[Oliver Stephan]

Good Morning Foamers,
I have some trouble simulating compressible flow through an s-duct, where the mass flow outlet represents an engine.
For any reason, vortices appear at the outlet (see Attachment) and I have no idea where this comes from. Maybe backflow?
I am using rhoSimpleFoam with a k-omega-SST turbulence model
I am grateful for any advice...
Best regards,
Oli

Boundary conditions:
U:
farfield
{
type freestream;
value uniform ( 0.0 0.0 0.0 );
freestreamValue uniform ( 0.0 0.0 0.0 );
}

duct
{
type noSlip;
}

outlet
{
type flowRateInletVelocity;
value uniform ( 0.0 0.0 0.0 );
massFlowRate constant -6.82;
}
___________
P:
farfield
{
type totalPressure;
p0 uniform 100000.0;
value uniform 1e5;
gamma 1.0;
}

duct
{
type zeroGradient;
}

outlet
{
type zeroGradient;
}
___________
T:
farfield
{
type fixedValue;
value uniform 300;
}

duct
{
type fixedValue;
value uniform 300;
}

outlet
{
type zeroGradient;
}

[Bodo1993]

Hi,
I am getting the same issue in my simulations. I use twoLiquidMixingFoam solver. Please let me know if you solved the problem. Thanks.