Affiliation:
1. Mississippi State University
Abstract
This paper presents the initial development and validation of a modified two-equation eddy-viscosity turbulence model for computational fluid dynamics (CFD) prediction of transitional and turbulent flow. The new model is based on a k-ω model framework, making it more easily implemented into existing general-purpose CFD solvers than other recently proposed model forms. The model incorporates inviscid and viscous damping functions for the eddy viscosity, as well as a production damping term, in order to reproduce the appropriate effects of laminar, transitional, and turbulent boundary layer flow. It has been implemented into a commercially available flow solver (FLUENT) and evaluated for simple attached and separated flow conditions, including 2-D flow over a flat plate and a circular cylinder. The results presented show that the new model is able to yield reasonable predictions of transitional flow behavior using a very simple modeling framework, including an appropriate response to freestream turbulence and boundary layer separation.
Reference45 articles.
1. Kalitzin
G.
, WuX. and DurbinP. A., 2003, “DNS of Fully Turbulent Flow in a LPT Passage,” International Journal of Heat and Fluid Flow, 24(4), 636–644.
2. Savill, A.M., 1993, “Some Recent Progress in the Turbulence Modeling of By-Pass Transition,” Near-Wall Turbulent Flows, edited by R.M.C. So, C.G. Speziale, and B.E. Launder, Elsevier, Amsterdam, 829–848.
3. Savill, A.M., 2002, “By-Pass Transition Using Conventional Closures,” Closure Strategies for Turbulent and Transitional Flows, Cambridge University Press, Cambridge, 464–492.
4. Wilcox
D. C.
, 1994, “Simulation of Transition with a Two Equation Turbulence Model,” AIAA Journal, 32, 247–255.
5. van Driest
E. R.
and BlumerC. B., 1963, “Boundary Layer Transition, Free Stream Turbulence, and Pressure Gradient Effects,” AIAA Journal, 1, pp. 1303–1306.