Mesh; wall function for element based finite volume method

sheaker · January 25, 2018, 13:24

Hello dear ANSYS CFX users.

I'm doing simulation of turbine in CFX Turbomachinery solver. Previously I was using openFoam which is a finite volume method. I know how to prepare wall function for FVM but CFX is element based finite volume method and I am not sure if I should use wall function in the same way? ANSYS Mesher sets tetrahedrons volume as default for CFX. I wonder if I should use typical hexahedrons on wall function or just refine tetrahedron mesh enough?
I would like to use k-omega SST turbulence model.

I wish You best.
Oskar

ghorrocks · January 25, 2018, 17:08

Yes, the y+ parameter is the same for CFX as for other solvers.

Refined tets in the boundary layer is not recommended in most cases. Inflation layers giving you either triangular prisms or hexs is recommended.

sheaker · January 25, 2018, 17:36

Thank You for Your answer, Sir. I will use triangular prisms.
Have a nice day!
Oskar

January 25, 2018, 13:24	Mesh; wall function for element based finite volume method	#1
sheaker Senior Member Oskar Join Date: Nov 2015 Location: Poland Posts: 184 Rep Power: 10	Hello dear ANSYS CFX users. I'm doing simulation of turbine in CFX Turbomachinery solver. Previously I was using openFoam which is a finite volume method. I know how to prepare wall function for FVM but CFX is element based finite volume method and I am not sure if I should use wall function in the same way? ANSYS Mesher sets tetrahedrons volume as default for CFX. I wonder if I should use typical hexahedrons on wall function or just refine tetrahedron mesh enough? I would like to use k-omega SST turbulence model. I wish You best. Oskar __________________ How to set two stroke engine with scavenging? Salome, sliding interface and "Zero length edge detected."

January 25, 2018, 17:36		#3
sheaker Senior Member Oskar Join Date: Nov 2015 Location: Poland Posts: 184 Rep Power: 10	Thank You for Your answer, Sir. I will use triangular prisms. Have a nice day! Oskar __________________ How to set two stroke engine with scavenging? Salome, sliding interface and "Zero length edge detected."

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January 25, 2018, 17:08		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,723 Rep Power: 143	Yes, the y+ parameter is the same for CFX as for other solvers. Refined tets in the boundary layer is not recommended in most cases. Inflation layers giving you either triangular prisms or hexs is recommended.