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September 9, 2016, 02:01 |
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#141 | |
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Last edited by arionfard; September 9, 2016 at 03:15. |
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September 9, 2016, 03:13 |
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#142 | |
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September 9, 2016, 23:23 |
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October 27, 2016, 23:45 |
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#144 |
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Hi!
I want to prescribe the cylinder with this kind of forced motion. Does anyone know how to do this? |
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October 28, 2016, 02:00 |
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#145 |
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October 28, 2016, 02:38 |
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October 28, 2016, 02:41 |
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October 28, 2016, 03:07 |
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October 28, 2016, 04:55 |
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October 28, 2016, 06:45 |
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#150 | |
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Quote:
https://drive.google.com/file/d/0ByG...ew?usp=sharing The circular cylinder is given a vertical displacement specified in "chirp". The first column is time, and next three columns are displacement vector. I'm trying with timeVaryingUniformFixedValue boundary condition for the cylinder wall in "0/pointDisplacement". But it does not work well. I guess it might be due to the displacement time history specified in "chirp" is not continuous from one time step to the next, it behaves like a sudden change in vertical position. For this kind of arbitrary cylinder motion, what is the good way to simulate? |
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October 29, 2016, 23:06 |
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#151 | |
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October 31, 2016, 06:23 |
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#152 | |
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ok
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could you try this in pointDisplacement file. It is actually my one in the ''forced oscillation case'' in OF-2.2.2 Code:
FoamFile { version 2.0; format ascii; class pointVectorField; object pointDisplacement; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // dimensions [0 1 0 0 0 0 0]; internalField uniform (0 0 0); boundaryField { inlet { type fixedValue; value uniform (0 0 0); } outlet { type fixedValue; value uniform (0 0 0); } top { type empty;//fixedValue; //value uniform (0 0 0); } bottom { type empty;//fixedValue; //value uniform (0 0 0); } walls { type fixedValue; //slip; //zeroGradient; value (0 0 0); } cylinder { type oscillatingDisplacement; amplitude (0 0.25 0); omega 1.14040; value uniform (0 0 0); } } // ************************************************************************* // All the best. Maimouna |
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November 1, 2016, 08:39 |
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#153 | |
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April 10, 2017, 19:43 |
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#154 |
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M. Amirul
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Hi Jason - how we want to generate center of mass data before can plot in gnuplot?
Tq Amy Sent from my M631Y using CFD Online Forum mobile app
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Best Regards, maasyraf3 |
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April 22, 2017, 06:31 |
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#155 |
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M. Amirul
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GREETINGS to all Foamers,
