Outlet Boundary Condition for MassFLow at inlet? - BuoyantBoussinesqSimpleFoam
 

Hi
I have imposed the inlet boundary condition:
inlet
{
type flowRateInletVelocity;
massFlowRate constant 0.04;
rho rho;
rhoInlet 1;
}

I had zeroGradient for outlet BC
but receive an error like so:

FOAM FATAL ERROR:
Continuity error cannot be removed by adjusting the outflow.
Please check the velocity boundary conditions and/or run potentialFoam to initialise the outflow.
Total flux : 0.00932974
Specified mass inflow : 0.04
Specified mass outflow : 0
Adjustable mass outflow : 1.59195e-18

I am using buoyantBoussinesqSimpleFoam

any help would be appreciated

Hi,

I use bouyantSimpleFoam and for the U I use

inlet
{
type flowRateInletVelocity;
massFlowRate constant 0.01;
value uniform (0 0 0);
}
outlet
{
type inletOutlet;
value uniform (0 0 0);
inletValue uniform (0 0 0);
}

maybe it could help

Atlan

Hello atlan,

1. Continuity error cannot be removed by adjusting the outflow.
This means you are trying to calculate closed geometry with only inlet field. So to make things flow there must be an outlet, and this is main issue. There are several tutorials with simpleFoam, rhoSimpleFoam, simpleFoam with Boussinesq approximation where outlet have zeroGradient BC.

More BC`s are here: http://foam.sourceforge.net/docs/cpp/a10486.html
Try it, should work.

seav