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restriction coefficients in dynamicMeshDict

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Old   June 12, 2018, 18:34
Default restriction coefficients in dynamicMeshDict
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Jiahui Li
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Dear Foamers,
I want to run an interFoam case which looks like the DTCHull case in tutorial. I don't know how the coefficients are determined in translationDamper and rotationDamper in dynamicMeshDict. Any ideas?
Thank you!
Here is the dynamicMeshDict file.
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 5 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object dynamicMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dynamicFvMesh dynamicMotionSolverFvMesh;

motionSolverLibs ("librigidBodyMeshMotion.so");

solver rigidBodyMotion;

rigidBodyMotionCoeffs
{
report on;

solver
{
type Newmark;
}

accelerationRelaxation 0.4;

bodies
{
hull
{
type rigidBody;
parent root;

centreOfMass (-0.0157226 0 -0.008128); //distance from towing point to CoG
mass 50.757; //half mass
inertia (1.7979 0 0 10.46995 0 10.46995); //(Ixx Ixy(0) Ixz(0) Iyy Iyz(0) Izz) half hull
transform (1 0 0 0 1 0 0 0 1) (0.0157226 0 0.008128); //towing point

joint
{
type composite;
joints
(
{
type Pz;
}
{
type Ry;
}
);
}

patches (hull);
innerDistance 0.3;
outerDistance 1.0;
}
}

restraints
{
translationDamper
{
type linearDamper;
body hull;
coeff 8596;
}

rotationDamper
{
type sphericalAngularDamper;
body hull;
coeff 11586;
}
}



}


// ************************************************** *********************** //
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Old   June 13, 2018, 18:23
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Tobias Holzmann
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Hi,


please use code tags in order to have a nice and readable style. I refer you to the openfoamwiki.net. You will get the answer there.
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Old   June 19, 2018, 11:37
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Jiahui Li
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Thank you Tobi, sorry for the late reply. The website is really helpful.
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