My name is Amy which currently are doing my master research project by dealing with oscillating cylinders. I have went through each replies in this thread and its related link provided, but still I think I dont have the answer. I really need your series of advices, in regards with my oscillating circular cylinder in dynamic meshing. I use pimpleDyMFoam, OF 4.0 to solve my case I have provide all the necessary parameters that similar with my experimental works ( actual setup) but after almost 2 weeks, still the simulation in openFoam not favourable to my experiment result. (I attached the video for actual experiment in my university lab) The GIF file : https://www.cfd-online.com/Forums/at...1&d=1492856466 Has uploaded in youtube link: https://youtu.be/V627hD_ktVA I did modify and tried various Reynold Number value in order to see the effect to the flow, but still the same result. It seems that the flow "not so smooth" as per actual. My setup which is mass-spring-damping system are as follows: 1) Diameter of the cylinder is 50 mm ( which equal to 0.05 meter) iwith the total length is 0.65meter. My case only for 1-DOF. 2) The circular cylinder should oscillate (moving) in y-direction only. As the flow passing the cylinder, the lift force from the flow should naturally force the cylinder up and down (viv phenomena) at certain amplitude. 3) System stiffness is 140 N/m. And so I set two spring (70 for each spring) in the openFoam dynamicMeshDict. The sketch by hand as below: Basically I use Code:
- dynamicFvMesh :dynamicMotionSolverFvMesh - motionSolverLibs :("libsixDoFRigidBodyMotion.so") - solver: sixDoFRigidBodyMotion Kinematic viscosity (v) - 1e-06. And so these values I set in transportProperties file Code:
transportModel Newtonian; nu nu [ 0 2 -1 0 0 0 0 ] 1e-06; rho rho [1 -3 0 0 0 0 0] 1000; So, here in 0 file, I set the U 0.3 m/s at inlet and internalField as well. (I dont know it is the right way or not). By using 0.3 m/s, the Reynold number is 15 000. I dont know, this value of Re still valid for my case file since I off the turbulenceProperties. Need helps here. 6) In dynamicMeshDict, we should specify the below: - inner distance and outer distance. I'd like to ask the effect to the oscillation of the cylinder Code:
patches (cylinder); innerDistance 0.3; outerDistance 2; Code:
rho rhoInf; rhoInf 1; Here I attach all the '0' , ' Constant' and 'System' of my setup. And really appreciate helps and assistance from this forum thread. I dont know, it can be my flow setup is wrong, or my dynamicMeshDict or my transportProperties. or else? I hope I can resolve this...really. Thanks in advance all !! Best Regards - Amy amirulasyraf.utm@gmail.com ********************************* My all case Files as below link and quote 0_constant_system_cylinderVIV.zip 0 files U : Code:
FoamFile { version 2.0; format ascii; class volVectorField; object U; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // dimensions [0 1 -1 0 0 0 0]; internalField uniform (0.01 0 0); boundaryField { topAndBottom { type noSlip; } inlet { type fixedValue; value uniform (0.01 0 0); } outlet { type zeroGradient; } frontAndBack { type empty; } cylinder { type movingWallVelocity; value uniform (0 0 0); } } // ************************************************************************* // Code:
{ version 2.0; format ascii; class volScalarField; object p; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // dimensions [0 2 -2 0 0 0 0]; internalField uniform 0; boundaryField { topAndBottom { type zeroGradient; } outlet { type zeroGradient; } inlet { type zeroGradient; } frontAndBack { type empty; } cylinder { type zeroGradient; } } // ************************************************************************* // Code:
FoamFile { version 2.0; format ascii; class pointVectorField; location "0.01"; object pointDisplacement; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // dimensions [0 1 0 0 0 0 0]; internalField uniform (0 0 0); boundaryField { topAndBottom { type uniformFixedValue; uniformValue (0 0 0); } inlet { type uniformFixedValue; uniformValue (0 0 0); } outlet { type uniformFixedValue; uniformValue (0 0 0); } cylinder { type calculated; value uniform (0 0 0); } frontAndBack { type empty; } } Code:
