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

Reynolds stress pimpleFoam

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

Reply
 
LinkBack Thread Tools Display Modes
Old   October 16, 2015, 12:16
Default Reynolds stress pimpleFoam
  #1
New Member
 
Marta
Join Date: Jul 2015
Location: Rome
Posts: 7
Rep Power: 2
Marta_ is on a distinguished road
Hi everyone,
I'm running the case of turbulent flow around a square cylinder , with LES model. The solver is pimpleFoam.

Does anyone know how I can extract instantaneous Reynolds stress ?

Thanks a lot
Marta
Marta_ is offline   Reply With Quote

Old   October 16, 2015, 12:35
Default
  #2
Member
 
Michele Lopez
Join Date: Oct 2015
Location: Bari, IT
Posts: 46
Rep Power: 2
lpz_michele is on a distinguished road
just take a look here:

http://cfd.direct/openfoam/user-guid...ard-utilities/

post-processing
lpz_michele is offline   Reply With Quote

Old   October 17, 2015, 04:49
Default
  #3
Member
 
Join Date: Jun 2012
Posts: 91
Rep Power: 5
Bazinga is on a distinguished road
I tried the R utility for pimpleFoam and it didn't work with the error that it is only valid turbulence models RASModel or laminar.

Are you running LES? You can get the resolved Reynolds stresses by using the functions probes or fieldsAverage + UPrime2Mean in the controlDict file.
Bazinga is offline   Reply With Quote

Old   October 17, 2015, 05:44
Default
  #4
New Member
 
Marta
Join Date: Jul 2015
Location: Rome
Posts: 7
Rep Power: 2
Marta_ is on a distinguished road
Thanks Bazinga,
I also tried the R utility with the same result. And I just checking what came out using UPrime2Mean in the controlDict, setting outputControl: timeStep.

I would need instantaneous Re stress without no averaging..

Marta
Marta_ is offline   Reply With Quote

Old   October 17, 2015, 05:47
Default
  #5
New Member
 
Marta
Join Date: Jul 2015
Location: Rome
Posts: 7
Rep Power: 2
Marta_ is on a distinguished road
Thanks Ipz_michele,
the better way for a while seems to run it again using the functions in the controlDirect.

Marta
Marta_ is offline   Reply With Quote

Old   October 17, 2015, 05:50
Default
  #6
Member
 
Join Date: Jun 2012
Posts: 91
Rep Power: 5
Bazinga is on a distinguished road
The only option i am aware of to get the instantaneous values of the Reynolds stresses is to use probes for the velocity. You need to define them before you start the simulation for each point where you wanna obtain the stresses. From the time history of the velocity you can get the stresses.
Bazinga is offline   Reply With Quote

Old   October 17, 2015, 06:07
Default
  #7
New Member
 
Marta
Join Date: Jul 2015
Location: Rome
Posts: 7
Rep Power: 2
Marta_ is on a distinguished road
Thanks for your help.
Actually I'm trying to find out a way to have the stresses for each point of the grid.
(I need them as source for the acoustic field)
Marta_ is offline   Reply With Quote

Old   October 17, 2015, 06:09
Default
  #8
Member
 
Join Date: Jun 2012
Posts: 91
Rep Power: 5
Bazinga is on a distinguished road
Keep us updated if you find a good solution
Bazinga is offline   Reply With Quote

Old   October 21, 2015, 04:17
Default
  #9
New Member
 
Marta
Join Date: Jul 2015
Location: Rome
Posts: 7
Rep Power: 2
Marta_ is on a distinguished road
Hi,
so far to get the instantaneous Re stress I tried to add two functions in the controlDict: turbulenceFields (that should store R on the mesh) and writeRegisteredObject.

I need to verify what came out. I obtained a symmetric tensor for each time, on each point of the grid.

I also should say that I'm very new on openFoam, so I easily go wrong.
Marta_ is offline   Reply With Quote

Reply

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
[ANSYS Meshing] Error in Workbench "Unable to attach to geometry file" Jeremie84 ANSYS Meshing & Geometry 67 February 24, 2016 07:55
"Error in subroutine GETCORE": simulation of an turbine and reynolds stress models nikn CFX 5 July 12, 2015 06:05
New implemented algebraic Reynolds stress model volker OpenFOAM 13 October 21, 2013 00:01
Reynolds Stress Models Jade M Main CFD Forum 0 April 21, 2010 16:38
Reynolds Stress Boundary Conditions tstorm FLUENT 0 July 27, 2009 14:44


All times are GMT -4. The time now is 10:01.