[konsonaut]

Hello,

for open channel flow simulations the following boundary conditions for U and alpha seem to be really appropriate:

U:

inlet
{
type variableHeightFlowRateInletVelocity;
flowRate 0.25;
alpha alpha.water;
value uniform (0 0 0);
}

alpha:

inlet
{
type variableHeightFlowRate;
lowerBound 0;
upperBound 0.9;
value uniform 0;
}

as it is done in some tutorials also.

However, the inletFlux function gives me some percentages (2-3%) lower inlet flow rates compared to the prescribed inflow.

Does someone has any clue why this is so? And how to get a prescribed flow rate?

With best regards,

konsonaut