A Turbulence Model for Recirculating Flow
File : pdf, 1 MB, 30 pages
Abstract
A simple adjustment is proposed that improves the predictions of the standard k-E turbulence model in the presence of two-dimensional recirculating flow. An eddy Reynolds number calculated from velocity, vorticity, and eddy viscosity is introduced as a scaling parameter for reducing the decay term in the governing equation for the turbulence-energy dissipation rate. Using the adjusted k-6 model to compute the flow past a backstep (channel expansion), the STEMR finite-difference code gives better predictions for streamlines, velocities, and turbulence energies than it does with the standard k-E model. Computed reattachment lengths compare well with experimental data for channel expansion ratios between 1 and 2.
PART I: INTRODUCTION
Background
Purpose and Scope
PART 11: GOVERNING EQUATIONS
PART 111: BOUNDARY CONDITIONS
PART IV: MODIFICATIONS TO THE STANDARD MODEL
PART V: NUMERICAL ALGORITHMS
PART VI: TEST PROBLEM
PART VII: COMPUTED RESULTS
PART VIII: CONCLUSION
REFERENCES
Download : pdf
