| dnl_xr |
March 4, 2024 15:09 |
MRF-Boundary Condition U and equivalent for SRF Urel
Hei,
i have a hard time bc I have to do a MRF and a SRF Simulation of a pump turbine- in my MRF my U look like this:
Code:
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: v2012 |
| \\ / A nd | Website: www.openfoam.com |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class volVectorField;
object U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dimensions [0 1 -1 0 0 0 0];
internalField uniform (0 0 0);
boundaryField
{
IF_LAUF_LEIT
{
type cylindricalInletVelocity;
axis (0 0 1);
origin (0 0 0);
axialVelocity constant 0;
radialVelocity constant -10;
rpm constant 800;;
value uniform (0 0 0);
}
IF_LAUF_SAUGROHR
{
type zeroGradient;
}
"(cP_cyclicA|cP_cyclicB)"
{
type cyclic;
}
"(NABE|KRANZ|SCHAUFEL)"
{
type fixedValue;
value uniform (0 0 0); //Wenn hier alle 3 Null stehen dann dreht es sich mit omega
}
}
// ************************************************************************* //
the simulation looks goof to me. But I don't understand what the radial component exactly is. is the 10 m/s a velocity in Cartesian or cylindrical components? I think in cylindrical bc you have to define axial and radialvelocity. How can I understand the 10 m/s in radial direction? is this an absolut velocity or a relativ?
how can I find the equivalent for Urel for the SRF simulation.
I found this in on of the tutorials
Code:
dimensions [0 1 -1 0 0 0 0];
internalField uniform (0 0 0);
boundaryField
{
IF_LAUF_LEIT
{
type SRFVelocity;
inletValue uniform (-10 0 0);
relative no;
value uniform (0 0 0);
}
everything else stays the same as in the MRF.
what exactly is the inlet value? and do I need to put relativ yes or no?
To compare both simulation I need equal BC... But I don't understand if the SRFVelocity Vektor is in cartesian coordinates or also in cylindrical like the BC at the MRF ?
Can someone help me please...:confused: |
