adjusting the maxCo during solution
 

Hi. I want for the maxCo to change within the solve due to some criterion. How that can be done?

I already tried just simply assigning a value to it with a line

maxCo=something;

within the .C file; but it didn't work.

You have to set it in system/controlDict

The line
allows changes during runtime, and you may set the value in the line
to something different while the simulation is running.

It is often useful to start with a low value vor maxCo and inreasing it, when the simulated flow gets stable.

Thanks; but I need it to change programmatically (not by me). As you mentioned, I want it to increase and decrease duo to some criteria.