Which Foam for vortex shedding problem
 

Hi all,

if I were interested in modeling vortex shedding behind a cylinder in incompressible flow, which Foam is best to use?

The Re will vary from 60 to 10,000.

Thanks,
Maddy.

You can start with icoFoam, the basic solver for incompressible flow. A more important question is the turbulence model you will use. There are numerous models, you can find more info on http://www.cfd-online.com/Wiki/Turbulence_modeling, but I suggest you also find a good textbook.

icoFoam for lower Reynolds number, pisoFoam or pimpleFoam for higher Reynolds number. However, have in mind that in this Reynolds number range (up to 10000) the flow exhibits a mixed laminar-turbulent behavior which is quite difficult to capture properly with standard RANS turbulence models. I have some experience at higher Reynolds numbers (from 1E05 to 3.6E06) and for such a flow regime some unsteady RANS models do a pretty good job in predicting vortex shedding frequencies and time-averaged drag values.

Regards

V.

Which Foam for vortex shedding problem
 

hi all,

Use icoFoam for Re ranging from 0-300 and turbFoam or pimpleFoam for Re ranging from 300-20000 with SA Model or k-epsilon.


Regards

NAVEEN

hi all

I am interested in vortex shedding at high Reynolds numbers (20.000 to 90.000). I found out that the solver turbfoam is no longer available in OF versions 1.6 and newer (I work with OF 1.7.x).

• Does anybody know why?
• can I import the turbfoam solver to OF 1.7.x?
• Which would be an appropriate alternative that allows me to add heat transfer / temperature (see http://openfoamwiki.net/index.php/Ho...ure_to_icoFoam )

I am new to openFOAM so any help and explanation is appreciated.

best
Uli

Both icoFoam and pimpleFoam can do simulations, and you can chose from a whole range of turbulence models in constant/turbulenceProperties.

hi all,

since icoFoam is a solver for laminar flows I did simulations with pimpleFoam and pisoFoam, which produced similar results.

For any further suggestions see
http://www.cfd-online.com/Forums/mai...frequency.html
maybe we can continue the vortex shedding topic there.

Uli

Hi, I am trying to simulate flow passing over an airfoil with a Reynolds number 60000 , I am modeling it using RANS with SA turbulence model. I am running it using pisoFoam solver and by checking the results, so far it's given good results but the problem is that it is very slow. I wanted to increase the speed of simulations and I read in one of the topics that using pimpleFoam since we can go for higher Courant number is an option. It gave the results very fast but when I check it , there was no vortex shedding and it looked like an average results.

Do you have any idea how I can set the pimpleFoam in order to capture vortex shedding?