Abstract
The purpose of this paper is to propose a turbulence model for the three-dimensional vortex blob method. This model uses a modified version of the core-spreading method introduced by Leonard and Chua (1989) in the spirit of the Smagorinsky type of eddy viscosity. The diffusion of vorticity by the molecular viscosity is represented by the core spreading whose rate is approximated by that of a rectilinear viscous vortex tube. The linear combination of the two viscosities yields a Lagrangian turbulence model, which includes the effects of Reynolds number. We apply each model to an impulsively started round jet forced by two helical disturbances rotating in counter directions and compare the vortical structures of the jet among the models to show that the combined model can be a reasonable turbulence model.
| Original language | English |
|---|---|
| Pages (from-to) | 434-442 |
| Number of pages | 9 |
| Journal | JSME International Journal, Series B: Fluids and Thermal Engineering |
| Volume | 43 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2000 |
Keywords
- Coherent structure
- Core spreading
- Jet
- Numerical analysis
- Three-dimensional flow
- Turbulence model
- Viscous diffusion
- Vortex blob method
ASJC Scopus subject areas
- Mechanical Engineering
- Physical and Theoretical Chemistry
- Fluid Flow and Transfer Processes