force&pressure non newt fluid

Dave_000 · May 27, 2014, 05:38

Hi everyone, I'm trying to calculate some forces on a valve that operate with a non-newtonian fluid and 50 Mio Pa. I put this pressure in the "operating pressure" box, but I don't understand why the forces don't change if I change this p. Another problem is that the forces see by Fluent are really too low (7000 N) in comparison with the operting pressure. I'm using a pressure based solver so I think the operating pressure should not affect the solution (is an incompressible fluid), so the question is

1)How can I set Fluent in order to consider the real operating pressure in the force calculation?

This is a transient problem and I need to calculate the frequency of variation of the pressure field on a particular surface. I divided my surface from the other parts during the mesh process, so I can plot the value of the pressure on this surface.

2)How can i get the frequency of the pressure field?

Any information would be really appreciated.

Thanks in advance,

Dave

Dave_000 · May 29, 2014, 05:15

Someone can help me, please?

Dave_000 · June 1, 2014, 04:03

Up? It's quite important..

May 27, 2014, 05:38	force&pressure non newt fluid	#1
Dave_000 New Member Davide Join Date: Apr 2014 Posts: 6 Rep Power: 12	Hi everyone, I'm trying to calculate some forces on a valve that operate with a non-newtonian fluid and 50 Mio Pa. I put this pressure in the "operating pressure" box, but I don't understand why the forces don't change if I change this p. Another problem is that the forces see by Fluent are really too low (7000 N) in comparison with the operting pressure. I'm using a pressure based solver so I think the operating pressure should not affect the solution (is an incompressible fluid), so the question is 1)How can I set Fluent in order to consider the real operating pressure in the force calculation? This is a transient problem and I need to calculate the frequency of variation of the pressure field on a particular surface. I divided my surface from the other parts during the mesh process, so I can plot the value of the pressure on this surface. 2)How can i get the frequency of the pressure field? Any information would be really appreciated. Thanks in advance, Dave

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
mass flow in is not equal to mass flow out	saii	CFX	12	March 19, 2018 05:21
Multiphase simulation of bubble rising	Niru	CFX	5	November 25, 2014 13:57
Interior walls temperature dependant on fluid	zombiaska	FLUENT	1	January 10, 2014 03:35
My Revised "Time Vs Energy" Article For Review	Abhi	Main CFD Forum	2	July 9, 2002 09:08
Terrible Mistake In Fluid Dynamics History	Abhi	Main CFD Forum	12	July 8, 2002 09:11

May 29, 2014, 05:15		#2
Dave_000 New Member Davide Join Date: Apr 2014 Posts: 6 Rep Power: 12	Someone can help me, please?

June 1, 2014, 04:03		#3
Dave_000 New Member Davide Join Date: Apr 2014 Posts: 6 Rep Power: 12	Up? It's quite important..