FoamFile { version 2.0; format ascii; class dictionary; object dynamicMeshDict; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // dynamicFvMesh dynamicMotionSolverFvMesh; motionSolverLibs ("libsixDoFRigidBodyMotion.so"); solver sixDoFRigidBodyMotion; diffusivity linear inverseDistance 1 (cylinder); sixDoFRigidBodyMotionCoeffs { patches (cylinder); innerDistance 0.3; outerDistance 2; mass 1.32; centreOfMass (0 0 0); momentOfInertia (0.1 0.1 0.1); orientation ( 1 0 0 0 1 0 0 0 1 ); angularMomentum (0 0 0); g (0 -9.81 0); rho rhoInf; rhoInf 1; report on; solver { type symplectic; } constraints { yLine { sixDoFRigidBodyMotionConstraint line; centreOfRotation (0 0 0); direction (0 1 0); } zAxis { sixDoFRigidBodyMotionConstraint axis; axis (0 0 1); } } restraints { verticalSpring1 { sixDoFRigidBodyMotionRestraint linearSpring; anchor (0 0.20 0.0025); refAttachmentPt (0 0.05 0.0025); stiffness 70; damping 0.08; restLength 0.05; } verticalSpring2 { sixDoFRigidBodyMotionRestraint linearSpring; anchor (0 -0.20 0.0025); refAttachmentPt (0 -0.05 0.0025); stiffness 70; damping 0.08; restLength 0.05; } } } // ************************************************************************* // Code:
FoamFile { version 2.0; format ascii; class dictionary; location "constant"; object transportProperties; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // transportModel Newtonian; nu nu [ 0 2 -1 0 0 0 0 ] 1e-06; rho rho [1 -3 0 0 0 0 0] 1000; // ************************************************************************* Code:
FoamFile { version 2.0; format ascii; class dictionary; location "constant"; object turbulenceProperties; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // simulationType laminar; // ************************************************************************* // Code:
FoamFile { version 2.0; format ascii; class dictionary; location "constant"; object RASProperties; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // RASModel laminar; turbulence off; printCoeffs on; // ************************************************************************* // the controlDict: Code:
FoamFile { version 2.0; format ascii; class dictionary; location "system"; object controlDict; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // application pimpleDyMFoam; startFrom latestTime; startTime 0; stopAt endTime; endTime 60; deltaT 5e-06; writeControl adjustableRunTime; writeInterval 0.1; purgeWrite 0; writeFormat binary; writePrecision 6; writeCompression off; timeFormat general; timePrecision 6; runTimeModifiable true; adjustTimeStep yes; maxCo 0.5; functions { #include "cuttingPlane" } // ************************************************************************* // Code:
FoamFile { version 2.0; format ascii; class dictionary; object decomposeParDict; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // numberOfSubdomains 6; method scotch; // method ptscotch; simpleCoeffs { n (4 1 1); delta 0.001; } hierarchicalCoeffs { n (3 2 1); delta 0.001; order xyz; } manualCoeffs { dataFile "cellDecomposition"; } // ************************************************************************* // Code:
FoamFile { version 2.0; format ascii; class dictionary; location "system"; object fvSchemes; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // ddtSchemes { default Euler; } gradSchemes { default Gauss linear; } divSchemes { default none; div(phi,U) Gauss linear; div((nuEff*dev(T(grad(U))))) Gauss linear; div((nuEff*dev2(T(grad(U))))) Gauss linear; } laplacianSchemes { default Gauss linear corrected; laplacian(diffusivity,cellMotionU) Gauss linear uncorrected; } interpolationSchemes { default linear; } snGradSchemes { default corrected; } fluxRequired { default no; pcorr ; p ; } // ************************************************************************* // Code:
