[pintu0101]

i am solving a flow over cylinder problem with fine mesh using pimplefoam.
the courant no increases rapidly after each time iteration and the simulation stops.
how to fix this problem.

[piu58]

Originally Posted by pintu0101

i am solving a flow over cylinder problem with fine mesh using pimplefoam.
the courant no increases rapidly after each time iteration and the simulation stops.
how to fix this problem.

You have to lower the time step or use the Co control.

[pintu0101]

sir, thanks for the suggestion.
but we are using pimplefoam over icofoam so that we can give large time steps.

[piu58]

Originally Posted by pintu0101

sir, thanks for the suggestion.
but we are using pimplefoam over icofoam so that we can give large time steps.

Pimplefoamhas the maxCo autoamtic:

set in controlDict

maxCo           0.1;

or any other value.

[Tobi]

Hi all,

• This is not a bug of openfaom so I will move this thread (just as an information)
• pimpleFoam allows to have much larger values for the Courant number than 1 but you have to use the PIMPLE algorithm correct
• If you don't know how to use it, you can find an explanation in my book (http://www.holzmann-cfd.de/index.php...s-and-openfoam)
• Co > 1 requires the change of fvSolutions file in the manner I explained in the above book (its an own chapter)
• In addition, your mesh can make problems

Good luck.
By the way, depending on the problem, you are not able to increase the Courant number as much as you want.