[ChrisA]

I'm trying to use flowRateInletVelocity to model a jet-in cross flow using a modified rhoCentralFoam solver (to support multiple gas species). I have a 2d model with a jet width of 0.81mm. I'm trying to specify a mass flow rate of 0.0337kg/(m^2*s), my 2d model has an "empty" depth of 0.01m, so I calculate out an equivalent kg/s (since the units for flowRateInletVelocity are kg/s) to be 2.7317e-7 kg/s and put that into my boundary condition.

I also specify the temperature and total pressure at the jet outlet.

My jet velocity BC looks like:

jetIn
{
type flowRateInletVelocity;
flowRate 2.7317e-7; // Volumetric/mass flow rate [m3/s or kg/s]
value uniform (0 0 0); // placeholder
}

The issue I'm having is that when I look at my results in paraview the mass flow rate is much lower than expected. If I take my species mass fraction * rho * Uy at the boundary over the jet I get a peak value of about 0.0115 kg/(m^2*s) and an average value of about 0.009. This is nowhere near the 0.0337 that I calculated the boundary conditions from. Does anyone have any experience with this BC and able to offer some input/advice? I've attached a plot of my mass flow rate in kg/(m^2*s) in paraView across the jet boundary.

mdot.jpg