Thank you DrAmine for the response. I know about the challenges of using DDPM. However, most of the recent studies has used DEM in studying cyclones. As you can see, there are even tutorials provided by ansys in which DDPM-DEM is used.nMy problem is that I can't get any results following the steps mentioned in the tutorial. Moreover, I am not sure why there is no option available for two-way turbulence modelling while using the RSM model.n