CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

pisoFoam, pimpleFoam - Fluent user's questions

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   September 4, 2013, 05:26
Default pisoFoam, pimpleFoam - Fluent user's questions
  #1
Senior Member
 
RodriguezFatz's Avatar
 
Philipp
Join Date: Jun 2011
Location: Germany
Posts: 1,297
Rep Power: 27
RodriguezFatz will become famous soon enough
Hi all,

Again I have some beginner's questions about the solver...
After mastering the steady-state simulation I now want to run a time-dependent SAS simulation.
I am playing around with the two solvers pisoFoam and pimpleFoam.
1) I am not quite sure that I understood pisoFoam correctly, but what I think is, that it does not iterate the nonlinear terms, is that correct? So momentum equation is solved at the beginning, all other iterations are just used to solve for continuity equation?
2) When does that make sense? Time-steps have to be really small right? What about a bluff body / vortex simulation. Let's say, I have maybe 20-50 time steps per period. Do you think that is a case, where I can use pisoFoam?
3) For me it looks like that the solver pimpleFoam is, what Fluent calls "Piso", because outer iterations are introduced to pisoFoam, where the nonlinear terms are interated. Can somebody confirm that?

4) A somehow different topic: When I use "omegaWallFunction" as boundary condition in a fine y+=1 grid, the solver asks me to set an additional "value" anyway. But why? Is this just for initialization?

Thanks for any help,
Philipp.
__________________
The skeleton ran out of shampoo in the shower.
RodriguezFatz is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
pimpleFoam vs simpleFoam vs pisoFoam vs icoFoam? phsieh2005 OpenFOAM Running, Solving & CFD 45 March 22, 2021 10:14
Error in run Batch file saba1366 CFX 4 February 10, 2013 02:15
unsteady LES pisoFoam questions garrison OpenFOAM Running, Solving & CFD 13 August 17, 2012 21:12
CFD beginner:- Help needed, general questions on Free jets? (Fluent 5.2.3) Wong, R.Y.T. Main CFD Forum 5 October 22, 2010 01:51
Help!!! Fluent 5.0 users! Jayanti Sinha Main CFD Forum 1 November 9, 1999 18:04


All times are GMT -4. The time now is 10:32.