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DPM cloud size and domain size dependency

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Old   April 19, 2015, 16:50
Default DPM cloud size and domain size dependency
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Hi,

I'm new to DPM modelling.

My project contains the domain 2.5x3x6 [m] with an inlet in the center of 2.5x3 [m] surface. Inlet d=0.003 [m]. I need to simulate the injection of water particles into the domain of air to determine the distribution. I am injecting the particles from inlet surface (d=0.003m) and the same surface is also velocity inlet v=200m/s. Rest of the boundaries of the domain are pressure outlets with 0 gauge pressure. I am using the breakup model. Turbulence model - k-epsilon standard wall function. Drag model for the particles is dynamic-drag. Uniform temp. 300K.

My DPM settings are:
1. inject DPM every 5 iterations of continuous phase
2. particle time step size 0.0005s and number of time steps 1
3. tracking: number of steps 600 and length scale 0.01m

My results after 1000 iterations look like this (attachment 1.jpg)

The cloud is not covering the whole domain.

Is the iterations number 1000 enough ?
Is this the physical behavior of the presented phenomena that the cloud is not reaching the whole domain?
Which settings can I manipulate to tweak with the distribution in order to cover the whole domain ?

Thanks for your time and help,
Mateusz
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