Turbulent mixing in jets

Department of Energy (ASC)         Graduate Student: Pradeep Babu

 

                   

Direct numerical simulation is used to study the process by which turbulent jets transport contaminants. The importance of accounting for inflow entrainment in simulations has been demonstrated. In addition to profiles of mean and turbulent velocities, and passive scalar, the axial variation of entrainment computed, shows good agreement with experiment. The figures above show contours of scalar concentration from the direct numerical simulations. The simulation results were used to propose a simple kinematic model that predicts experimentally observed variation of passive scalar rms levels with Reynolds number. The model relates scalar rms levels to the oscillation of sharp fronts whose thickness decreases with increasing Reynolds and Schmidt number.

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