Turbulence Modeling Validation for Afterbody Flows
Abstract
In this paper, we propose the introduction of several scales characterizing different process of turbulence interaction by using multi-scale model. The multi-scale turbulence modeling consists in partitioning the energy spectrum into several regions, each characterized by a different time scale. Thus different mechanisms such as the return to isotropy, dissipation, diffusion, and viscosity can be modeled using the various characteristic scales. In the simplified split-spectrum used by Kim, turbulent transport is described by using two time scales: the first one corresponds to the large eddies and describes generation of turbulent kinetic energy, and the second one corresponds to the smaller-scale eddies and describes dissipation rate. The turbulent energy can be partitioned into three regions: production region, characterized by the turbulent kinetic energy k(sub p) and the energy transfer rate epsilon(sub p), transfer region, characterized by the turbulent kinetic energy k(sub t) and the dissipation rate epsilon(sub t) and dissipation region, where the turbulent kinetic energy is dissipated into heat.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 2002
- Accession Number
- ADA409279
Entities
People
- A. Hadjadj
- A. N. Kudryavtsev
Organizations
- Russian Academy of Sciences