Present work investigates three-dimensional fluid flow and heat transfer for flow past a square cylinder built-in a rectangular channel. The governing equations for viscous fluid flow and heat transfer are solved numerically with the help of an indigenously developed computational code based on modified MAC algorithm. Unsteady computations are performed for Reynolds number in the range of 400-1000 and channel height ranging from 0.5d to 3d (d being side of the square cylinder). The effect of channel height on onset of vortex shedding, other flow characteristics and heat transfer from heated solid surfaces has been presented. Copyright © 2010 Inderscience Enterprises Ltd.

Shaligram Tiwari

Department of Mechanical Engineering

Pratish P. Patil

Fluid flow

FLUID FLOW AND HEAT TRANSFER

MAC ALGORITHM

MAC ALGORITHMS

Square cylinders

Algorithms

Cylinders (shapes)

FLUIDS

Heat exchangers

Nusselt number

Reynolds number

Strouhal number

three dimensional

Vortex shedding

Flow of fluids

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IIT Madras

Three-dimensional numerical investigations on flow and heat transfer for flow past a channel confined square cylinder

Progress in Computational Fluid Dynamics

The characteristics of unsteady wakes behind a stationary square cylinder and another upstream vibrating square cylinder have been investigated numerically with the help of a developed computational code. The effect of longitudinal as well as transverse vibrations of the upstream cylinder is studied on the coupled wake between the two cylinders, which is found to control the vortex shedding behavior behind the downstream stationary cylinder. Computations are carried out for a fixed value of Reynolds number (Re = 200) and three different values of excitation frequencies of the upstream cylinder, namely less than, equal to and greater than the natural frequency of vortex shedding corresponding to flow past a stationary square cylinder. The vortex shedding characteristics of the unsteady wakes behind the vibrating and stationary cylinders are found to differ significantly for longitudinal and transverse modes of vibration of the upstream cylinder. The wake of the downstream stationary cylinder is found to depict a synchronization behavior with the upstream cylinder vibration. The spacing between the two cylinders has been identified to be the key parameter influencing the synchronization phenomenon. The effect of cylinder spacing on the wake synchronization and the hydrodynamic forces has been examined. In addition, a comparison of the drag forces for flow past transversely vibrating square and circular cylinders for similar amplitudes and frequencies of cylinder vibration has been presented while employing the tested computational code. © 2009 The Japan Society of Fluid Mechanics and IOP Publishing Ltd.

Fluid Dynamics Research

Effect of longitudinal and transverse vibrations of an upstream square cylinder on vortex shedding behind two inline square cylinders

A three-dimensional numerical study has been carried out for laminar flow of air past an inline arrangement of circular tubes built-in with a rectangular channel in the presence of vortex generators. The governing equations of momentum and energy are solved with the help of a developed computational code based on finite-volume technique. Computed flow and temperature field results are analyzed with an aim to find an optimum location of vortex generators resulting in the maximum enhancement of heat transfer causing a minimum increase in pressure drop. To find the optimized location of vortex generators, the effect of variation of the Reynolds number on flow and heat transfer has also been studied.

Numerical Heat Transfer; Part A: Applications

Numerical study of flow and heat transfer for flow past inline circular tubes built in a rectangular channel in the presence of vortex generators

Two-dimensional numerical investigations are carried out to study the behavior of wake transition for flow past square cylinder confined between two parallel walls. It is known from past literature that nature of wall confinement affects the behavior of vortex shedding behind the obstacle. The present work reports dependence of the critical Reynolds number (Recr) for onset of planar vortex shedding on blockage ratio. The effect of wall confinement on characteristic features of the wake, such as wake bubble size and shear layer behavior has been studied. The characteristic relationship between Strouhal number and flow Reynolds number has been presented for different values of blockage ratios. The temporal characteristics of the wake are presented. © 2008 The Japan Society of Fluid Mechanics and Elsevier B.V.

Effect of blockage ratio on wake transition for flow past square cylinder

Engineering Applications of Computational Fluid Mechanics

Numerical Investigation of Laminar Unsteady Wakes Behind Two Inline Square Cylinders Confined in a Channel

International Journal of Heat and Mass Transfer

Numerical prediction of flow and heat transfer in a channel in the presence of a built-in circular tube with and without an integral wake splitter

Journal	Progress in Computational Fluid Dynamics
ISSN	14684349
Open Access	No