icoFoam: Number of unkowns
 

I have two quick questions in the frame of icoFoam:

say, an unstructured pure hexahedral mesh has M number of cells ;

1) Is the number of unknowns for pressure and velocity equal to M and the total number of unknowns equals to 2M?

2) How can one calculate the number of unknowns in general for OpenFOAM applications?

Cheers,
Evren

Velocity is a vector, thus the total number of unknowns will be 4*M.

In general a scalar equation will add M, a vector equation 3*M unknowns.