[Mirage12]

I would like to use SIMPLE algorithm for transit simulation.

My problem : I could not use IcoFoam oder PiscoFoam..because the the solvers are crashing. (the mesh could be the reason).

So i thought, i run a simulation as a steady case ( to stabilyse the case ) using simpleFoam, after some seconds, i want to run the simulation as transient case..

Normally for the steady-case, we use :

ddtSchemes
{
    default         steadyState;
}

Can i change the dttSchemes :

ddtSchemes
{
    default         Euler;
}

to change my simulation from steady to transient after some seconds?

Thank you

[Lieven]

Changing the ddtSchemes-entry wouldn't affect your simulation at all. The momentum equation in the simpleFoam solver does not include the time derivative so the ddtSchems-entry is even not used.

In principle you could add the time derivative to the equation, but with the simple algorithm you will always be stuck with under relaxation. So you cannot do proper time integration. So use the piso algorithm for transient simulations.

Cheers,

L

[Mirage12]

Thanks Lieven