Hello, friends, Now I have a 3-D box with air flowing. I want to inject a certain mass flow rate of water bubbles which have lower temperature of the air from a hole on the top of the box and see their energy exchange. Is it reasonable for me to use the Discrete Phase Model? If it is, what kind of inject is proper for this case? Single or surface and what is the boundary condition? Reflect or trap? Thanks very much.

what do you mean by 'water bubbles', is it droplet? if so DPM can be applied. just refer fluent documentation on DPM for it. it fairly easy to use. cheer, jolius

Thanks. Yes, it is droplet. I try to use the surfact injection of water, but when I finish my calculation and track the particles, there is 44 particles and 9 are incompleted. What does it mean? How can I improve to deal with the incompleted particles? Thanks again.

maybe you have to increase the number of iteration in DPM panel..I remember that I did change the iteration no to 20000 when I track the 'inert particle' in cyclone 3 year ago... it might worth to try it... some of my particle didn't complete as well, meaning that the particle are still in the domain and neither 'trapped' or 'exit' anyway.. hope it help