[gbettega]

Hello Forum,
please, consider the following CFL settings, in a .cfg file:

% -----------
% CFL number
% -----------
CFL_NUMBER= 100

% ------------------------------------------------------------------
% CFL adaptation ON
% factor down, factor up, CFL minimum, CFL maximum, limit tolerance
% ------------------------------------------------------------------
CFL_ADAPT= YES
CFL_ADAPT_PARAM= ( 0.1, 1.1, 1.0, 100, 0.001)

Questions:

1) at the very beginning of the run what is the CFL number?
The calculation starts with CFL_NUMBER= 100, or CFL minimum?

2) what happens if CFL_NUMBER > CFL maximum or CFL_NUMBER < CFL minimum
(example:

CFL_NUMBER= 200
CFL_ADAPT= YES
CFL_ADAPT_PARAM= ( 0.1, 1.1, 1.0, 100, 0.001)
)

Thank you for your help
Giovanni

[bigfootedrockmidget]

1. the initial CFL is CFL_NUMBER
2. the initial CFL is bounded using CFL=max(min(CFL_NUMBER,CFL_MAX), CFL_MIN)
3. When CFL hits the bounds, it stays at the bounds unless the simulation destabilizes again.
4. you can observe what happens using SCREEN_OUTPUT= AVG_CFL