This study is concerned with the motion of spherical solid particles in fluid flow. The Eulerian frame_work is used to analyze governing equation of gas phase, whereas the particle phase is treated within the Lagrangian point of view. The steady state Reynolds average Navir-Stokes equation are considered for the gas phase. The effect of turbulence on the flow field is modeled via three different turbulence models (Standard k-?, Modified k-? and Algebraic Reynolds stress) and the effect of each model is evaluated. The inter-phase effect are accounted by adding appropriate source term in all conservation equation of the gas phase and additionally considering wake-turbulence two cases have been studied, where first five ones considered for the validation of traort, deposition and dispersion of particles in fluid flow in backward step.The computational simulation results are in good agreement with the existing experimental data and earlier simulation results. The results indicate that both the standard k-? and the modified k-? models fail to accurately predict the fluctuating flow field. It is concluded that a non-isotropic turbulence model should be used to predict the fluctuating turbulence field. In the second case, particles are injected in 2D duct with on obstructed block. The effect of Brownian force increased whereas particle diameter is reduced and more particles entered in the Recirculation zone of back of block.
