CFD Online Logo CFD Online URL
Home > Forums > Phoenics

changing the coefficients of pressure correction

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

LinkBack Thread Tools Display Modes
Old   August 1, 2008, 11:52
Default changing the coefficients of pressure correction
Posts: n/a
Hi all, I need to do some change in IPSA PHOENICS to adjust with my two-phases problem. The source of momentum equation associated with pressure for U_i in PHOENICS is given by r_i*dP, where r_i is the volume fraction of phase-i and dP is the gradient of total pressure.

In my model, the relation between the first and the second phase pressure is expressed by : P1 + P2 = Pc where Pc will be given (a kind of capillary pressure). Therefore, P1 and P2 are not associated with its volume fractions.

I denote dP1, dP2 and dPc as the gradient of P1, P2, and Pc respectively. My plan is to use dP1 as the source of momentum for U_1, while for U_2 the source of momentum will be dPc - dP1 where dPc is given previously. In this way, the pressure correction will work on first phase pressure P1 instead of total pressure P.

To implement this, I will disactivate the term 'built-in source' (in order to cancel the gradient), then I will add dP1 (as source of U_1) and dPc-dP1 (as source of U_2) via GROUND.

I think the problem now is in pressure correction equation whose coefficients, in PHOENICS, has been built-in to accommodate the correction of total pressure in term of r_i*(dP).

Is there a possibility to change this coefficients via GROUND ? If yes, where (which Group) and how (the locations in F-array they are stored) ?

If there is another way which is easier to implement this, I will be pleased and grateful to know that.

Best Regards,

  Reply With Quote

Old   April 7, 2009, 08:54
New Member
paul zhang
Join Date: Mar 2009
Posts: 8
Rep Power: 8
9527 is on a distinguished road
i'm very intrested in your problem.i think we need a talk aboat this.
9527 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
Pressure coefficients antonio_ing OpenFOAM Running, Solving & CFD 8 August 8, 2012 07:22
Pressure coefficients antonio_ing OpenFOAM Post-Processing 1 December 29, 2008 23:01
pressure correction and absolure pressure George Main CFD Forum 5 March 22, 2005 07:10
pressure driven flow by pressure correction method justentered Main CFD Forum 0 December 30, 2003 00:52
Van Kan pressure correction. frederic felten Main CFD Forum 0 September 29, 2000 11:59

All times are GMT -4. The time now is 21:07.