Previous: Solid body motion Up: Solid body motion Next: Internal motion
This is an automatically generated documentation by LaTeX2HTML utility. In case of any issue, please, contact us at info@cfdsupport.com.
Test case: sloshingTank2D
- This kind of dynamic mesh solves motion of whole mesh as it is
- New inertial forces appear, due to the fluid inertia
- Copy tutorial case sloshingTank2D: # run
# cp -r $FOAM_TUTORIALS/\
multiphase/interFoam/laminar/sloshingTank2D ./ - Test case is already set up
- Case is two-dimensional. The tank is filled up with water and air. The tank sways imitating the movement of sailing boat.
Figure: sloshingTank2D geometry
- Solver for this tutorial test case is interFoam
- Dynamic mesh properties are in dictionary constant/dynamicMeshDict:
dynamicFvMesh dynamicMotionSolverFvMesh; solver solidBody; solidBodyCoeffs { solidBodyMotionFunction SDA; SDACoeffs { CofG (0 0 0); lamda 50; rollAmax 0.22654; rollAmin 0.10472; heaveA 3.79; swayA 2.34; Q 2; Tp 13.93; Tpn 11.93; dTi 0.059; dTp -0.001; } } - Parameter dynamicFvMesh says what dynamic mesh model is used, for this test case: dynamicMotionSolverFvMesh
- An appropriate solver is called solidBody
- Section solidBodyCoeffs sets parameters of solidBody solver
- Parameter solidBodyMotionFunction selects method to be used, for this test case: SDA (Ship Design Analysis) method.
- SDA method describes periodic motion (three degrees of freedom, two translations: heave and sway and one rotation: roll) for the whole object (whole computational mesh). Method parameters are described in source code header file of the method: # cat $FOAM_SRC/dynamicMesh/motionSolvers/displacement/solidBody/
/solidBodyMotionFunctions/SDA/SDA.HDescription Ship design analysis (SDA) 3DoF motion function. Comprising sinusoidal roll (rotation about x), heave (z-translation) and sway (y-translation) motions with changing amplitude and phase. See also Foam::solidBodyMotionFunctions::tabulated6DoFMotion SourceFiles SDA.C \*---------------------------------------------------------------------------*/ #ifndef SDA_H #define SDA_H #include "solidBodyMotionFunction.H" // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // namespace Foam { namespace solidBodyMotionFunctions { /*---------------------------------------------------------------------------*\ Class SDA Declaration \*---------------------------------------------------------------------------*/ class SDA : public solidBodyMotionFunction { // Private data //- Center of gravity vector CofG_; //- Model scale ratio scalar lamda_; //- Max roll amplitude [rad] scalar rollAmax_; //- Min roll amplitude [rad] scalar rollAmin_; //- Heave amplitude [m] scalar heaveA_; //- Sway amplitude [m] scalar swayA_; //- Damping Coefficient [-] scalar Q_; //- Time Period for liquid [sec] scalar Tp_; //- Natural Period of Ship [sec] scalar Tpn_; //- Reference time step [sec] scalar dTi_; //- Incr. in Tp/unit 'dTi'[-] scalar dTp_; - Alternatives to SDA method are following: axisRotationMotion
linearMotion
multiMotion
oscillatingLinearMotion
oscillatingRotatingMotion
rotatingMotion
tabulated6DoFMotion - Run the test case: # ./Allrun
# paraFoam
- Solver for this tutorial test case is interFoam
Figure: Phase fraction alpha1
Previous: Solid body motion Up: Solid body motion Next: Internal motion