A study of sudden expansion pipe flow using an algebraic stress model of turbulence
Abstract
The predictive ability of an algebraic stress model (ASM) and the Boussinesq viscosity model (BVM), or the k-epsilon model, is tested on a sudden expansion pipe flow against recently published measurements using a laser Doppler velocimeter. Calculations are compared with the measurements on the mean axial velocity and axial turbulence intensity. While the standard model constants are used for the BVM, the additional constants that multiply the 'return-to-isotropy' and 'rapid' parts of the pressure-strain term in the ASM are tuned to the classical pipe flow data of Laufer (1956). Both in the recirculation and redevelopment regions, the ASM results are in excellent agreement with the data, representing an improvement over the present BVM simulation and an earlier 2/E/FIX prediction of this flow. The ability of the ASM to successfully simulate the effects of streamline curvature and anisotropy in the turbulence field appears to be the major factor contributing to this success.
- Publication:
-
4th Fluid Mechanics, Plasma Dynamics and Lasers Conference
- Pub Date:
- May 1986
- Bibcode:
- 1986fmpd.confR....S
- Keywords:
-
- Computational Fluid Dynamics;
- Expansion;
- Flow Geometry;
- Pipe Flow;
- Turbulence Models;
- Turbulent Flow;
- Boundary Value Problems;
- Computational Grids;
- Flow Measurement;
- Incompressible Flow;
- K-Epsilon Turbulence Model;
- Fluid Mechanics and Heat Transfer