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UDF extern variable - mean time moment coefficient |
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November 14, 2009, 07:51 |
UDF extern variable - mean time moment coefficient
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Senior Member
Herman
Join Date: Nov 2009
Posts: 122
Rep Power: 17 |
Hi ! I wanna calculate the mean time moment coefficient in an unsteady simulation.
I write a function as DEFINE_EXECUTE_AT_END in order to have the moment coefficient at the end of time step, and the program sum cm every time step. So I have the sum of every cm for all time step at the end of simulation. The problem is: how can I declare the variable "sum_cm" as an extern variable, in order to divide it at the end of the simulation? I try to write the next program: #include "udf.h" #include "extfile.h" DEFINE_EXECUTE_AT_END(moment_coefficient) { real NV_VEC(A); real moment = 0., x_nodo = 0., y_nodo = 0.; int IDblades = 10, IDblades_sh = 14; int n; face_t f,f_sh; Thread *f_thread, *f_thread_sh; Domain *d; Node *node; d = Get_Domain(1); /* Default Interior ID */ if(NULL == d) printf("Something wrong with your domain id!\n"); f_thread = Lookup_Thread(d, IDblades); f_thread_sh = Lookup_Thread(d,IDblades_sh); if(NULL == f_thread) printf("Something wrong with your face id!\n"); if(NULL == f_thread_sh) printf("Something wrong with your face shadow id!\n"); /*if(!BOUNDARY_FACE_THREAD_P(f_thread)) Error("Something wrong with your face id!\n"); */ begin_f_loop(f,f_thread) { F_AREA(A,f,f_thread); f_node_loop(f,f_thread,n) { node = F_NODE(f,f_thread,n); x_nodo = NODE_X(node); y_nodo = NODE_Y(node); moment += F_P(f,f_thread) * A[1] * x_nodo - F_P(f,f_thread) * A[0] * y_nodo; } } end_f_loop(f,f_thread) begin_f_loop(f_sh,f_thread_sh) { F_AREA(A,f_sh,f_thread_sh); f_node_loop(f_sh,f_thread,n) { node = F_NODE(f_sh,f_thread,n); x_nodo = NODE_X(node); y_nodo = NODE_Y(node); moment += F_P(f_sh,f_thread_sh) * A[1] * x_nodo - F_P(f_sh,f_thread_sh) * A[0] * y_nodo; } } end_f_loop(f_sh,f_thread_sh) moment = moment/2; int_moment += moment; printf("\n MOMENT = %g \n", moment); printf("\n INT MOMENT = %g \n", int_moment); } where the extfile.h is the following: #include "udf.h" extern real int_moment = 0.; I compile it as "compiled UDF", but Fluent reports some errors, and the most dangerous is the following: moment_coefficient.c:2:21: error: extfile.h: No such file or directory CAN ANYBODY HELP ME?! |
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