[eywer]

Hi,

I am working on a Fluent simulation with the following steps:

Modify the viscous resistance using a UDF.

Use the adjoint solver to initialize and calculate (observable = pressure drop).

Compute the adjoint sensitivity of pressure drop with respect to viscosity.

I have completed step 1, but I am not sure how to proceed with steps 2 and 3. I would greatly appreciate any guidance you can provide.

Thank you very much for your help!