[HuifengGong]

Hi all,

I'm doing a simulation for a droplet laden jet flow using LES&DPM, and I'm quite confused about the Mean DPM Diameter distribution along axial direction, as shown in the attached image. There is a distinct drop of diameter not far from the nozzle exit (nozzle exit is located at z=0.05), which I think is unusual and not correct. Does anybody know what happened to my simulation?

My case is about a droplet laden jet from a nozzle tube (10mm in diameter), in which the droplets are carried through a nozzle with air, generating a turbulent jet flow when emanating from the nozzle tube. The continous phase was first simulated using LES, where a velocity UDF was specified at the nozzle exit according to the experimental data. After the continous phase was statistically convergent, the dispersed phase was added at the nozzle exit using DPM model, where an injection file was used to specify the droplet size & velocity distribution at the nozzle exit according to the experimental data. 361 positions of the nozzle exit were determined in the injection file (5circles with 72 positions in each circle, and 1 position at the center), and each position was specified a identical velocity and an droplet size distribution (12 different droplet size bins).

Thanks a lot!

Huifeng