A project by DCS Computing and CFDEMresearch
Dear all
Openfoam 2.3.0 has been issued, and it has DPM method.
Does anyone has the experience of the comparision of DPM and DEM? It looks DPM also considers the collision between particles but in a "global" way, which allows the huge number of particles.
Does anyone has comments ont that?
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cfdsam | Wed, 06/25/2014 - 17:03
Hi,
Hi,
I have same question. What is the preference of CFDEM in contrast to openfoam?
Regards,
cgoniva | Thu, 06/26/2014 - 11:47
Hi all,
Hi all,
Good to see that new models are available!
Please free to compare the codes and I am pretty sure CFDEM(R)coupling will be faster for bigger cases.
I tried the std. tutorial coming with 2.3.x which performs not very fast.
Kind regards
Chris
Bruno | Mon, 07/07/2014 - 21:38
Hey,
DPM handles particle-particle collision in a very distinctive manner. It uses the projection of the volume fraction unto the Eulerian mesh to calculate a "granular pressure" that is used as an isotropic stress tensor. The gradient of this granular pressure is then used as a source term in the motion of the particle. It usually leads to a stiff pressure and etc., so it's not as trivial as it sounds.
There is a very good article (Snider-2001) on that method in 3d : http://www.sciencedirect.com/science/article/pii/S0021999101967476
Cheers,
Bruno
maysmech | Thu, 07/24/2014 - 20:13
Hi,
Hi,
If I understand correctly, you mean DPM in OpenFOAM doesn't use hard sphere or soft sphere models and defines granular pressure and temperature like TFM. Isn't it?
As I know DPM or DEM should solve Newton's law for discrete phase (as CFDEM uses) but why didn't it any Newton's law in this paper?
Are DPMFoam an MPPICFoam use same routine? The paper talks about MP-PIC in whole of its text.
Thanks