# Fluent UDF in CFX

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 October 21, 2008, 09:24 Fluent UDF in CFX #1 CFX User Guest   Posts: n/a Hello All I have a UDF written in C for use in Fluent Now I began to work on CFX and I am new to using CFX and writing subroutines in it. Is there a way where CFX can compile codes written for Fluent or do I have to write a Fortran code all over again for CFX Thank you Sandilya

 October 21, 2008, 17:18 Re: Fluent UDF in CFX #2 CycLone Guest   Posts: n/a No, you'll need to reproduce it for CFX. What does the UDF do? Most of what you would do with a UDF in Fluent you can do directly in CFX with CEL. -CycLone

 October 21, 2008, 18:23 Re: Fluent UDF in CFX #3 CFX User Guest   Posts: n/a The UDF adds two new scalar transport equations, one for solving for electric potential in the domain and the other for calculating the ion transport in the domain. These equations are as follows 1) Poisson Equation with space charge source term Del^2(phi) = -ion density/epsilon 2) Ion Transport equation Del.( A*rho + B*rho + C*rho ) = Diff Coeff * [Del^2 (rho)] rho is ion density A , B, C are functions of velocity, phi etc i.e. the two scalar transport equations are coupled and inturn they are both coupled to flow equations What is CEL in CFX and how to include above scalar transport equations in CFX Thank you

 October 22, 2008, 05:42 Re: Fluent UDF in CFX #4 underGroundMan Guest   Posts: n/a Its easy to do that in CFX using CEL. Have a read about CEL in documentation. Regards

 October 22, 2008, 11:55 Re: Fluent UDF in CFX #6 CFX-User Guest   Posts: n/a Thank you very much for the detailed response CFX-User

 October 22, 2008, 17:21 Re: Fluent UDF in CFX *NM* #7 CFX-user Guest   Posts: n/a

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