Thank you for you responses. I am working on flow problem which include one rotary tube.When this tube start rotating from one end the granular powder get flow which is in the micron size While on other end gas will come.I am interested in the simulation of its flow, temperature and velocity profile of particle after different interval of time and interested to find solid gas interaction.The solver I choose for this process is Ansys 16,Fluent@Dušan Regodić , Filippo Maria Denaro , Vikas Kannojiya