To compile User Defined Functions (UDF) with ANSYS you need to install a C++ compiler. ANSYS recommends Visual C++ which is freely available in form of Visual Studio Community.
In this article I will only consider the case of x64 ANSYS.
1. Update udf.bat
Go to C:\Program Files\ANSYS Inc\v162\fluent\ntbin\win64 and back up the file udf.bat. We need to modify this file to add support for Visual C++ 2015. To this end, add below set MSVC_VERSION=0 the following lines
echo trying to find MS C compiler, version 140....
set MSVC_DEFAULT=%ProgramFiles(x86)%\Microsoft Visual Studio 14.0
if exist "%MSVC_DEFAULT%\VC\vcvarsall.bat" set MSVC=%MSVC_DEFAULT%
if not "%MSVC%" == "" goto msvc_env140
Moreover, add above :msvc_env71 the following lines
:msvc_env140
set MSVC_VERSION=140
call "%MSVC%\VC\vcvarsall.bat" x64
goto ms_c_end
Save the file udf.bat and you are good to go.
2. Compile your UDF
- Make sure your code, header, mesh and fluent files are contained in a single folder (project folder).
- Open ANSYS fluent and select the project folder as the current working directory.
- In ANSYS’ main window select Define -> User Defined Function -> Compile
X. Hint
Make sure in your UDF file’s DEFINE statements are not spaces between brackets.
DONT
DEFINE_PROFILE (current_dens,t,i)
DO
DEFINE_PROFILE(current_dens,t,i)
Additional spaces may lead to erratic behavior of the makefile script so that defined SOURCES, PROFILES, or DIFFUSIVITIES do not show in Fluent.