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

smilingwl · May 11, 2021, 09:58

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!

pakk · May 11, 2021, 11:35

Can you type the equation, your picture is unreadable.

smilingwl · May 11, 2021, 22:12

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!

May 11, 2021, 11:35		#2
pakk Senior Member Join Date: Nov 2013 Posts: 1,965 Rep Power: 27	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".

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Third order derivative: Gradient of laplacian	hrushi.397	OpenFOAM Running, Solving & CFD	1	April 17, 2024 13:59
Why Laplacian is used instead of a combination of divergence and gradient operators?	HakikiCanakkaleli	OpenFOAM Programming & Development	3	September 26, 2019 08:40
Write function in Laplacian Foam	mvee	OpenFOAM Running, Solving & CFD	3	March 9, 2018 04:22
UDF for the Laplacian of chemical concentration	geauxtigers	Fluent UDF and Scheme Programming	0	April 7, 2014 19:03
gradient or laplacian of an unstructured field	sawyer86	OpenFOAM Post-Processing	0	March 13, 2014 12:40

May 11, 2021, 22:12		#3
smilingwl New Member WANG LU Join Date: Sep 2019 Posts: 22 Rep Power: 7	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!