Hi Sir! Could you please give me a hint about defining COR in CFDEM? Many researchers also didn't provide the detail about this value in their paper. Does it come from experiments or just some empirical values ? Any of your response would be appreciated. Thanks!
Hey Bo, thanks for this great question. The cor or coefficient of restitution is a value which determines the damping in the normal contact of a particle - particle or particle - wall contact. Since there are other values like friction which also lead to a reduction of kinetic energy the influence of the cor is not very big. Parameter studies show that the effect is so minor that this parameter is not calibrated usually. If you use a value between 0.3 and 0.6 it should be ok for standard bulk materials. If you are simulating spheres made out of glas or steel you can set it higher.
@@engineerdo6568 Hi Sir! Thanks for your detailed and professional explanation. According your tutorials, it seems that there is no parallel setting in LIGGGHTS. Does this mean that the parallel setting is only needed in OpenFoam for a CFDEM simulation?
Really great job! Recently, I want to introduce Magnus force and Saffman lift force into my CFDEM case. However, I don't know how to make it. Could you please give me a hint? Many thanks!
Hi, thank you for sharing the very nice job. I am impatiently waiting for the tutorial of the simulation. Appreciate it!
Currently working on it...
Nice Simulation! Have a great weekend!
Thanks Vivi K, you too!
Very good,waiting for tutorial
Thanks. It will be after the next, which will show the installation process for cfd-dem coupling of Liggghts and OpenFoam
Hi Sir! Could you please give me a hint about defining COR in CFDEM? Many researchers also didn't provide the detail about this value in their paper. Does it come from experiments or just some empirical values ? Any of your response would be appreciated.
Thanks!
Hey Bo, thanks for this great question. The cor or coefficient of restitution is a value which determines the damping in the normal contact of a particle - particle or particle - wall contact. Since there are other values like friction which also lead to a reduction of kinetic energy the influence of the cor is not very big. Parameter studies show that the effect is so minor that this parameter is not calibrated usually. If you use a value between 0.3 and 0.6 it should be ok for standard bulk materials. If you are simulating spheres made out of glas or steel you can set it higher.
@@engineerdo6568 Hi Sir! Thanks for your detailed and professional explanation. According your tutorials, it seems that there is no parallel setting in LIGGGHTS. Does this mean that the parallel setting is only needed in OpenFoam for a CFDEM simulation?
Really great job!
Recently, I want to introduce Magnus force and Saffman lift force into my CFDEM case. However, I don't know how to make it. Could you please give me a hint?
Many thanks!
Go for it! I would start to look into the coupling files.
Danke sehr. 🔝🔝🔝