UDF to drag coefficient and non newtonian fluid

liliana · March 28, 2019, 14:13

Hi all!

Have you anyone wrote an UDF to calculate the drag coefficient on lagrangian particles (DPM) for non-newtonian fluid?

The DEFINE_DRAG_FORCE macro returns a value of 18*Re*CD/24. Althogh the Reynolds number is different for Newtonian and Non Newtonian fluid. I have tried changed the Reynolds number when returning the drag force, but it did not work.

Anyone can help?

pakk · April 1, 2019, 06:54

Quote:

I have tried changed the Reynolds number when returning the drag force, but it did not work.

You did not show your code, so we can't see what you tried.
And "it did not work" is a bit vague. What happened? Wrong results? Fluent crashed? Computer set on fire?

March 28, 2019, 14:13	UDF to drag coefficient and non newtonian fluid	#1
liliana Member Liliana de Luca Xavier Augusto Join Date: Feb 2013 Posts: 68 Rep Power: 13	Hi all! Have you anyone wrote an UDF to calculate the drag coefficient on lagrangian particles (DPM) for non-newtonian fluid? The DEFINE_DRAG_FORCE macro returns a value of 18ReCD/24. Althogh the Reynolds number is different for Newtonian and Non Newtonian fluid. I have tried changed the Reynolds number when returning the drag force, but it did not work. Anyone can help?