with all types of meshes. __________________ Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.

June 22, 2020, 04:30	CSF and DM	#4
vinerm Senior Member Vinerm Join Date: Jun 2009 Location: Nederland Posts: 2,946 Blog Entries: 1 Rep Power: 35	Yes, that is certainly the case, but you have to find a compromise. And it also depends on the motion of the boundary and its proximity to the interface. __________________ Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.

June 22, 2020, 05:00	Smoothing	#6
vinerm Senior Member Vinerm Join Date: Jun 2009 Location: Nederland Posts: 2,946 Blog Entries: 1 Rep Power: 35	If you are only using smoothing, then you can work with full hex as well. However, if you are using remeshing, then hex won't work. I am not sure whether new version handle cutcell or not. But you can try with overset. That could be a better alternative to deforming mesh. __________________ Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.

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