| arieljeds |
April 18, 2017 07:06 |
Having a lot of trouble for a short wavelengths
4 Attachment(s)
Hi all,
I am running free surface flow around a vertical surface piercing cylinder. I am having no trouble for longer wavelengths (smaller diameter to wavelength ratio) but am having a lot of trouble for a short wavelength (wavelength = 2.4 m, diameter = 0.5, waveheight = 0.25).
I am trying to use minimum 50 cells per wavelength and 8 per wave height, which have been plenty for previous simulations.
My constant/waveProperties.input file looks like this:
Code:
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 1.5 |
| \\ / A nd | Web: http://www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object environmentalProperties;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
seaLevel 0.00;
// A list of the relaxation zones in the simulation. The parameters are given
// in <name>Coeffs below.
relaxationNames (inlet outlet);
initializationName outlet;
//pName p_rgh;
inletCoeffs
{
//waveType potentialCurrent;
//U ( 0.6 0 0 );
//Tsoft 0;
waveType stokesFirst; // Regular waves
depth 2.5; // Water Depth
period 1.25; // Wave period
phi 0.00000; // Phase
direction (1.0 0.0 0.0); // Direction of incoming waves
height 0.25; // Wave height in meters
Tsoft 0.0;
relaxationZone
{
relaxationScheme Spatial;
relaxationShape Rectangular;
beachType Empty;
alphaCoefficient 1;
relaxType INLET;
startX ( -7.2 -3.5 0.0);
endX ( -3.6 3.5 0.0);
orientation (1.0 0.0 0.0);
}
};
outletCoeffs
{
waveType potentialCurrent;
U (0 0 0);
Tsoft 0;
relaxationZone
{
relaxationScheme Spatial;
relaxationShape Rectangular;
beachType Empty;
alphaCoefficient 1;
relaxType OUTLET;
startX ( 4.5 -3.5 0.0);
endX ( 7.2 3.5 0.0);
orientation (1.0 0.0 0.0);
}
};
// ************************************************************************* //
The issue appears to be with the mesh (or perhaps the relaxation zones??) but the mesh isn't too bad (max aspect ratio 5.6, see attached image). I've attached an image of the contour plot of velocity at alpha.water = 0.5.
Any advice on what could be causing these problems?? |