FoamFile { version 2.0; format ascii; class dictionary; location "system"; object fvSolution; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // solvers { pcorr { solver GAMG; tolerance 0.02; relTol 0; smoother GaussSeidel; nPreSweeps 0; nPostSweeps 2; cacheAgglomeration no; nCellsInCoarsestLevel 10; agglomerator faceAreaPair; mergeLevels 1; } p { solver GAMG; tolerance 0; relTol 0.01; smoother GaussSeidel; nPreSweeps 0; nPostSweeps 2; cacheAgglomeration no; nCellsInCoarsestLevel 10; agglomerator faceAreaPair; mergeLevels 1; } pFinal { $p; tolerance 1e-06; relTol 0; } U { solver smoothSolver; smoother symGaussSeidel; tolerance 1e-05; relTol 0.1; } UFinal { $U; tolerance 1e-05; relTol 0; } cellMotionUx { solver PCG; preconditioner DIC; tolerance 1e-08; relTol 0; } cellMotionUxFinal { solver PCG; preconditioner DIC; tolerance 1e-08; relTol 0; } "cellDisplacement.*" { solver GAMG; tolerance 1e-5; relTol 0; smoother GaussSeidel; cacheAgglomeration true; nCellsInCoarsestLevel 10; agglomerator faceAreaPair; mergeLevels 1; } } PIMPLE { correctPhi yes; nOuterCorrectors 2; nCorrectors 1; nNonOrthogonalCorrectors 0; pRefCell 1001; pRefValue 0; } relaxationFactors { fields { } equations { "U.*" 1; } } // ************************************************************************* // The GIF file of the "not so smooth" oscillation oscillatingCylinder.jpg https://www.cfd-online.com/Forums/at...1&d=1492857765 the youtube link for the not so smooth simulation of mine: https://youtu.be/HPNi8obU4aM
__________________
Best Regards, maasyraf3 Last edited by wyldckat; April 23, 2017 at 14:35. Reason: Changed [QUOTE][/QUOTE] to [CODE][/CODE] and merged posts that were a few minutes apart |
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April 22, 2017, 21:20 |
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#156 |
New Member
M. Amirul
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And this is my blockMeshDict file
Code:
FoamFile { version 2.0; format ascii; class dictionary; object blockMeshDict; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // convertToMeters 0.05; vertices ( //z=0 //inner circle (5 0 0) //0 (3.535533906 3.535533906 0) //1 (0 5 0) //2 (-3.535533906 3.535533906 0) //3 (-5 0 0) //4 (-3.535533906 -3.535533906 0) //5 (0 -5 0) //6 (3.535533906 -3.535533906 0) //7 //outer circle (15 0 0) //8 (10.60660172 10.60660172 0) //9 (0 15 0) //10 (-10.60660172 10.60660172 0) //11 (-15 0 0) //12 (-10.60660172 -10.60660172 0) //13 (0 -15 0) //14 (10.60660172 -10.60660172 0) //15 //rectangle (200 0 0) //16 (200 10.60660172 0) //17 (200 50 0) //18 (10.60660172 50 0) //19 (0 50 0) //20 (-10.60660172 50 0) //21 (-25 50 0) //22 (-25 10.60660172 0) //23 (-25 0 0) //24 (-25 -10.60660172 0) //25 (-25 -50 0) //26 (-10.60660172 -50 0) //27 (0 -50 0) //28 (10.60660172 -50 0) //29 (200 -50 0) //30 (200 -10.60660172 0) //31 //z=1 //inner circle (5 0 1) //32 (3.535533906 3.535533906 1) //33 (0 5 1) //34 (-3.535533906 3.535533906 1) //35 (-5 0 1) //36 (-3.535533906 -3.535533906 1) //37 (0 -5 1) //38 (3.535533906 -3.535533906 1) //39 //outer circle (15 0 1) //40 (10.60660172 10.60660172 1) //41 (0 15 1) //42 (-10.60660172 10.60660172 1) //43 (-15 0 1) //44 (-10.60660172 -10.60660172 1) //45 (0 -15 1) //46 (10.60660172 -10.60660172 1) //47 //rectangle (200 0 1) //48 (200 10.60660172 1) //49 (200 50 1) //50 (10.60660172 50 1) //51 (0 50 1) //52 (-10.60660172 50 1) //53 (-25 50 1) //54 (-25 10.60660172 1) //55 (-25 0 1) //56 (-25 -10.60660172 1) //57 (-25 -50 1) //58 (-10.60660172 -50 1) //59 (0 -50 1) //60 (10.60660172 -50 1) //61 (200 -50 1) //62 (200 -10.60660172 1) //63 ); blocks ( hex (1 0 8 9 33 32 40 41) (10 10 1) simpleGrading (1 8 1) //Block 0 hex (2 1 9 10 34 33 41 42) (10 10 1) simpleGrading (1 8 1) //Block 1 hex (3 2 10 11 35 34 42 43) (10 10 1) simpleGrading (1 8 1) //Block 2 hex (4 3 11 12 36 35 43 44) (10 10 1) simpleGrading (1 8 1) //Block 3 hex (5 4 12 13 37 36 44 45) (10 10 1) simpleGrading (1 8 1) //Block 4 hex (6 5 13 14 38 37 45 46) (10 10 1) simpleGrading (1 8 1) //Block 5 hex (7 6 14 15 39 38 46 47) (10 10 1) simpleGrading (1 8 1) //Block 6 hex (0 7 15 8 32 39 47 40) (10 10 1) simpleGrading (1 8 1) //Block 7 hex (8 16 17 9 40 48 49 41) (10 10 1) simpleGrading (2 1 1) //Block 8 hex (9 17 18 19 41 49 50 51) (10 10 1) simpleGrading (2 2 1) //Block 9 hex (10 9 19 20 42 41 51 52) (10 10 1) simpleGrading (1 2 1) //Block 10 hex (11 10 20 21 43 42 52 53) (10 10 1) simpleGrading (1 2 1) //Block 11 hex (23 11 21 22 55 43 53 54) (10 10 1) simpleGrading (1 2 1) //Block 12 hex (24 12 11 23 56 44 43 55) (10 10 1) simpleGrading (1 1 1) //Block 13 hex (25 13 12 24 57 45 44 56) (10 10 1) simpleGrading (1 1 1) //Block 14 hex (26 27 13 25 58 59 45 57) (10 10 1) simpleGrading (1 0.5 1) //Block 15 hex (27 28 14 13 59 60 46 45) (10 10 1) simpleGrading (1 0.5 1) //Block 16 hex (28 29 15 14 60 61 47 46) (10 10 1) simpleGrading (1 0.5 1) //Block 17 