- Видео 12
- Просмотров 25 058
F. L. Y
Добавлен 1 сен 2006
Bird flying high, you know how I feel?
DEM Simulation of M&M candies in a rotating drum
SR-DEM simulation of spheroids (candies) in a rotating drum (25 RPM). Each spheroid has ca. 8k surface nodes (vertices) and 16k triangles.
Because in SR-DEM the contact algorithm is based on Master-nodes to slave's SDF (signed distance field), therefore for a pair of contact particles, only the surface nodes of master particle are checked to the slave's SDF. Because of this feature, the contact detection is quite efficient.
Imagine if we use the conventional polyhedron-polyhedron approach, searching for the contact points between 16k-16k triangles (not to mention vertex-vertex, vertex-edge, vertex-triangle; edge-edge, edge-triangle contact pairs), is a very expensive computationally....
Because in SR-DEM the contact algorithm is based on Master-nodes to slave's SDF (signed distance field), therefore for a pair of contact particles, only the surface nodes of master particle are checked to the slave's SDF. Because of this feature, the contact detection is quite efficient.
Imagine if we use the conventional polyhedron-polyhedron approach, searching for the contact points between 16k-16k triangles (not to mention vertex-vertex, vertex-edge, vertex-triangle; edge-edge, edge-triangle contact pairs), is a very expensive computationally....
Просмотров: 227
Видео
Rigid2D: realistic 2D particle shape approximation by multi-spheres
Просмотров 1335 лет назад
This video shows that realistic particle shape can be well represented by minimum 2D spheres (20~30) using proper algorithms.
Rigid2D: Particle avalanche
Просмотров 875 лет назад
The 2D particle shapes are taken from side-views of scanned 3D mesh. Each particle consists of 24-28 overlapping disks that cover 99.99% area of the original 2D shape. Therefore we can see that the particle shape is well approximated using multiple 2D spheres (disks). In the future a 2D polygon version of particle shape will be implemented. It would be interesting to compare these two approache...
Rigid2D: avanlance of ellipse-shaped particles in a confined box
Просмотров 2645 лет назад
This simulation is carried out by "Rigid2D" - a two-dimensional Discrete Element Method (DEM ) software for realistic particle simulation, in which particles are approximated by multiple 2D spheres (disks), either overlapping or non-overlapping. I developed this simulation toolbox mainly for testing different DEM-based contact models (e.g. Hooke, Hertz-Mindlin, etc), the effect of particle shap...
Hopper Fluidized Bed
Просмотров 3 тыс.10 лет назад
A new coupled CFD-DEM solver using PIMPLE loop. CFD: OpenFOAM DEM: LAMMPS (with Liggghts granularpackage)
CFD DEM coupling - pimpleParticleFoam
Просмотров 13 тыс.10 лет назад
A new solver of fluid-particle (CFD-DEM) coupling named pimpleParticleFoam, is based on OpenFOAM (CFD) , LAMMPS (with LIGGGHTS package, DEM) and cfdem schem. The solver incooperates CFD PIMPLE (PISO SIMPLE) scheme which supports adjustable timestep to speed up the simulation. In the video U stands for fluid velocity contour, mass the DEM particles mass. The Coupling results have good agreement ...
Water waves interact with cylinder using OpenFoam
Просмотров 1,8 тыс.10 лет назад
Irregular water waves interaction with semi-immersed cylinder
Simulation of breaking waves on beach
Просмотров 5 тыс.10 лет назад
Realistic CFD simulation of the breaking wave on beach The irreguar waves are acutually combination of two regular waves with different wave crest, wave length and propagation direction. More complex waves can be generated by combined more regular waves at the boundary accourding to your specific cases.
Complex walls in DEM
Просмотров 55810 лет назад
A modified Case of chute wear using DEM code LAMMPS with granular package 'Liggghts'
Realistic Simulation of Rock avalanche - DEM method
Просмотров 90510 лет назад
Each individual rock is composed of 60 spherical particles. Note that by increasing the number of particle for each Rock, the shape of DEM rocks will become more and more realistic compared to the original Rock mesh (from 3D scanner) but will require more computational power. (The color indicates the velocity magnitude)
Hye, is there any possible way that I can personally contacting with you ?
Can you explain the how we can do not the final answera
awesome video! Thank you!
A SR-DEM simulation of tablets packing in a cylinder. The experiment result can be found in: doi.org/10.1016/j.ces.2011.11.011
hey, very good simulation. when i do the similar simulation, it told me the "floating point exception" error, can you tell me how to solve this? thanks so much
You should consult the wave generation module in lastest OpenFoam version. I suppose it is much easier to do this job now😄
hey man, lovely stuff! what software are you using for this i would love to understand the coding behind it all
The waves were simulated with the open source CFD code: OpenFOAM. You can use different wave boundary conditions for different types of water waves. Good luck.
How you did coupling of liggghts and openfoam
Hey Abhishek, I did recently a tutorial using openFoam and Liggghts for the coupling. Glad if you check it out: ruclips.net/video/HsTRkC5EIOw/видео.html
Hey please send me the blockmeshdict file
Well, since this video was made 5 years ago, I could not find the files. But it is simple to make such OpenFoam mesh: first use some 3d modeling tool like blender3D or Gmsh to create STL file. Then you can simply use OF meshing tool snappyHexMesh to create the desired mesh. You can ofc use blockmesh, but it is too trivial.
Hello F.L.Y ! I am also working on CFDEM coupling. I am facing some problems to understand clearly. Could you please provide some information sources where i can understand in better way? Thank you :)
Well, first you need to fully understand some of the examples provided by CFDEM. You might need to read papers on unresolved DEM-CFD coupling.
This is cool man.. Have you any document regarding this?? I am also working in the coupling of OpenFOAM and Liggghts. So can you please help!!!!!!!!!!!!!!
Hello! I also want to know how to install this solver. Could you please provide some information? Thanks ;)
Hey, It is simple: you just need adopt the pimpleFoam , i.e. the PIMPLE algorithm, to the original solver. Good luck
Please, could you share your solver with me? I am working on developing a similar solver but I have had no success. My email address is ooyedeji@utk.edu. Thank you.
@F. L.Y. hey. it is great. Great work indeed. Will you please tell me that is there any solver available in CFDEM Coupling with LIGGGHTS with help of OpenFOAM to simulate a 2D/3D bubble in a liquid dispersed phase? The bubble follows lagrangian particle tracking (LPT) physics and the liquid obeys Eulerian physics. Please feel free to give the details. Its urgent. Waiting for your valuable reply. Thanks in advance
Hi F.L.Y! Could you help me with use this solver? how did you install? I have the CFDEM package installed, and I have only 4 solvers, and I want to use the pimpleParticleFoam...
Hi! I have plans to do something similar for my CFD project, but I want to use wave focusing in stead of irregular waves. Was it possible to read forces on the cylinder from openFoam?
Hey, nice simulation. Which boundary conditions did you use?
Have a look here: www.cfdem.com/ and www.dcs-computing.com/
well, it is pretty much said in the introduction of this video. You can google the relevant keywords. good luck.
That is awesome. Is there anyway to get a starting material to do similar model?