CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

Pressure drop momentum source model

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   June 1, 2012, 21:58
Default Pressure drop momentum source model
New Member
Join Date: Apr 2010
Posts: 4
Rep Power: 9
delic is on a distinguished road
I wrote a pressure drop momentum source model for a CFD code and I am having problems with unrealistically high density (causes low temperature via gas law) in the source volume, particularly in low velocity areas. It is almost like the density rises instead of the static pressure dropping in those areas.. (Ptot=Pstat+1/2rhoV^2). The code solves the five rho, rhou, rhov, rhow, and rhoe.

The source model is fairly simple. Force=Pressure*Area=A*V^B*AreaOfCell where A and B are the constants to a power fit and V is the velocity component. A pressure drop is computed for the x,y, and z directions.

I tried linearization of the source terms, damping, relaxation, etc with no luck. I tried running laminar and invisicid with same results. I feel like I am missing some major piece of the physics or numerics or something.

If anyone has any ideas/hints I would love to hear them, especially if you have written a pressure drop/fan source model in a CFD code.

delic is offline   Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
groovyBC in openFOAM-2.0 for parabolic velocity bc ofslcm OpenFOAM Pre-Processing 25 March 6, 2017 11:03
Pipe Flow - Pressure Drop Daniel L FLOW-3D 2 December 10, 2010 05:23
Element coordinates for momentum source model CFDworker CFX 3 October 10, 2007 11:05
Neumann pressure BC and velocity field Antech Main CFD Forum 0 April 25, 2006 02:15
Hydrostatic pressure in 2-phase flow modeling (CFX4.2) HB &DS CFX 0 January 9, 2000 14:19

All times are GMT -4. The time now is 08:33.