wall shear stress in UDF

August 11, 2008, 01:07

Hello everyone, I am writing an UDF in which I need to calculate the X wall shear stress. I know that there isn't a dedicated macro; one can just accesses to the velocity gradient vectors (G_U_G and G_V_G). Does anybody know how I can do? my simulation is laminar, 2d and my fluid is incompressible. Thank you very much for any help!

Lucrecio · August 13, 2008, 08:36

hello Elisa

F_STORAGE_R_N3V(f,thread,SV_WALL_SHEAR) will return a vector for each face on wall boundaries with components representing the shear stresses in xyz-directions.

cheers Max

August 11, 2008, 01:07	wall shear stress in UDF	#1
elisa Guest Posts: n/a	Hello everyone, I am writing an UDF in which I need to calculate the X wall shear stress. I know that there isn't a dedicated macro; one can just accesses to the velocity gradient vectors (G_U_G and G_V_G). Does anybody know how I can do? my simulation is laminar, 2d and my fluid is incompressible. Thank you very much for any help!

August 13, 2008, 08:36	Re: wall shear stress in UDF	#2
max Guest Posts: n/a	hello Elisa F_STORAGE_R_N3V(f,thread,SV_WALL_SHEAR) will return a vector for each face on wall boundaries with components representing the shear stresses in xyz-directions. cheers Max Lucrecio likes this.

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