About the pressure coefficients

Wong

Hi all, For the pressure coefficients

Pressure Coefficient The mass flow through the opening is: M" = C * (Pext - Pint)

when different values are used the CFD computation will definetely different,say,why not use 2 or 3 instead of 1 for the coefficients?

if pressure BC is used for the outlets the mass flow rate is not known beforehand how do you determine this pressure coefficient?when 1 is used what happens then? does that mean the mass=1.0(Pext-Pint) always?

would somebody gives me some details about how to determine the coefficents for pressure boundary conditions?