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

chtMultiRegionSimpleFoam problem

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

Reply
 
LinkBack Thread Tools Display Modes
Old   October 3, 2016, 10:59
Default chtMultiRegionSimpleFoam problem
  #1
Member
 
Join Date: Jul 2013
Posts: 39
Rep Power: 6
cfdsolver1 is on a distinguished road
Hello everyone. I am struggling with chtMultiRegionSimpleFoam recent days and I need someone help. I am trying to solve fluid-solid multi region problem, steady state and incompressible. Which boundary conditions do I need to set at fluid-solid interface(mappedWall)? For instance, for pressure, whatever I select except from uniform value, solver fails with the famous error starts with

Code:
#0  Foam::error::printStack(Foam::Ostream&)
If my problem was not multi-region, I would set fixedFluxPressure boundary condition at walls. If I set it for multi-region, it fails. I have checked all the tutorials and that problems are not suitable for my case.

For temperature, I want k1*dT2/dn = k2*dT2/dn. I found that

Code:
compressible::turbulentTemperatureCoupledBaffleMixed
can be a good option but I am not sure, if this is good or not for incompressible problem. I think I can not create a pressure difference between inlet and outlet due to my boundary conditions I guess, so I have nearly zero velocity after a threshold point.

I am open to any suggestions of yours for inlet, outlet and interface boundary conditions for pressure and temperature for chtMultiRegionSimpleFoam.
cfdsolver1 is offline   Reply With Quote

Old   October 4, 2016, 01:46
Default
  #2
Senior Member
 
Join Date: Sep 2013
Posts: 116
Rep Power: 7
Bloerb is on a distinguished road
the compressible tag is because the solver is compressible. When you choose rhoConst in your thermoPhysicalProperties file it solves incompressible. Hence, this boundary works for incompressible cases as well. You can choose the same boundaries as you would for any other case with only one region. chtmultiregion is essentially two (or more) solvers executed one after another. The only coupling is done by boundary conditions. And the only boundary you can couple by default is the temperature field.

Your problem is not in the fixedFluxPressure on your walls but somewhere deeper.
Bloerb is offline   Reply With Quote

Old   October 4, 2016, 03:08
Default
  #3
Member
 
Join Date: Jul 2013
Posts: 39
Rep Power: 6
cfdsolver1 is on a distinguished road
Dear Bloerb, thanks for your answer. As I know, fixedFluxPressure is evaluated as gradP = (PhihbyA - Phi) / (Sf*Dp). So, when I try to apply this BC, I think Sf or Dp is zero, so it fails. What do you think? How can I solve this problem, if this is my problem? By introducing baffles?
cfdsolver1 is offline   Reply With Quote

Reply

Tags
boundary condition, chtmultiregionsimplefoam

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
UDF compiling problem Wouter Fluent UDF and Scheme Programming 6 June 6, 2012 04:43
Gambit - meshing over airfoil wrapping (?) problem JFDC FLUENT 1 July 11, 2011 05:59
natural convection problem for a CHT problem Se-Hee CFX 2 June 10, 2007 06:29
Adiabatic and Rotating wall (Convection problem) ParodDav CFX 5 April 29, 2007 19:13
Is this problem well posed? Thomas P. Abraham Main CFD Forum 5 September 8, 1999 14:52


All times are GMT -4. The time now is 20:32.