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August 9, 2005, 04:48 
thank you very much

#1 
Senior Member

thank you very much


August 9, 2005, 15:50 
I know SimpleFoam allows stead

#2 
Senior Member
Billy
Join Date: Mar 2009
Posts: 167
Rep Power: 9 
I know SimpleFoam allows steady state calculation. What do you want to simulate?


August 9, 2005, 23:11 
i want to simulate the most si

#3 
Senior Member

i want to simulate the most simple case "
"laminar lid driven cavity" thank you very much, 

August 10, 2005, 00:32 
Use simpleFoam, switching off

#4 
Senior Member
Alberto Passalacqua
Join Date: Mar 2009
Location: Ames, Iowa, United States
Posts: 1,910
Rep Power: 27 
Use simpleFoam, switching off turbulence and choosing "laminar" as turbulence model.
Good work, Alberto
__________________
Alberto Passalacqua GeekoCFD  A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats. OpenQBMM  An opensource implementation of quadraturebased moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using. 

August 10, 2005, 10:24 
In icoFoam is already the lid

#5 
Guest
Posts: n/a

In icoFoam is already the lid driven cavity implemented as example/tutorial case. And you
don't have any unnecessary turbulence models. Furthermore take a look into the UserGuide, it describes the cavity case very comprehensive. marcus 

August 11, 2005, 01:08 
but how to simulate a steady p

#6 
Senior Member

but how to simulate a steady problem use the icofoam solver.
i have tried a very large time step with the implicit EULER scheme, but i always divergence. but the implicit scheme shold convenge at any time step 

August 11, 2005, 04:11 
icoFoam uses the PISO pressure

#7 
Senior Member
Join Date: Mar 2009
Posts: 854
Rep Power: 14 
icoFoam uses the PISO pressurevelocity coupling algorithm which is an efficient semiimplicit method for transient simulations but is not stable for very large time steps. This is not a proablem because very large time steps are not appropriate for transient flows.
simpleFoam is for steadystate flows and used the SIMPLE pressurevelocity algorithm which is efficient for this purpose. If you insist on using a transient solver for steadystate flows you will have to write one using the transient SIMPLE algorithm which effectively means substituting the SIMPLE algorithm from simpleFoam into the time loop of icoFoam and introduce a convergence criterion. Although this will be stable for very large timesteps it is not an efficient way to solve steadystate problems. 

August 11, 2005, 06:37 
What would be the best way to

#8 
New Member
Charles Crosby
Join Date: Mar 2009
Location: Cape Town, Western Cape, South Africa
Posts: 5
Rep Power: 9 
What would be the best way to get to a compressible steady solver? sonicTurbFoam needs very small time steps, thus a rather large number of them to get to a steady state solution. How difficult is it likely to be to implement a form of local time stepping?


August 11, 2005, 10:06 
rhoSimpleFoam can be used for

#9 
Senior Member
Join Date: Mar 2009
Posts: 854
Rep Power: 14 
rhoSimpleFoam can be used for subsonic compressible steady flows but for supersonic cases underrelaxation is problematic and local time stepping may be a better option. We are investigating this at the moment.


August 11, 2005, 18:17 
Does anybody have some example

#10 
New Member
Charles Crosby
Join Date: Mar 2009
Location: Cape Town, Western Cape, South Africa
Posts: 5
Rep Power: 9 
Does anybody have some example setup files for rhoSimpleFoam?


March 21, 2006, 04:15 
Hi Henry,
did you mean rhoS

#11 
Member
VVqf
Join Date: Mar 2009
Location: Braunschweig
Posts: 66
Rep Power: 9 
Hi Henry,
did you mean rhoSonicFoam by "rhoSimpleFoam" ? and what did you mean for supersonic cases? did you mean for supersonic compressible steady flows, "rhoSimpleFoam" can also be used by local time stepping as a better option, rather than sonicFoam, which is but a transient solver? 

September 15, 2006, 09:21 
Hi everyone!
Could anyone t

#12 
New Member
taka
Join Date: Mar 2009
Location: Japan
Posts: 7
Rep Power: 9 
Hi everyone!
Could anyone teach me the physical meaning of  fvm::Sp(fvc::div(phi), U) in UEqn.H, and fvc::div(phi/fvc::interpolate(rho)*fvc::interpolate(p))  p*fvc::div(phi/fvc::interpolate(rho)) in hEqn.H of rhoSimpeFoam. Thank you. 

May 12, 2010, 13:08 

#13 
Senior Member
KGN
Join Date: Oct 2009
Location: Chennai, India
Posts: 102
Rep Power: 9 
Hi all,
I am also interested in implementation of local time stepping. Even though its a very very old post, i hope you people will reply. Can you suggest me some guideline to implement local time stepping for "rhoSonicFoam" OpenFOAM 1.6 solver. thanks mecbe 

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