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My UDF works well with Fluent 16 but not with Fluent 19 |
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October 17, 2018, 23:03 |
My UDF works well with Fluent 16 but not with Fluent 19
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#1 |
New Member
Ahmed Awwad
Join Date: Feb 2018
Posts: 21
Rep Power: 8 |
My UDF works well with Fluent 16 but did not works well with Fluent 19.
Is there any modification I have to do with my UDF or any setting in Fluent 19? I attached The UDF to your consideration #include "udf.h" #define m 17 #define cp 4182 real Q[8761]; real avetempa=288.15; DEFINE_ON_DEMAND(read_data) { int i; real b; FILE *rfile; /* declare a FILE pointer */ #if RP_HOST host_to_node_sync_file("test.dat"); #endif #if RP_NODE host_to_node_sync_file("/"); #endif rfile = fopen("data.txt", "r"); /* open file for reading */ #if RP_HOST Message("file opened\n"); #endif for (i=0;i<8760;i++) { fscanf(rfile, "%f\n", &b); /* that supposes one value per line */ Q[i]=b; } fclose(rfile); #if RP_HOST Message("file closed\n"); #endif } /* Defining outlet temperature.*/ DEFINE_ADJUST(average_exit_temp,domain) { real tempa=0.0; real totalarea=0.0; int ID1 = 4;//'108; /* the outlet boundary condition identifier*/ int ktt=N_TIME-1; #if !RP_HOST face_t f1; real A[ND_ND]; Thread *outlet_thread = Lookup_Thread(domain,ID1); begin_f_loop(f1,outlet_thread) { if PRINCIPAL_FACE_P(f1,outlet_thread) { F_AREA(A,f1,outlet_thread); totalarea +=NV_MAG(A); tempa +=NV_MAG(A)*F_T(f1,outlet_thread); } } end_f_loop(f1,outlet_thread) #if RP_NODE tempa = PRF_GRSUM1(tempa); totalarea = PRF_GRSUM1(totalarea); #endif avetempa= tempa/totalarea; if(ktt==0) avetempa=288.15; # endif node_to_host_real_1(avetempa); #if RP_HOST Message("average temperature : %g K q7=%g\n",avetempa,Q[ktt]); #endif } DEFINE_PROFILE(Inlettemp,thread,pos) { face_t f; real x[ND_ND],btt; real ftime = CURRENT_TIME; int k_time=N_TIME; real qheat=Q[k_time-1]; #if RP_NODE begin_f_loop(f, thread) { if PRINCIPAL_FACE_P(f,thread) { if(ftime<1200) btt=288.15; else btt = avetempa +((qheat-0.0000008*ftime)/(m*cp/60)); F_PROFILE(f, thread, pos) =btt; } } end_f_loop(f, thread) #endif } |
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October 18, 2018, 13:53 |
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#2 |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,761
Rep Power: 66 |
Fluent v19 and onwards no longer supports serial mode because they want the environment to be the same from now on. A consequence is that udf's which previously only worked in serial will no longer work because there is no longer a serial mode.
You can start Fluent in serial mode by passing the -t0 flag. Launching Fluent in serial mode will actually start parallel Fluent, equivalent to the -t1 flag. Or fix your udf. Sorry I'm too lazy to debug your udf. |
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October 18, 2018, 20:17 |
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#3 | |
New Member
Ahmed Awwad
Join Date: Feb 2018
Posts: 21
Rep Power: 8 |
Quote:
I used parallel fluent on Fluent 16, and this UDF is working good but when I tried it with Fluent 19 it compiled without errors, and I hooked the inlet profile and executed the read data macros but when I initialized and started calculation I found that q_time=0 and did not change with time. q_time values are stored in the data.txt file which has 8761 readings what do you think is the wrong is it the structure of UDF or problem in Fluent 19? |
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October 19, 2018, 12:38 |
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#4 |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,761
Rep Power: 66 |
What the heck is q_time? It's not in your udf anywhere.
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