DDPM divergence problem

carlaoc19 · December 30, 2017, 01:50

Hello, I have a problem using the DDPM model coupled with eulerian model.

I'm working in the simulation of a hydrocyclone, where I have 3 phases, phase1: water (eulerian model), phase2: air (eulerian model), phase3: antracite (DDPM). I'm working with Dense Discrete Phase Model (DDPM) for the antracite.

Time Step: 1e-4
Iteraciones/Time Step: 35

Inicialization: I patch the interior of hydrocyclone with air, then I start the inlet of water, past 1 second I start the inlet of antracite.

The antracite inlet is with a Rosin-Rammler distribution where
Vel inlet: 6,45 m/s
mass flow rate: 1 kg/s
Max diameter: 0,00021 m
Min diameter: 0,00001 m
Mean diameter: 0,000035 m
spread number: 1,057
Number of diameters: 7

The mesh have 250.000 elements. The max skew quality is 0,5.

I thing maybe the Parcel Diameter is too high i/r with the cell size. I adjunt my case. I need help because this proyect is my tesis

, and i have this problem for 4 months.

The case is in this link : https://mega.nz/#!eYB30bAZ!RiypP8Vn_...CTmPyK2AqmFRQ8

For any reason, I can't attach the file at the post.

Thank You

sfn · January 10, 2018, 10:09

don't track particles with fluid flow timestep and reduce particle timestep size
also you may try to refine your mesh

BlnPhoenix · January 12, 2018, 02:35

What's your average cell size? What's the smallest cell size?

December 30, 2017, 01:50	DDPM divergence problem	#1
carlaoc19 New Member Join Date: Nov 2017 Posts: 2 Rep Power: 0	Hello, I have a problem using the DDPM model coupled with eulerian model. I'm working in the simulation of a hydrocyclone, where I have 3 phases, phase1: water (eulerian model), phase2: air (eulerian model), phase3: antracite (DDPM). I'm working with Dense Discrete Phase Model (DDPM) for the antracite. Time Step: 1e-4 Iteraciones/Time Step: 35 Inicialization: I patch the interior of hydrocyclone with air, then I start the inlet of water, past 1 second I start the inlet of antracite. The antracite inlet is with a Rosin-Rammler distribution where Vel inlet: 6,45 m/s mass flow rate: 1 kg/s Max diameter: 0,00021 m Min diameter: 0,00001 m Mean diameter: 0,000035 m spread number: 1,057 Number of diameters: 7 The mesh have 250.000 elements. The max skew quality is 0,5. I thing maybe the Parcel Diameter is too high i/r with the cell size. I adjunt my case. I need help because this proyect is my tesis , and i have this problem for 4 months. The case is in this link : https://mega.nz/#!eYB30bAZ!RiypP8Vn_...CTmPyK2AqmFRQ8 For any reason, I can't attach the file at the post. Thank You

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January 10, 2018, 10:09		#2
sfn New Member Alexander Join Date: Dec 2016 Posts: 24 Rep Power: 9	don't track particles with fluid flow timestep and reduce particle timestep size also you may try to refine your mesh

January 12, 2018, 02:35		#3
BlnPhoenix Senior Member Join Date: Aug 2014 Location: Germany Posts: 292 Rep Power: 13	What's your average cell size? What's the smallest cell size?