I advise you to follow this link.

https://www.researchgate.net/post/How_to_model_non-Newtonian_fluid_flows

Regards

Dear Pr. Bachir Achour

Thank you for your reply however my question is about sludge flow (non-newtonian fluid flow). And I which to know what is the advantage of using one CFD code over another?

Best regards,

Tariq.

Tariq Ouahbi

https://www.researchgate.net/post/How_to_model_non-Newtonian_fluid_flows

Bachir Achour has given Good Suggestion

Dear S Anuradha

Thank you for the link and for your contribution.

Best regards,

Tariq.

One way to perform such CFD simulation is to write a UDF with the correct sludge properties and use it with FLUENT.

Dear Ahmad K. Sleiti ,

Thank you for your reply.

Can you give me with your experience what are the advantages of Fluent compared to other free CFD codes (like OpenFoam for example).

Thanks again for your contribution.

Best regards,

Tariq.

FLUENT is a commercial software with research grade quality. It has good capabilities with good interface user friendly. Users can run simulations even if they are not experts in CFD.

OpenFoam is an open source, it is perfect for those who are good at coding (programming) and good understanding of numerical techniques.

Dear Ahmad K. Sleiti , thank you for your contribution.

I tried years ago (c. 1994) with STAR-CD, which struggled - but CFD programs have come on a long way. The biggest problem was that STAR-CD only understood Newtonian flow, so I had to report the Newtonian equivalent viscosity, which with my problem (I had a yield stress term) meant that the solver struggled in regions with low velocity.

The OpenFoam settling tank solver has a nonNewtonian model as standard, so you might want to look at that for ideas.