[Brandon Han]

Hello everyone, this is Brandon Han. I have a problem about Fluent DPM and I really hope someone can help me.

I'm working on a transient coal combustion simulation using Fluent DPM model. I use injections to describe coal which is added into the furnace at regular intervals. I'm using "surface" to add coal into the furnace in injection. What I'm trying to achieve is to add 15 particles every 15 seconds. The coal-adding surface is divided into 15 small faces. If I set "flow rate" to a number which is lower than one particle mass, then the coal won't be added into the furnace. I have to increase the "flow rate" to a number which is larger than one coal mass. However, the numbers of coal particles added into the furnace is more than expected. I tried to increase "particle time step size". increasing from 1 to 6 worked, but failed from 6 to 10. It's still a little far from satisfaction from what I expect.

What I'm trying to do is add 15 particles in 15 seconds by surface adding in injections. But either setting flow rate or increasing particle time step cannot meet the demand.

I will really appreciate it if someone can give me some advice.

Thanks in advance.

Brandon Han