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

reference pressure with pimpleDyMFoam

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

LinkBack Thread Tools Display Modes
Old   September 17, 2015, 07:10
Default reference pressure with pimpleDyMFoam
New Member
Join Date: Apr 2013
Posts: 3
Rep Power: 6
grjones10 is on a distinguished road
Dear All,

I am having problems with the reference pressure when I use pimpleDyMFoam.

I am using pure Crank-Nicolson in time and central differencing in space. I use GAMG for pressure and mesh motion and PBiCG for velocity. Furthermore, my BCs are as follows:

front: p = cyclic, U = cyclic, pointDisplacment = fixedValue
back: p = cyclic, U = cyclic, pointDisplacment = fixedValue
inlet: p = zeroGradient, U = fixedValue , pointDisplacment = fixedValue
outlet: p = zeroGradient, U = advective, pointDisplacment = fixedValue
aerofoil: p = zeroGradient, U = fixedValue, pointDisplacment = fixedValue
controlSurfaces: p = zeroGradient, U = movingWallVelocity, pointDisplacment = oscillatingDisplacement

The simulation runs and converges within 3 pimple iterations however each time step is taking a very long time and the pressure field is incorrect. When I say the pressure field is incorrect I mean that, despite setting pRefValue = 0, the pressure in the reference cell is not zero. In fact, the pressure is not zero anywhere in the domain.

Please find some figure attached of the instantaneous pressure in my entire domain, in the vicinity of the pRefPoint and the trace of instantaneous pressure at pRefPoint as the grid moves.

Has anybody encountered this sort of thing before or have any ideas how to solve it? I would be extremely grateful for any advice.

I should also mention that I run the simulation in parallel and have tested 96 - 1500 cpus for my grid of 45 million cells. While in all cases the simulation is very slow (best case scenario 50 seconds per times step), it does scale linearly from 96 - 800 cpus.

Thank you for your time,



grjones10 is offline   Reply With Quote

Old   September 17, 2015, 09:06
New Member
Join Date: Apr 2013
Posts: 3
Rep Power: 6
grjones10 is on a distinguished road
Also, it appears that the reference pressure follows the acceleration of the grid? See figure attached.

Many Thanks,

grjones10 is offline   Reply With Quote


dynamicmesh, pimpledymfoam, prefcell, prefpoint, prefvalue

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
Wind tunnel Boundary Conditions in Fluent metmet FLUENT 5 September 19, 2017 00:09
problem with turbulence models after compilation? lfgmarc OpenFOAM Programming & Development 19 November 20, 2013 01:50
reference pressure and compressible flow bingo10 CFX 0 September 11, 2013 07:32
OpenFOAM 1.6-ext git installation on Ubuntu 11.10 x64 Attesz OpenFOAM Installation 45 January 13, 2012 13:38
G95 + CGNS Bruno Main CFD Forum 1 January 30, 2007 01:34

All times are GMT -4. The time now is 02:28.