[yuno]

the case dir : `$FOAM_TUTORIALS/multiphase/interDyMFoam/ras/floatingObject` for 3.0.1
`$FOAM_TUTORIALS/multiphase/interFoam/RAS/floatingObject` for 1912
the differences between these case :
================================= BEGIN: alpha.water ==============================
4,5c4,5
< | \\ / O peration | Version: 3.0.1 |
< | \\ / A nd | Web: www.OpenFOAM.org |
---
> | \\ / O peration | Version: v1912 |
> | \\ / A nd | Website: www.openfoam.com |

================================= END: alpha.water =============================

================================= BEGIN: epsilon ==============================
4,5c4,5
< | \\ / O peration | Version: 3.0.1 |
< | \\ / A nd | Web: www.OpenFOAM.org |
---
> | \\ / O peration | Version: v1912 |
> | \\ / A nd | Website: www.openfoam.com |

================================= END: epsilon =============================

================================= BEGIN: k ==============================
4,5c4,5
< | \\ / O peration | Version: 3.0.1 |
< | \\ / A nd | Web: www.OpenFOAM.org |
---
> | \\ / O peration | Version: v1912 |
> | \\ / A nd | Website: www.openfoam.com |

================================= END: k =============================

================================= BEGIN: nut ==============================
4,5c4,5
< | \\ / O peration | Version: 3.0.1 |
< | \\ / A nd | Web: www.OpenFOAM.org |
---
> | \\ / O peration | Version: v1912 |
> | \\ / A nd | Website: www.openfoam.com |

================================= END: nut =============================

================================= BEGIN: pointDisplacement ==============================
4,5c4,5
< | \\ / O peration | Version: 3.0.1 |
< | \\ / A nd | Web: www.OpenFOAM.org |
---
> | \\ / O peration | Version: v1912 |
> | \\ / A nd | Website: www.openfoam.com |

================================= END: pointDisplacement =============================

================================= BEGIN: p_rgh ==============================
4,5c4,5
< | \\ / O peration | Version: 3.0.1 |
< | \\ / A nd | Web: www.OpenFOAM.org |
---
> | \\ / O peration | Version: v1912 |
> | \\ / A nd | Website: www.openfoam.com |
31,36d30
< U U;
< phi phi;
< rho rho;
< psi none;
< gamma 1;
< value uniform 0;

================================= END: p_rgh =============================

================================= BEGIN: U ==============================
4,5c4,5
< | \\ / O peration | Version: 3.0.1 |
< | \\ / A nd | Web: www.OpenFOAM.org |
---
> | \\ / O peration | Version: v1912 |
> | \\ / A nd | Website: www.openfoam.com |
26,27c26
< type fixedValue;
< value uniform (0 0 0);
---
> type noSlip;

================================= END: U =============================

================================= BEGIN: dynamicMeshDict ==============================
4,5c4,5
< | \\ / O peration | Version: 3.0.1 |
< | \\ / A nd | Web: www.OpenFOAM.org |
---
> | \\ / O peration | Version: v1912 |
> | \\ / A nd | Website: www.openfoam.com |
13c13
< object motionProperties;
---
> object dynamicMeshDict;
19c19
< motionSolverLibs ("libsixDoFRigidBodyMotion.so");
---
> motionSolverLibs (sixDoFRigidBodyMotion);
21c21
< solver sixDoFRigidBodyMotion;
---
> motionSolver sixDoFRigidBodyMotion;
37c37
< rho 500;
---
> rhoSolid 500;
40c40
< mass #calc "$rho*$Lx*$Ly*$Lz";
---
> mass #eval{ $rhoSolid*$Lx*$Ly*$Lz };
62a63
> //accelerationDamping 0;

================================= END: dynamicMeshDict =============================

================================= BEGIN: g ==============================
4,5c4,5
< | \\ / O peration | Version: 3.0.1 |
< | \\ / A nd | Web: www.OpenFOAM.org |
---
> | \\ / O peration | Version: v1912 |
> | \\ / A nd | Website: www.openfoam.com |

================================= END: g =============================

================================= BEGIN: transportProperties ==============================
4,5c4,5
< | \\ / O peration | Version: 3.0.1 |
< | \\ / A nd | Web: www.OpenFOAM.org |
---
> | \\ / O peration | Version: v1912 |
> | \\ / A nd | Website: www.openfoam.com |
23,24c23,24
< nu [0 2 -1 0 0 0 0] 1e-06;
< rho [1 -3 0 0 0 0 0] 998.2;
---
> nu 1e-06;
> rho 998.2;
30,31c30,31
< nu [0 2 -1 0 0 0 0] 1.48e-05;
< rho [1 -3 0 0 0 0 0] 1;
---
> nu 1.48e-05;
> rho 1;
34c34
< sigma [1 0 -2 0 0 0 0] 0;
---
> sigma 0;

