Journal ArticleDOI
Unsteady Forced Convection Heat Transfer Over a Semicircular Cylinder at Low Reynolds Numbers
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In this paper, an unsteady two-dimensional numerical simulation is performed to investigate the laminar forced convection heat transfer for flow past a semicircular cylinder in an unconfined medium.Abstract:
An unsteady two-dimensional numerical simulation is performed to investigate the laminar forced convection heat transfer for flow past a semicircular cylinder in an unconfined medium. The Reynolds number considered in this study ranges from 50 to 150 with a fixed Prandtl number (Pr = 0.71). Two different configurations of the semicircular cylinder are considered; one when the curved surface facing the flow and the other when the flat surface facing the flow. Fictitious confining boundaries are chosen on the lateral sides of the computational domain that makes the blockage ratio B = 5% in order to make the problem computationally feasible. A finite volume-based technique is used for the numerical computation. The flow and heat transfer characteristics are analyzed with the streamline and isotherm patterns at various Reynolds numbers. The dimensionless frequency of vortex shedding (Strouhal number), drag coefficient, and Nusselt numbers are presented and discussed. Substantial differences in the global flow...read more
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Fluid flow and heat transfer around a confined semi-circular cylinder: Onset of vortex shedding and effects of Reynolds and Prandtl numbers
TL;DR: In this article, a semi-circular cylinder placed in a confined channel is investigated in the unsteady regime, and the two-dimensional simulations are carried out for varying values of control parameters: Reynolds number (Re) = 50-200 and Prandtl number (Pr) = 0.7, 10 and 100 at a fixed blockage ratio of 25% for Newtonian constant-property fluid.
Journal ArticleDOI
Effect of angle of incidence on mixed convective wake dynamics and heat transfer past a square cylinder in cross flow at Re = 100
TL;DR: In this article, a numerical investigation is performed to study the mixed convective flow and heat transfer characteristics past a square cylinder in cross flow at incidence, and the results show that the lateral width of the cylinder wake reduces with increasing alpha and the isotherms spread out far wide.
Journal ArticleDOI
CFD analysis of power-law fluid flow and heat transfer around a confined semi-circular cylinder
TL;DR: In this article, a numerical analysis using Ansys Fluent was carried out to investigate the forced convection of power-law fluids (power-law index varying from 0.2 to 1.8) around a heated semi-circular cylinder with wall confinement (or blockage ratio) of 25, Prandtl number of 50, and Reynolds numbers 1-40.
Journal ArticleDOI
Laminar mixed convection in a channel with a built-in semi-circular cylinder under the effect of cross-buoyancy
Manu K. Sukesan,Amit Dhiman +1 more
TL;DR: In this article, the effects of cross-buoyancy mixed convection on flow and heat transfer characteristics of a long semi-circular cylinder (long in neutral direction) in a confined channel have been investigated in the laminar regime.
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Analysis of heat transfer around bluff bodies with variable inlet turbulent intensity: A numerical simulation
TL;DR: In this paper, a numerical simulation is carried out to analyze the effect of turbulent intensity on the flow behavior of flow past two dimensional bluff bodies, and the results obtained through numerical simulation are validated with other published results by researchers and show good agreements.
References
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Numerical solutions for steady flow past a circular cylinder at Reynolds numbers up to 100
S. C. R. Dennis,Gau-Zu Chang +1 more
TL;DR: In this article, a finite-difference solution of the equations of motion for steady incompressible flow around a circular cylinder has been obtained for a range of Reynolds numbers from R = 5 to R = 100, where the wake length increases linearly with R over the whole range from the value, just below R = 7, at which it first appears.
Journal ArticleDOI
Details of the drag curve near the onset of vortex shedding
TL;DR: In this article, high-resolution computer simulations are presented to quantify the change in viscous drag, pressure drag, and base pressure coefficients of a circular cylinder near the onset of vortex shedding, showing that there is a sharp transition in the forces acting on a body moving through a fluid when it produces an unsteady wake.
Journal ArticleDOI
Steady Two‐Dimensional Viscous Flow of an Incompressible Fluid past a Circular Cylinder
Hideo Takami,Herbert B. Keller +1 more
TL;DR: In this article, the Navier-Stokes equations are replaced by a set of finite difference equations and the numerical solution is obtained by means of an iteration method, where the flow is assumed to be uniform at infinity upstream and the range of Reynolds numbers extends from 1 to 60.
Journal ArticleDOI
Free-surface flow over a semicircular obstruction
TL;DR: In this paper, the steady flow of a fluid over a semicircular obstacle on the bottom of a stream is discussed, along with a numerical method for the solution of the fully nonlinear problem.
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