Modulation and Subgrid Scale Modeling of Gas-Particle Turbulent Flow
Turbulence modulation in particle-laden fluid flow, especially the influence of vortex shedding, was investigated based on the direct numerical simulation. To this end, we developed a finite-difference scheme to resolve the flow around each particle moving in turbulence. Energy budget around a sphere suggested that the energy production due to vortex shedding was about 20% of work by the particle. Homogeneous turbulence including many particles showed a modulation in background turbulence; namely, energy transfer from larger to smaller scale through wavenumber region corresponding to the mean spacing of particles. Taking these findings into account, a one-equation model for subgrid scale turbulence was suggested for the large-eddy simulation of particle-laden turbulence.
KeywordsDirect Numerical Simulation Subgrid Scale Fluid Turbulence Homogeneous Turbulence Particle Reynolds Number
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- Kajishima, T., Takiguchi, S. and Miyake, Y. (1998) Direct Numerical Simulation of Interaction between Turbulence and Particles, Proc. ASME Fluids Engineering Division Summer Meeting, Washington, DC, No.FEDSM98-5021 (CD-ROM)Google Scholar
- Takiguchi, S., Kajishima, T. and Miyake, Y. (1999) Numerical Scheme to Resolve the Interaction between Solid Particles and Fluid Turbulence, to appear in JSME Int. J., Ser.B, 42 Google Scholar
- White, F.M. (1991) Viscous Fluid Flow, McGraw-Hill, New York.Google Scholar