How to use udf to write the gradient ,nabla and laplacian mathematial conventions? -- CFD Online Discussion Forums

May 11, 2021, 08:58

How to use udf to write the gradient ,nabla and laplacian mathematial conventions?

smilingwl

New Member

WANG LU

Join Date: Sep 2019

Posts: 22

Rep Power: 6

Hi, every one,
I need to write a new uds transport equation.And now,I was stuck by a question that I do not know how to compile the gradient,nabla,laplacian
mathematial conventions.I need to add a source term as the attached picture show.
Thank you for your help.
Best wishes!

Attached Images

_20210511205140.jpg (27.9 KB, 16 views)

May 11, 2021, 10:35		#2
pakk Senior Member Join Date: Nov 2013 Posts: 1,965 Rep Power: 26	Can you type the equation, your picture is unreadable. __________________ "The UDF library you are trying to load (libudf) is not compiled for parallel use on the current platform" is NOT the error after compiling. It is the error after loading. To see compiler errors, look at your screen after you click "build".

May 11, 2021, 21:12		#3
smilingwl New Member WANG LU Join Date: Sep 2019 Posts: 22 Rep Power: 6	Thank you for your reply. The equation as follow： $\nabla\cdot\left(\frac{keff}{C_{p}}\nabla\left(f_{v}L\right)\right)$ Best wishes!

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fluent - udf, source code, uds equation

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