Learning Forum

[satyam01]

How to control the number of particles in the flow domain when using DPM?

 

[Rob]

In the domain or entering the domain? Please elaborate on your question. 

[satyam01]

I am talking about the particles entering.

I have noticed that the particles enter the domain as parcels and I went to the theory guide to see that there is a formula for calculating the number of particles based on mass flow rate. But I could not calculate the same from my model.

[Rob]

What are you trying to model/find out? 

[satyam01]

My work deals with modeling particle flow in a clean room like a data center. I have created a simplified model of particle-laden flow through a floor tile and it looks like the attached image. One of the sides has a low-pressure boundary condition to represent intake fans of the servers and the other three have symmetry boundary conditions. My objective is to steadily create detailed models of such flow to find localized regions of particle concentration in the flow domain.

[Rob]

OK. If you use several injections each of a different uniform size or density you can track what enters & what leaves the domain very easily.  Don't try and fix the number of particles, work with percentages.  You may want to read up on stochastic tracking too. 

[satyam01]

I tried using line and rake to randomize the injection zones and also I could not figure out using multiple injection zones. Initially, I tried using 3-D cone by varying the angle and stagger radius but I want to achieve random injections on my inlet which I haven't been able to do so far. Thank you for your responses!