External combustion with DPM

Markus

Hello, I am modeling what is essentially a flame thrower with inert polyetylene particles being injected in the centre of the flame. Reasonable models have been made of the continuous phase that agree with experimental measurements. Uncoupled particles have been injected and a converged solution was achieved with stability (no residual spikes, flat).

I am having great difficulty getting reasonable solutions for a coupled simulation (coupling was enabled after convergence was attained for uncoupled flow). I have tried reducing the URF of the DPM, increasing the # of continuous flow iterations/DPM iteration and varying the # of stochastic tries. Even the continuous phase is very different from what it should be after few/many iterations.

Is there anyone that can give some advice? I would appreciate anything you may have to offer.