Dear sir: I want to use DEM method in fluent to modeling the fluid-particle flow in a channel. the particle has a diameter of 1e-5. the fluid is water. As attachments show that the velocity of the water doesn't change with the particle added. the pressure drop also remain the same with the case of no particle in water. Could you please give me some suggestions.
Seems to me like the particles in your case are just tracked in the fluid without activating the coupling between the phases. So-called two-way coupling needs to be activated in order to see the momentum transfer from the continuous phase to the disperse phase in the simulation. That is for sure for Lagrange Particle Tracking (LPTM, which is for strange reasons called DPM in Fluent) and should hold for DEM method as well.
Is your flow of 10 micrometer particles sufficiently dense, that it could be expected, that such an interaction between particles would occur? Based on the simulated particle number in your DEM, what is the mean free path between particles? I could imagine, that if your domain is of Meso-/macroscopic size, you would need millions if not billions of particles to fill the space, isn't it? Unfortunately you have not yet provided details about your application, about dimensions of your flow domain and simulated particle numbers in your DEM. So therefore a reasonable judgment is difficult... And what about the density of the particles? Larger or smaller than that of water?
Thank you. My particle is heavier than the base fluid(7800>1000). I conduct the simulation within a 2D plate with 1mm wide and 4cm long. The particle has a volume-fraction of 40%. We need a large number of particles to occupy this volume. But FLUENT treat many particles as a parcel.
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