Thank you for your responses.nnI am using Ansys for Linux which is preinstalled in my College system and HPC cluster. it is installed using singularity. n,I just took my udf along with case and data file (generated in window based Ansys) and tried compiling/interpreting the udf in the fluent (In Linux), nI am using Ansys 18.1 version, If I remember correctly, this functionality is recently introduced and is available in ansys 2020 version. My college have only 18.1 version of Ansys, so I have to use udf. n