Hello,
I want to simulate flow impingement of a particle bed. The problem is that the mesh requirement in the center area of the nozzle conflicts with the requirement that the mesh size need to be larger than the particle size.
For example, a nozzle diameter of 6mm requires a mesh size of 1mm. A particle size of 2mm requires a mesh size of 5mm.
Using a mesh of 1mm results in floating point exception errors, which are caused by an error in the volume fraction calculation. The image below shows the problem. The left part is the nozzle and the right area is filled with particles. You can see that the volume fraction deviates in the middle of the right area, where the mesh size is 1mm.
And using a mesh of 6mm results in flow convergence errors.
My opinion on this problem is that I need to improve the ddpm method. For example, divide the large particles into 27 pieces when calculating the volume fraction. I would like to know how to modify the EDEM-Fluent coupling code. And is there any other way to solve this problem?
fang yanwei
24.11.16
