Dual time step implementation in openfoam
 

I'm using openfoam dealing with CHT solver for some real industual cases and I discover that the implicit time step schemes available in Foam are very time consuming and severely limit the increasing of the CFL. So looking to implementing something that can enhance the computational time, I discover implementing the dual time step can considerably enhance the overall computational time.

I would like to have some explanations about this.

1) Can the dual time step implementation be adapted to unsteady CHT time scheme (PISO) in openfoam, because mots of the papers on it talk about density-based solver. For me, I would like to just replace the time scheme in this CHT solver by dual time step based

2) Where to implement this dual time step ? At the same place where Backward and Euler time step are implemented in openfaom?


Thanks !

Have a look at https://github.com/Unofficial-Extend...dDualDdtScheme

That is a way to do it.