[Franz]

Hello !

I try to model an isothermal laminar flow of a gaz (H₂) inside a long (5m) straight microchannel (square cross section 1mm²).

Boundaries :

Inlet : Flow rate
Outlet : Atmospheric pressure
It is for fuel cell application, so the gaz is consumed along the channel through the top of the domaine. (Is it called a source term ?)

My first problem is to understand if i need a compressible solver as the density of the gaz will change along the channel but the mach number is far from 1 (8E-3). I'm not sure even if i read that : http://www.cfd-online.com/Forums/mai...ible-flow.html

If yes, in the SIMPLE algorithm is it possible to update local densities (i.e on each control volume) with the ideal gas law () after the pressure and velocities correction ?

I don't think it's possible because it doesn't take into account the control volume itself like this expression

What did I miss ?

Thank you for your comments.