Hi,

Is there someone who knows what is this error, and how can I avoid it ?

Error: couldn't allocate fine level coefficient matrix Error object: ()

thk's

this usually comes when u tries to use coupled solver, its been noticed but i don't know the fix for it, change courant number some times it works

Fluent is saying it can't get enough memory from the system so that it can allocate the coefficient matrix.

U need to go for higher processing speed. Ur current configuration is not supporting the mesh size.

Mahesh