Abstract
A jet of fluid discharging into a cross stream, also known as Jet In Crossflow (JICF), has received many experimental and numerical investigations. In addition to the fundamental understanding of three-dimensional mixing and shear flow characteristics, the fluid dynamics research community often regarded it as a benchmark test case for validating turbulence models. Although many authors considered the canonical case of a jet issuing from a circular orifice, the rectangular shape has received less numerical investigations. The present study deals with a jet issuing from a rectangular duct into a confined crossflow domain in which five jet-to-crossflow velocity ratios ranging from 3.3 to 10 are considered. The analysis focuses on the reliability of three two-equation turbulence models, namely k-ϵ, k-ω and SST in predicting this type of complex flow phenomena. Comparisons with previous large-eddy simulation results and available test data for the same problem have revealed good agreement in predicting 'mean' flow properties, but relative poor agreement in predicting the second-order statistics. It indicates that this type of flow exhibits significant non-equilibrium behavior for which the commonly used two-equation turbulence models are unable to deal with. Thus it is necessary to apply anisotropic turbulence model such as Reynolds stress model or high-fidelity large-eddy simulation method.
Highlights
Case for fundamental understanding of three-dimensional turbulent mixing and shear layer flows, it is often used
The flow parameters have been chosen based on a previous incompressible Large-Eddy Simulation (LES)
This method was found to work well compared with instantaneous turbulent inlet velocity profiles at the jet plane from a fully-developed duct flow
Summary
Case for fundamental understanding of three-dimensional turbulent mixing and shear layer flows, it is often used. A non-reacting transverse jet is a configuration applicable for chimney stacks, Vertical and/or Short Take-Off and Landing (V/STOL) aircrafts, dilution of combustion gases for validating turbulent models by the fluid dynamics research community (Chochua et al, 2000; Acharya et al, 2001; Chassaing et al, 1974; Schluter and Schonfeld, 2000; Muppidi and Mahesh, 2007). A because of its application in aerospace engineering such as reacting transverse jet could affect the flame stabilization of a fuel jet issuing into a crossflow as a model of stack flares vertical and/or short take-off and landing aircrafts, steering of rockets, film cooling of turbine blades, fuel injection and the secondary combustion zones in a gas turbine into combustors, etc.
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