================================= END: transportProperties =============================

================================= BEGIN: turbulenceProperties ==============================
4,5c4,5
< | \\ / O peration | Version: 3.0.1 |
< | \\ / A nd | Web: www.OpenFOAM.org |
---
> | \\ / O peration | Version: v1912 |
> | \\ / A nd | Website: www.openfoam.com |

================================= END: turbulenceProperties =============================

================================= BEGIN: blockMeshDict ==============================
4,5c4,5
< | \\ / O peration | Version: 3.0.1 |
< | \\ / A nd | Web: www.OpenFOAM.org |
---
> | \\ / O peration | Version: v1912 |
> | \\ / A nd | Website: www.openfoam.com |
17c17
< convertToMeters 1;
---
> scale 1;

================================= END: blockMeshDict =============================

================================= BEGIN: controlDict ==============================
4,5c4,5
< | \\ / O peration | Version: 3.0.1 |
< | \\ / A nd | Web: www.OpenFOAM.org |
---
> | \\ / O peration | Version: v1912 |
> | \\ / A nd | Website: www.openfoam.com |
18c18
< application interDyMFoam;
---
> application interFoam;
30c30
< writeControl adjustableRunTime;
---
> writeControl adjustable;
40c40
< writeCompression uncompressed;
---
> writeCompression off;

================================= END: controlDict =============================

================================= BEGIN: decomposeParDict ==============================
4,5c4,5
< | \\ / O peration | Version: 3.0.1 |
< | \\ / A nd | Web: www.OpenFOAM.org |
---
> | \\ / O peration | Version: v1912 |
> | \\ / A nd | Website: www.openfoam.com |
13d12
< location "system";
21,42d19
<
< simpleCoeffs
< {
< n (2 2 1);
< delta 0.001;
< }
<
< hierarchicalCoeffs
< {
< n (2 2 1);
< delta 0.001;
< order xyz;
< }
<
< manualCoeffs
< {
< dataFile "";
< }
<
< distributed no;
<
< roots ( );

================================= END: decomposeParDict =============================

================================= BEGIN: fvSchemes ==============================
4,5c4,5
< | \\ / O peration | Version: 3.0.1 |
< | \\ / A nd | Web: www.OpenFOAM.org |
---
> | \\ / O peration | Version: v1912 |
> | \\ / A nd | Website: www.openfoam.com |
20c20
< default CrankNicolson 0.9;
---
> default CrankNicolson 0.5;

================================= END: fvSchemes =============================

================================= BEGIN: fvSolution ==============================
4,5c4,5
< | \\ / O peration | Version: 3.0.1 |
< | \\ / A nd | Web: www.OpenFOAM.org |
---
> | \\ / O peration | Version: v1912 |
> | \\ / A nd | Website: www.openfoam.com |
22c22
< nAlphaCorr 2;
---
> nAlphaCorr 3;
28c28
< alphaApplyPrevCorr true;
---
> alphaApplyPrevCorr yes;
45,51c45
< nPreSweeps 0;
< nPostSweeps 2;
< nFinestSweeps 2;
< cacheAgglomeration false;
< nCellsInCoarsestLevel 10;
< agglomerator faceAreaPair;
< mergeLevels 1;
---
> cacheAgglomeration no;
65,71d58
< nPreSweeps 0;
< nPostSweeps 2;
< nFinestSweeps 2;
< cacheAgglomeration true;
< nCellsInCoarsestLevel 10;
< agglomerator faceAreaPair;
< mergeLevels 1;
85,90d71
< nPostSweeps 2;
< nFinestSweeps 2;
< cacheAgglomeration true;
< nCellsInCoarsestLevel 10;
< agglomerator faceAreaPair;
< mergeLevels 1;

================================= END: fvSolution =============================

================================= BEGIN: setFieldsDict ==============================
4,5c4,5
< | \\ / O peration | Version: 3.0.1 |
< | \\ / A nd | Web: www.OpenFOAM.org |
---
> | \\ / O peration | Version: v1912 |
> | \\ / A nd | Website: www.openfoam.com |

================================= END: setFieldsDict =============================

================================= BEGIN: topoSetDict ==============================
4,5c4,5
< | \\ / O peration | Version: 3.0.1 |
< | \\ / A nd | Web: www.OpenFOAM.org |
---
> | \\ / O peration | Version: v1912 |
> | \\ / A nd | Website: www.openfoam.com |
25,28c25
< sourceInfo
< {
< box (0.35 0.35 0.1) (0.65 0.55 0.6);
< }
---
> box (0.35 0.35 0.1) (0.65 0.55 0.6);

================================= END: topoSetDict =============================

After calculation, use the position of "centre of mass" to plot following figure:






motionX.png

motionY.png

motionZ.png
Question: which is right or none?