[marsa27]

Hi,
I am interested to set variable properties with tempearature to my fluid in Fluent.
Can someone tell me how prepapare a UDF for these two expressions?


viscosity=A*e^(B/Temperature-D) where A,B,D are constant


specifheatCp=((A*-Temperature+B))/(1-D*(Temperature-F))


Thank you

[vemula]

Hi
You can use DEFINE_PROPERTY macro in the udf to define the value based on the temperature of each cell. Once you have an expression defined in the udf you can go to edit your material property page and in the drop down list select you can select user defined which gives a list of all the macros defined in the udf you can select the one you want