A New Dynamic SGS Model for Large Eddy Simulation of Particle-Laden Turbulent Flows
INSTITUTE OF PHYSICAL AND CHEMICAL RESEARCH SAITAMA (JAPAN) COMPUTER AND INFO DIV/ADVANCED COMPUTING CENTER
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The paper presents a new dynamic SGS model of two-way coupling for large eddy simulation of particle-laden turbulent flow. The advantage of this new model is that coupling of fluid-particles SGS components was taken into account and at the same time the coefficient of proposed SOS model can be optimized by Germanos 1991 dynamic procedure. To investigate the capability of this model, numerical simulations of particle-laden turbulent flow at Re644 in a vertical channel were performed using this new dynamic SGS model. By comparing the calculation results with that using single-phase SGS models which didnt consider coupling of SGS components the role of particles SGS components played in the turbulence modulation of fluid flow was clarified for particle-laden channel turbulent flows. In addition, the subgrid-scale stresses obtained using the proposed model vanish at wall boundary, and have the correct asymptotic behavior in the near-wall region of the turbulent boundary.
- Fluid Mechanics