|May 6, 2013, 16:17||
Total pressure and mass flow boundary condition at inlet
Join Date: Mar 2012
Posts: 27Rep Power: 4
i've some problems with my boundary conditions for a internal flow through a diffuser and the outflow in atmosphere.
For my case i must set the inlet total pressure + the inlet mass flow rate, because the diffuser is after an rotor/stator stage, which drops the total pressure to e.g. 101325 Pa + 680 Pa. The mass flow rate through the stage is constant e.g. 11.75 kg/s. The flow should be expanding to atmospheric static pressure e.g. 101325 Pa. Ok, this are the main restrictions...
My first attempt was for a incompressible RANS simulation with "simpleFoam":
My second attempt was:
My third attempt was:
My fourth attempt was:
Summary: i could not find out which boundary conditions are exactly right to set total pressure and mass flow rate (or velocity) at the inlet.
I hope somebody with some experience in a similar problem can help me, thanks and sorry for my poor english.
(the attached picture is a overview of the region)
Last edited by bscphil; May 7, 2013 at 04:22.
|May 28, 2013, 00:44||
Join Date: Jul 2009
Blog Entries: 1Rep Power: 8
Good one... first attempt seems to be the best practice in case of diffusing problems, but don't know how come your Total pressure is varying a lot.. Are you able to reach convergence??
|Thread||Thread Starter||Forum||Replies||Last Post|
|Wind turbine simulation||Saturn||CFX||32||October 8, 2013 07:53|
|An error has occurred in cfx5solve:||volo87||CFX||5||June 14, 2013 17:44|
|Low Mixing time Problem||Mavier||CFX||5||April 29, 2013 00:00|
|RPM in Wind Turbine||Pankaj||CFX||9||November 23, 2009 04:05|
|mass flow in is not equal to mass flow out||saii||CFX||2||September 18, 2009 08:07|