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ARTICLE
NUMERICAL SIMULATION OF TURBULENT FLOW IN A RECTANGULAR CHANNEL WITH PERIODICALLY MOUNTED LONGITUDINAL VORTEX GENERATORS
Pankaj Sahaa, Gautam Biswasa,b,*
a Department of Mechanical Engineering, Indian Institute of Technology, Kanpur, U.P, 208016, India
b
Central Mechanical Engineering Research Institute (CSIR) Durgapur, Durgapur, W.B, 713209, India
* Corresponding Author: Email:
Frontiers in Heat and Mass Transfer 2011, 2(3), 1-5. https://doi.org/10.5098/hmt.v2.3.3008
Abstract
Detailed flow structure in turbulent flows through a rectangular channel containing built-in winglet type vortex generators have been analyzed by
means of solutions of the full Navier-Stokes equations using a Large-Eddy Simulation (LES) technique. The Reynolds number of investigation is
6000. The geometry of interest consists of a rectangular channel with a built-in winglet pair on the bottom wall with common-flow-down
arrangement. The winglet pair induces streamwise longitudinal vortices behind it. The vortices swirl the flow around the axis parallel to the
mainstream direction and disrupt the growth of thermal boundary layer entailing enhancement of heat transfer. The influence of the longitudinal
vortices persist far downstream of the location of the winglet-pair. Since the structure of the turbulence is strongly affected by the streamline
curvature, the flow of interest, despite the simplicity of its geometry, turns out to be extremely complex. Therefore it calls for more accurate
calculation of the turbulent quantities. In the present study, flow structures are studied by using time-averaged quantities, such as the iso-contours of
velocity components, vortices and turbulent stresses. The simulation shows that the secondary flow is stronger in the regions where the longitudinal
vortices are more active. The wake like structures of streamwise velocity occurs due to strong distortion of the boundary layer by vortices. The
spanwise distributions of turbulent kinetic energy and Reynolds stress show the evidence of strong secondary flow. The computational results
compare well with the experimental data qualitatively.
Keywords
Cite This Article
Saha, P., Biswas, G. (2011). NUMERICAL SIMULATION OF TURBULENT FLOW IN A RECTANGULAR CHANNEL WITH PERIODICALLY MOUNTED LONGITUDINAL VORTEX GENERATORS.
Frontiers in Heat and Mass Transfer, 2(3), 1–5.