How can I add new variable or expression?
 

In Ansys Fluent 14.5
How can I add new variable or expression such as "M=Force*distance" to do mathematical processes such as integration.

this can be done in ansys cfx14.5 easily. If you know how to use fluent, cfx is almost the same. you can try it.

Steps
 

I really know good amount data about fluent package,but still need some help.
Tell me steps please ?

in ansys cfx, you can find toolbar-'expression'. you just add the a variable or expression you need

In Fluent you use Custom field functions for this.

In the top menu "Define", then "Custom Field Functions".