hex (29 30 31 15 61 62 63 47) (10 10 1) simpleGrading (2 0.5 1) //Block 18 hex (15 31 16 8 47 63 48 40) (10 10 1) simpleGrading (2 1 1) //Block 19 ); edges ( //inner cylinder surface arc 0 1 (4 3 0) arc 32 33 (4 3 1) arc 1 2 (3 4 0) arc 33 34 (3 4 1) arc 2 3 (-3 4 0) arc 34 35 (-3 4 1) arc 3 4 (-4 3 0) arc 35 36 (-4 3 1) arc 4 5 (-4 -3 0) arc 36 37 (-4 -3 1) arc 5 6 (-3 -4 0) arc 37 38 (-3 -4 1) arc 6 7 (3 -4 0) arc 38 39 (3 -4 1) arc 7 0 (4 -3 0) arc 39 32 (4 -3 1) //outer cylinder surface arc 8 9 (12 9 0) arc 40 41 (12 9 1) arc 9 10 (9 12 0) arc 41 42 (9 12 1) arc 10 11 (-9 12 0) arc 42 43 (-9 12 1) arc 11 12 (-12 9 0) arc 43 44 (-12 9 1) arc 12 13 (-12 -9 0) arc 44 45 (-12 -9 1) arc 13 14 (-9 -12 0) arc 45 46 (-9 -12 1) arc 14 15 (9 -12 0) arc 46 47 (9 -12 1) arc 15 8 (12 -9 0) arc 47 40 (12 -9 1) ); boundary ( inlet { type patch; faces ( (22 23 55 54) (23 24 56 55) (24 25 57 56) (25 26 58 57) ); } outlet { type patch; faces ( (30 31 63 62) (31 16 48 63) (16 17 49 48) (17 18 50 49) ); } topAndBottom { type patch; faces ( (18 19 51 50) (19 20 52 51) (20 21 53 52) (21 22 54 53) (26 27 59 58) (27 28 60 59) (28 29 61 60) (29 30 62 61) ); } cylinder { type wall; faces ( (1 0 32 33) (2 1 33 34) (3 2 34 35) (4 3 35 36) (5 4 36 37) (6 5 37 38) (7 6 38 39) (0 7 39 32) ); } frontAndBack { type empty; faces ( //circular faces (0 1 9 8) (32 40 41 33) (1 2 10 9) (33 41 42 34) (2 3 11 10) (34 42 43 35) (3 4 12 11) (35 43 44 36) (4 5 13 12) (36 44 45 37) (5 6 14 13) (37 45 46 38) (6 7 15 14) (38 46 47 39) (7 0 8 15) (39 47 40 32) //rectangular faces (8 9 17 16) (40 48 49 41) (9 19 18 17) (41 49 50 51) (9 10 20 19) (41 51 52 42) (10 11 21 20) (42 52 53 43) (11 23 22 21) (43 53 54 55) (11 12 24 23) (43 55 56 44) (12 13 25 24) (44 56 57 45) (13 27 26 25) (45 57 58 59) (13 14 28 27) (45 59 60 46) (14 15 29 28) (46 60 61 47) (15 31 30 29) (47 61 62 63) (15 8 16 31) (47 63 48 40) ); } ); mergePatchPairs ( ); // ************************************************************************* // Or because of my turbulence is "off" mode?
__________________
Best Regards, maasyraf3 Last edited by wyldckat; April 23, 2017 at 14:34. Reason: Changed [QUOTE][/QUOTE] to [CODE][/CODE] and merged posts that were a few minutes apart |
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July 15, 2017, 09:15 |
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#157 |
New Member
aref shahryari
Join Date: Jul 2017
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Hi all!
I'm working with an example in OLAFOAM OF300_400 named wavemakerFlume. I've added a body (caisson) to the domain which has no motion yet. Now I want to add a 6-DOF motion to the body that moves with the wave in additional to an oscillating flap (wave maker that existed in the example before) and have two different kinds of movement. Does anybody have any idea how to set dynamicMeshDict file? |
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October 28, 2017, 19:22 |
How to apply the [B]moveDynamicMesh[/B] solver to sixDoFRigidBody dynamic mesh solver
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#158 | |
New Member
Jianming
Join Date: Dec 2016
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Quote:
Thanks |
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October 7, 2020, 02:02 |
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#159 | |
Member
Sachin
Join Date: Aug 2014
Location: India
Posts: 84
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Quote:
Could you share the case setup? |
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February 6, 2022, 15:47 |
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#160 | |
Member
zink
Join Date: Oct 2015
Posts: 30
Rep Power: 10 |
Quote:
Hi, Can anyone answer the following queries: Should the value of inner distance be equal to diameter or radius? What’s the recommended value of outerDistance? The boundary of whole domain or somewhat in between the cylinder and main boundary ? Should the constraint of line be applied for 2-DoF? When I removed the line constraint condition, the simulation diverges… do I need to refine the mesh ? Should the value of refAttachmentPt be equal to cylinder diameter or zero? Will really appreciate your guidance... |
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