|
[Sponsors] |
November 21, 2004, 02:47 |
Pressure Inlet yields wrong velocities
|
#1 |
Guest
Posts: n/a
|
Hello,
I am using Fluent 6 to simulate the supersonic air flow in a 2d tube. I am using a pressure inlet and pressure outlet. I know what the static pressure and total pressure is at the inlet, along with total temperature. ptot = 80 psi pstatic = 12 psi Ttot = 600 K Therefore I have a pressure ratio of .15 using Isentropic tables this gives me a Mach number of M =1.9 and a velocity of 779 m/s For the Pressure inlet BC: I set the Total gauge pressure equal to the ptot-p_operating I set the supersonic/inital gauge pressure = to pstatic-poperating For the Pressure Outlet BC: I set the gauge pressure to the gauge pressure of the of the inlet. But this shouldn't matter since it is all supersonic flow The problem is that fluent computes a velocity at the inlet that is at least too large by a factor of 2! Any ideas what could be going wrong here? I am using an "operating pressure" of 0.1 psi, because if I set it to zero I get a "floating point error." I am using the segregated solver, but even if I use the coupled solver I get similar results. Thanks for your help in advance, Ben |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Pulsatile pressure inlet with pressure outlet | a.lynchy | FLUENT | 3 | March 23, 2012 14:45 |
tank sloshing - getting wrong pressure | enghamed | CFX | 2 | April 26, 2011 23:09 |
pressure inlet bc in fluent | nikhil | FLUENT | 0 | June 28, 2010 17:30 |
High pressure concentration results @ the inlet | Kuh | CFX | 0 | June 25, 2007 00:42 |
Hydrostatic pressure in 2-phase flow modeling (long) | DS & HB | Main CFD Forum | 0 | January 8, 2000 16:00 |