Pressure drops

Submitted by Dario Passafiume on Thu, 06/09/2022 - 15:46

Hello everyone.
By investigating the Ergun test case among the tutorials I noticed that if I run the case in noSlip conditions the pressure drops decrease, why is that? The no-slip condition should add an additional source of dissipation for the flow. How can the pressure drops decrease if I'm adding friction sources to the fluid flow?
Can you help me understand this effect, please?