# Wall Shear stress argument.

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 December 13, 2007, 09:36 Wall Shear stress argument. #1 Dimitrios K. Fytanidis Guest   Posts: n/a Dear all, i'm working on a project, in which i have to use the value of wall shear stress (wss) in a UDF. The main problem is that i can not find the wss argument name. Could anyone tell me the name of this particular variable? Of course, i have already unsuccesfully check the User guide. Thank in advance for your variable help. Dimitrios K. Fytanidis

 December 14, 2007, 09:37 Re: Wall Shear stress argument. #2 szz Guest   Posts: n/a Hi Dimitrios, with this command you can retrieve the wall shear stress of a certain face f, e.g. in a loop over all faces of a thread tf. The result is a 3D-Vector (there should be one for 2D as well), here the components are stored separately: F_x = F_STORAGE_R_N3V(f,tf,SV_WALL_SHEAR)[0]; F_y = F_STORAGE_R_N3V(f,tf,SV_WALL_SHEAR)[1]; F_z = F_STORAGE_R_N3V(f,tf,SV_WALL_SHEAR)[2]; Hope this helps, Regards szz

 December 14, 2007, 13:37 Re: Wall Shear stress argument. #3 Dimitrios K. Fytanidis Guest   Posts: n/a Thank you szz, But could you please tell me if these are stresses or forces. I check them and i found really strange results. Generally, I need the value of the component of Wall Shear Stress. Thank you in advance for your variable help. Dimitrios

 December 15, 2007, 09:04 Re: Wall Shear stress argument. #4 szz Guest   Posts: n/a Hi, sorry, it's the forces of course. Dividing by the area should be possible for both the overall force and the components. F_AREA(A, f, tf); area = NV_MAG(A); I have found that although the value is accurate one has to be careful about the sign of the shear forces. Regards szz.

 December 16, 2007, 10:33 Re: Wall Shear stress argument. #5 Dimitrios K. Fytanidis Guest   Posts: n/a Thank you szz!!! Your help was really as usefull as valiable!!! Regards, Dimitrios

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