NUMERICAL STUDY OF THE FLOW PAST A CYLINDER EXCITED TRANSVERSELY TO THE INCIDENT STREAM. PART 2: TIMING OF VORTEX SHEDDING, APERIODIC PHENOMENA AND WAKE PARAMETERS

2000 ◽  
Vol 14 (6) ