|
[Sponsors] |
DPMFoam pressure poisson and momentum corrector |
![]() |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
![]() |
![]() |
#1 |
Member
Bas Nieuwboer
Join Date: Mar 2013
Posts: 32
Rep Power: 13 ![]() |
Dear Foamers,
I am writing out the equations for solving the fluid motion as used in DPMFoam and I came to what I thought to be an inconsistency. Can someone help me by pointing out the error I am making in the derivation of the pressure Poisson equation and momentum corrector for DPMFoam? In the derivation I am leaving out the forces of the particles on the fluid for simplicity. I am deriving the pressure poisson and the momentum corrector from two starting points. But I cannot get them matched up with the code. Method A: Start with the update formulation for the fluid: ![]() The continuity equation is used to derive the pressure poisson equation ![]() These two equations are combined and lead to the wrong pressure poisson equation: ![]() The momentum predictor is right: ![]() Method B: Start with the update formulation without the concentration: ![]() The same continuity equation is used to derive the pressure poisson equation The two equations are combined and lead to the right pressure poisson equation: ![]() However, the momentum predictor is wrong: ![]() At method A the pressure poisson equation is wrong compared with the code and in method B the momentum corrector is wrong. I cannot find literature on the derivation of the pressure Poisson for a fluid with a void fraction. Also in the really nice document of Jeroen Hofman, this is not addressed. Can someone help me address this issue? |
|
![]() |
![]() |
![]() |
Tags |
dpmfoam, momentum predictor, openfoam, poisson equation |
|
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
Pressure boundary condition | C-H Kuo | Main CFD Forum | 18 | September 16, 2016 03:19 |
pressure poisson boundary condition in SIMPLE family of coupling algorithm | f0208secretx | FLUENT | 1 | April 7, 2015 23:40 |
Pressure enigma. | Sara | Main CFD Forum | 22 | July 30, 2009 04:46 |
Immersed boundary method with momentum forcing | Fuka | Main CFD Forum | 1 | February 6, 2006 03:46 |
pressure poisson equation on staggerred grid | chandra | Main CFD Forum | 9 | May 5, 2005 06:01 |