Effect of tube spacing on the vortex shedding characteristics of laminar flow past an inline tube array: A numerical study

2009 ◽  
Vol 38 (4) ◽  
pp. 950-964 ◽  
Author(s):  
Chunlei Liang ◽  
George Papadakis ◽  
Xiaoyu Luo
Keyword(s):  
Laminar Flow ◽  
Vortex Shedding ◽  
Numerical Study ◽  
Flow Past

A Combined Experimental and Numerical Study of Flow Past a Single Step Cylinder

2010 ◽  
Author(s):  
Chris R. Morton ◽  
Serhiy Yarusevych
Keyword(s):  
Vortex Shedding ◽  
Numerical Study ◽  
Experimental Tests ◽  
Numerical Approach ◽  
Single Step ◽  
Wake Flow ◽  
Cylinder Wake ◽  
Flow Topology ◽  
Single Vortex ◽  
Flow Past

The current study investigates flow past a step cylinder for ReD = 1050 and D/d = 2 using both experimental and numerical methods. The focus of the study is on the vortex shedding and vortex interactions occurring in the step cylinder wake. Flow visualization with hydrogen bubble technique and planar Laser Induced Fluorescence has shown that three distinct spanwise vortex cells form: a single vortex shedding cell in the wake of the small cylinder and two vortex shedding cells in the wake of the large cylinder. Vortex connections form between the spanwise vortices in these cells downstream of the step, and vortex dislocations occur at cell boundaries. Complementary to the experimental tests, an LES-RANS hybrid numerical simulation is used to model the flow development. A comparison of the experimental and numerical results indicates that the numerical approach adequately models vortex dynamics in the wake of a step cylinder and, thus, may be used to analyze time dependent, three-dimensional flow topology which is difficult to characterize quantitatively using experimental methods.

Numerical study of vortex shedding in viscoelastic flow past an unconfined square cylinder

2015 ◽  
Vol 27 (3) ◽  
pp. 213-225 ◽  
Author(s):  
Mahmood Norouzi ◽  
Seyed Rasoul Varedi ◽  
Mahdi Zamani
Keyword(s):  
Vortex Shedding ◽  
Numerical Study ◽  
Viscoelastic Flow ◽  
Square Cylinder ◽  
Flow Past

Steady and Unsteady Laminar Flow Past an Equilateral Triangular Cylinder for Two Different Orientations

2007 ◽  
Author(s):  
Zakir Faruquee ◽  
Temitope V. Olatunji
Keyword(s):  
Fluid Flow ◽  
Laminar Flow ◽  
Drag Coefficient ◽  
Incompressible Flow ◽  
Vortex Shedding ◽  
Equilateral Triangle ◽  
Downstream Side ◽  
Flow Past

Unconfined fluid flow past an equilateral triangle was numerically studied for laminar incompressible flow. Two configurations of the cylinder were studied. In the first configuration; a vertex was placed upstream and a side was placed in the downstream position normal to the flow, while in the second configuration; the orientation of the triangle was reversed, i.e. the side normal to the flow was placed upstream and a vertex was placed at the downstream. Both steady and unsteady simulations were performed at 30 ≤ Re ≤ 150. The results clearly show that the orientation of the triangle with the vertex at the downstream side stabilized the flow and delayed the onset of vortex shedding. Significant differences of drag coefficient, wake length, and velocity distributions were found between the two orientations of the equilateral triangle.

Incompressible Laminar Flow Past a Transversely Vibrating Cylinder

1987 ◽  
Vol 109 (2) ◽  
pp. 166-171 ◽  
Author(s):  
R. Chilukuri
Keyword(s):  
Experimental Data ◽  
Laminar Flow ◽  
Finite Difference ◽  
Vortex Shedding ◽  
Lift Coefficient ◽  
Small Vibration ◽  
Flow Past ◽  
Implicit Finite Difference Scheme ◽  
Implicit Finite Difference ◽  
Experimental Scatter

An implicit finite difference scheme in primitive variables is used for analysis of unsteady, laminar flow past transversely vibrating cylinders. Predictions of flow past an impulsively started cylinder and of vortex shedding from a stationary cylinder agree well with experimental data. Calculations of flow past a transversely vibrating cylinder were within the range of experimental scatter only for small vibration amplitudes. Several experimentally observed phenomena such as drag amplification and reduction in excitation lift coefficient at large vibration amplitudes were numerically predicted.

Numerical study of laminar flow past one and two circular cylinders

1991 ◽  
Vol 19 (2) ◽  
pp. 155-170 ◽  
Author(s):  
J. Li ◽  
A. Chambarel ◽  
M. Donneaud ◽  
R. Martin
Keyword(s):  
Laminar Flow ◽  
Numerical Study ◽  
Circular Cylinders ◽  
Flow Past
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