UDF for PDE

chinu007 · January 9, 2020, 05:04

Hi everyone,

I want to write an UDF for the partial diffusion equation which I have, these PDE contains unsteady, diffusion, convective and source terms. I have no idea how to write a UDF/UDS for this governing equation.
Can anyone helpme with that?

vinerm · January 28, 2020, 09:51

Hi Vinay

Though I have not seen the equation you have but based on its physical components, i.e., transient, convection, diffusion, and source, you do not require a UDF. You may just enable a UDS in Fluent and that makes the equation available.

UDF would be required, in addition to the UDF, if you want to specify some complicated relation for its source or its diffusion coefficient is affect by turbulence, or if the transient component is treated differently from standard conservation equations.

January 9, 2020, 05:04	UDF for PDE	#1
chinu007 New Member Vinay Chandrakar Join Date: Jun 2019 Location: Mumbai Posts: 10 Rep Power: 6	Hi everyone, I want to write an UDF for the partial diffusion equation which I have, these PDE contains unsteady, diffusion, convective and source terms. I have no idea how to write a UDF/UDS for this governing equation. Can anyone helpme with that?

January 28, 2020, 09:51	No need for UDF	#2
vinerm Senior Member Vinerm Join Date: Jun 2009 Location: Nederland Posts: 2,946 Blog Entries: 1 Rep Power: 35	Hi Vinay Though I have not seen the equation you have but based on its physical components, i.e., transient, convection, diffusion, and source, you do not require a UDF. You may just enable a UDS in Fluent and that makes the equation available. UDF would be required, in addition to the UDF, if you want to specify some complicated relation for its source or its diffusion coefficient is affect by turbulence, or if the transient component is treated differently from standard conservation equations. __________________ Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.

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