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-   -   Non-separated flow in rhoCentralFoam (http://www.cfd-online.com/Forums/openfoam-solving/115224-non-separated-flow-rhocentralfoam.html)

VSass March 26, 2013 10:54

Non-separated flow in rhoCentralFoam
 
Hey guys,

i simulated the flow of air over a sphere in Re=1.8 million with rhoCentralFoam, where i supposed to be able to see that the flow behind the sphere would be separated, due to the high Reynolds number. Instead, the flow is stays attached to the sphere, no separation. I used ePsi thermo model and similar BCs like the ones in wedges tutorial.

Does anyone have any idea what may be the problem?

Thanks in advance

fredo490 March 26, 2013 11:41

What is your turbulence model ? How are your inlet properties (turbulence level) ?

VSass March 26, 2013 14:05

I used both laminar and turbulent k-omega models. The destributions of all the quantities look fine everywhere, but i don't get any vortices or separation.

fredo490 March 26, 2013 14:10

Can you post your case files? Put everything except the mesh folder. You can enclose a zip file to the forum ("manage attachment ") .

VSass March 29, 2013 08:19

Sorry for the delay, here are the 0 files for p/T/U

object p;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions [1 -1 -2 0 0 0 0];

internalField uniform 1e+05;

boundaryField
{
GEOM
{
type zeroGradient;
}
FARFIELD
{
type outletInlet;
outletValue uniform 1e+05;
value uniform 1e+05;
}

}

object T;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions [0 0 0 1 0 0 0];

internalField uniform 273;

boundaryField
{
GEOM
{
type zeroGradient;
}
FARFIELD
{
type inletOutlet;
inletValue uniform 273;
value uniform 273;
}
}

object U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions [0 1 -1 0 0 0 0];

internalField uniform (100 0 0);

boundaryField
{
GEOM
{
type fixedValue;
value uniform (0 0 0);
}
FARFIELD
{
type inletOutlet;
inletValue uniform (100 0 0);
value uniform (100 0 0);
}

Also,the thermophysical properties :
object thermophysicalProperties;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

thermoType ePsiThermo<pureMixture<constTransport<specieThermo <hConstThermo<perfectGas>>>>>;

mixture
{
specie
{
nMoles 1;
molWeight 28.96;
}
thermodynamics
{
Cp 1004.5;
Hf 2.544e+06;
}
transport
{
mu 1.8e-05;
Pr 0.7;
}


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