[totalart]

Hi,

While I was running LTSinterfoam to calculate ship resistance, I found something funny. I just used Wigley tutorial and changed hullform and made meshes finer. But water level starts rising and ship is almost sinking at the time 15000s. My alpha1 is following(same with Wigley tutorial). Anyone has idea??? I uploaded screenshot at time step 0, 8000 and 15000.


/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.1.x |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class volScalarField;
location "0";
object alpha;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dimensions [0 0 0 0 0 0 0];
internalField uniform 0;
boundaryField
{
inlet
{
type calculated;
value uniform 0;
}
outlet
{
type zeroGradient;
}
sides
{
type symmetryPlane;
}
atmosphere
{
type inletOutlet;
inletValue uniform 0;
value uniform 0;
}
hull_patch0
{
type zeroGradient;
}
}
// ************************************************** *********************** //


ALPHA_T0.jpg

ALPHA_T8000.jpg

ALPHA_T15000.jpg

And can anyone tell me how to set the time step for LTSinterfoam? I think it's different from interfoam, therefore, we don't need to keep CFL below 1.0.

Youngkook Kim

[haze_1986]

did you try reducing the time step size?

[totalart]

Sorry, I didn't notice your posting. As I mentioned, it is LTS(Local Time Stepping) solver. Therefore, the time step in controlDict is no meaning. I set MaxCo up to 0.1 but there was no change... It happens for some cases while others are okay... I couldn't find the reason yet.