CFD Online Logo CFD Online URL
Home > Forums > OpenFOAM Running, Solving & CFD

Which solver I should use when density of the fluid is not a constant

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

LinkBack Thread Tools Display Modes
Old   March 25, 2007, 04:26
Default Hi, all: This might be a qu
roy fokker
Join Date: Mar 2009
Posts: 44
Rep Power: 8
dbxmcf is on a distinguished road
Hi, all:

This might be a question that has been asked for several times, I am now solving a particle-fluid coupling equation, which the fluid phase has the following governing N-S equations:
d(n)/dt + div(n*U) = 0;
d(n*U)/dt + div(n*UxU) = -n/rho_f*grad(p) + fp

Where n is the porosity of the fluid-particle mixture, the only difference between this equation and the general incompressible flow is that the density of the fluid is rho=rho_f*n, which means the density of the fluid cannot be considered as a constant (incompressible single phase flow case), and the density may vary from cell to cell (consider the flow in porous media), but it does not have an explicit relationship as p=rho*R*T I searched all application solvers and found this might be similar to twoPhaseEulerFoam, bubbleFoam or settlingFoam, however these solvers codes all include complicated k-Epislong model which I am not very sure which I should remove, ...etc, if, other conditions remain the same, I just want the density term appear in the UEqn of icoFoam(surely I should change the pressure equation accordingly), which solver is the best choice to start with? Modify from icoFoam or simpleFoam and add the "rho" term, OR, modify the two phase models such as bubbleFoam or twoPhaseEulerFoam, OR, use a compressible solver like sonicFoam (which has rho term included but the explicit relationship p=rho*R*T is used for pressure equation)

I have weak background in CFD so please forgive my possible stupid fundamental questions. Any kind of advice is welcome!

Thanks you very much!
dbxmcf 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
Constant density on a mixture RĂ©mi FLUENT 1 June 6, 2008 05:17
Boussinesq model gives constant density daol FLUENT 2 February 21, 2008 08:51
Density based solver Eswar Main CFD Forum 2 May 29, 2007 07:29
density of fluid and mixtur greg FLUENT 1 May 26, 2007 09:47
Read in a new constant to solver hsieh OpenFOAM Running, Solving & CFD 8 November 7, 2005 05:29

All times are GMT -4. The time now is 03:45.