Keyur Kanade
Ansys Employee
You can add it to cell zone. Please have a look at following. nArrayAlso please search through forum. You can find some posts related to momentum source like following. n

Hi, You can as this as a momentum source term. Note - this is going to have to be a volumetric term. Please see this Fluent User Guide link below for additional details.https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v202/en/flu_ug/flu_ug_sec_bc_source.html?q=sourceAlso, you don't need a UDF. Please see if you are able to use Ansys Fluent Expressions for this.https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v202/en/flu_ug/flu_ug_expressions.htmlThank you.Karthikhttps://forum.ansys.com/discussion/comment/97789#Comment_97789

Regards,nKeyurnHow to access Ansys Online Help DocumentnHow to show full resolution imagenGuidelines on the Student CommunitynHow to use Google to search within Ansys Student Communitynn