code_saturne User's Forum

Hello,
 
I simulate a compressible flow so I use the compressible module. For the use of this module, I have to put a Courant number max (coumax) of 0.4. In the listing files, in the table "Information on the time step" there are 3 criterions :
Courant number Fourier number CFL/MAS
 
What is the number CFL/MAS ? I know that it only exists for compressible flow but I don't know what it represents.
 
Thank you
 
Romain
 

Hello,
CFL/MAS number allows to ensure the positivity of density. It requests to be lower than 1. It is interpreted as an insurance to not create void in the flow.
Regards
Mickaël