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May 24, 2016, 10:31 |
FloatingObject parameter question
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#1 |
New Member
Evan
Join Date: May 2016
Posts: 23
Rep Power: 10 |
Hi, I'm trying to run a simulation of a 3x3x3 cube in a 100x100x20 environment using the framework of the floatingObject tutorial. I'm just unsure of what the 'innerDistance' and 'outerDistance' are. Here's my dynamicMeshDict file... thanks
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // dynamicFvMesh dynamicMotionSolverFvMesh; motionSolverLibs ("libsixDoFRigidBodyMotion.so"); solver sixDoFRigidBodyMotion; sixDoFRigidBodyMotionCoeffs { patches (floatingObject); innerDistance 0.05; outerDistance 0.35; centreOfMass (50 50 10); // Cuboid dimensions Lx 3.0; Ly 3.0; Lz 3.0; // Density of the solid rho 920; // Cuboid mass mass #calc "$rho*$Lx*$Ly*$Lz"; // Cuboid moment of inertia about the centre of mass momentOfInertia #codeStream { codeInclude #{ #include "diagTensor.H" #}; code #{ scalar sqrLx = sqr($Lx); scalar sqrLy = sqr($Ly); scalar sqrLz = sqr($Lz); os << $mass *diagTensor(sqrLy + sqrLz, sqrLx + sqrLz, sqrLx + sqrLy)/12.0; #}; }; report on; accelerationRelaxation 0.7; |
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July 20, 2016, 16:38 |
innerDistance & outerDistance
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#2 |
Member
Gautami Erukulla
Join Date: Mar 2009
Posts: 71
Rep Power: 17 |
Dear All,
I am simulating a 2D wave tank 15m long and 2m in height (OpenFOAM version 2.3.0). At the center of the wave tank there is floating object 0.5 m long and 0.4 m height, and its half immersed in water. The waves are generated at the inlet using the groovyBC velocity boundary condition. The floating object is provided 3 degree freedom (surge,heave and pitch). The simulation seems to be very sensitive to the innerDistance and outerDistance parameter in the dynamicMeshDict. Large displacements of the floating object distorts the surrounding mesh and crashes the run. I do not seem to understand, how to set a good value for these parameters. I was hoping if any one could guide me with a good approximation for the innerDistance and outerDistance parameters. Thank you. Most&More, Gautama Erukulla. |
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October 20, 2016, 10:46 |
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#3 |
New Member
Abigail Stehno
Join Date: Sep 2015
Posts: 8
Rep Power: 11 |
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Tags |
dynamicmeshdict, floatingobject |
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