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wall shear stress based on primary phase in eulerian multiphase model

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Old   January 21, 2013, 05:16
Default wall shear stress based on primary phase in eulerian multiphase model
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hi. I am using the eulerian multiphase model to simulate flow boiling. To define some boiling parameters in my udf, i require to access the wall-shear stress based on liquid (primary) phase velocity gradient on walls. my simulation is 2D.

Based on suggestions on other posts in the forum, I have tried using the following syntaxes

1. NV_MAG(F_STORAGE_R_N3V(f,ptf[0],SV_WALL_SHEAR))/face_area
2. NV_MAG(F_STORAGE_R_N3V(f,ptf[0],SV_WALL_SHEAR)[0])/face_area

however, i find the usual ACCESS_VIOLATION error.

I am guessing that the syntax is incorrect somewhere, especially when applied to the 2D case. Any help in identifying the error is greatly appreciated.

Last edited by Abishek; January 21, 2013 at 06:19.
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Old   May 31, 2022, 12:15
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Try to define first the correct pointer "pt_liq" to the correct thread t (mixture thread, wall thread, not cell adjacent to wall!) in your begin_f_loop(f,t)

pt_liq= THREAD_SUB_THREAD(t,0);
tau_w=NV_MAG(F_STORAGE_R_N3V(f,pt_liq,SV_WALL_SHEA R));
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boiling, eulerian, multiphase, sv_wall_shear, wall shear stress

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