[levoCFD]

Hi,

I am wondering which measures are generally required to switch from fixed time steps to local time stepping in OpenFOAM. I was expecting this to be a common problem but I could not find any helpful information on it online.

I am currently working with the lagrangian solver simpleReactingParcelFoam and I would like to use local time stepping to reduce the simulation run time as far as possible.

Therefore, I have compared the tutorial cases verticalChannel and verticalChannelLTS in the tutorial directory lagrangian/reactingParcelFoam. I have noticed several differences in the controlDict, fvSchemes and fvSolutions files. One difference is the specification of a maximum Courant number (maxCo) in the fvSolutions.

However, when I run the case verticalChannelLTS with different values for maxCo, it does not influence the run time. I was expecting that for small Courant numbers, the time steps would be decreased resulting in a longer run time.
The same thing applies to the maximum time step maxDeltaT.

Do you know why this is the case?

Best regards