{"id":294077,"date":"2023-07-20T10:27:08","date_gmt":"2023-07-20T10:27:08","guid":{"rendered":"\/forum\/forums\/topic\/issues-compiling-udf-in-ansys-fluent-udf-not-being-read-correctly\/"},"modified":"2023-07-20T10:30:18","modified_gmt":"2023-07-20T10:30:18","slug":"issues-compiling-udf-in-ansys-fluent-udf-not-being-read-correctly","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/issues-compiling-udf-in-ansys-fluent-udf-not-being-read-correctly\/","title":{"rendered":"Issues compiling UDF in ANSYS Fluent – UDF not being read correctly?"},"content":{"rendered":"

I am attempting to use user defined functions to define the Launder Sharma low reynolds number turbulence model. The source code has been written and published in a paper from 2013, I have made no adaptations to the code provided, however I am getting a host of errors related to unknown type names and undeclared identifiers. Before all the errors is a warning that the MSVC compiler ‘cl’ could not be found and may need to be installed separately with visual studio. I then attempted to trouble shoot the problem by trying the sample UDF code from the ansys user guide (included below), as a control guide. However I am still getting the compiler warning and 3 errors. Any suggestions on what could be causing the issue, is it a compiler issue as I think?<\/p>\n

Thank you<\/p>\n

Sample code from ANSYS User Guide:<\/div>\n
#include “udf.h”<\/div>\n
#define C2 100.0<\/div>\n
DEFINE_SOURCE(xmom_source, c, t, dS, eqn)<\/div>\n
{<\/div>\n
real x[ND_ND];<\/div>\n
real con, source;<\/div>\n
 <\/div>\n
C_CENTROID(x, c, t);<\/div>\n
con = C2 * 0.5 * C_R(c, t) * x[1];<\/div>\n
 <\/div>\n
source = -con * fabs(C_U(c, t)) * C_U(c, t);<\/div>\n
dS[eqn] = -2. * con * fabs(C_U(c, t));<\/div>\n
 <\/div>\n
return source;<\/div>\n
}<\/div>\n

 <\/p>\n

Errors within fluent :<\/p>\n

udf_names.c(6,8): warning: type specifier missing, defaults to ‘int’ [-Wimplicit-int]<\/p>\n

extern DEFINE_SOURCE(xmom_source, c, t, dS, eqn);<\/p>\n

~~~~~~ ^<\/p>\n

udf_names.c(6,22): error: a parameter list without types is only allowed in a function definition<\/p>\n

extern DEFINE_SOURCE(xmom_source, c, t, dS, eqn);<\/p>\n

^<\/p>\n

udf_names.c(8,28): error: use of undeclared identifier ‘xmom_source’<\/p>\n

{“xmom_source”, (void(*)())xmom_source, UDF_TYPE_SOURCE},<\/p>\n

^<\/p>\n

udf_names.c(10,46): error: invalid application of ‘sizeof’ to an incomplete type ‘UDF_Data []’<\/p>\n

__declspec(dllexport) int n_udf_data = sizeof(udf_data)\/sizeof(UDF_Data);<\/p>\n

^~~~~~~~~~<\/p>\n

11 warnings and 3 errors generated.<\/p>\n

scons: *** [udf_names.obj] Error 1<\/p>\n

scons: building terminated because of errors.<\/p>\n

 <\/p>\n

Done.<\/p>\n","protected":false},"template":"","class_list":["post-294077","topic","type-topic","status-closed","hentry","topic-tag-2d-cfd-1","topic-tag-ansys-cfd-1","topic-tag-udf","topic-tag-udferror"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t