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July 2, 2006, 09:55 |
wall shear stress
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#1 |
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I would like to access the WALL Shear stress on the boundary faces. When I complied the UDF file to FLUENT, this line, NV_V(wallshear,=,C_STORAGE_R_NV(f,t,SV_WALL_SHEAR) );, has problem. The value of wallshear was not an array, and it was not reasonable. I hope that someone can point the problem out. The problem makes me quite confused. Thanks a lot.
#include "udf.h" #include "sg.h" #include "mem.h" #include "sg_pdf.h" #define PI 3.1415926 DEFINE_GRID_MOTION(ccc, domain, dt, time, dtime) { Thread *tf=DT_THREAD(dt); Thread *t; face_t f; cell_t c; Node *node_p; real Z_A,A_by_es,www,NV_VEC(WSS),AA,Z_B,area,NV_VEC(wal lshear),NV_VEC(A); int n; if (!Data_Valid_P()) return; SET_DEFORMING_THREAD_FLAG(THREAD_T0(tf)); AA=sin(2.0*PI*time); begin_f_loop(f,tf) { c=F_C0(f,tf); t=THREAD_T0(tf); NV_V(wallshear,=,C_STORAGE_R_NV(f,t,SV_WALL_SHEAR) ); ------------------ ------------------ } end_f_loop(f,tf); } |
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July 2, 2006, 14:30 |
Re: wall shear stress
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#2 |
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The UDF cannot be compiled in Windows OS, but it can be compiled in Unix O. When it is compiled in Unix, Fluent ignored the C_STORAGE_R_NV(f,t,SV_WALL_SHEAR). When in Windows, the error message:
Updating solution at time level N... done. Updating mesh at time level N... Error: FLUENT received fatal signal (ACCESS_VIOLATION) 1. Note exact events leading to error. 2. Save case/data under new name. 3. Exit program and restart to continue. 4. Report error to your distributor. Error Object: () I am not sure whethre the UDF can storage the WALL_SHEAR_STRESS, since the value is either more than 1 billion or 0 in windows. In Unix, the value is 0, since this commond is ignored. I also doubt the C_STORAGE_R_NV(face, face_thread, SV_WALL_SHEAR), since the C means the cell, I think, and the the variable and the thread are belonging to face. I google the Wall Shear Stress Macro, and I also find F_STORAGE_R_N3V(f,tf,SV_WALL_SHEAR). Therefore, the expression of WSS macro is a litttle confusing. Since I typed many words, I hope that I can get some response and the useful advices. God Bless Thanks You So Much. |
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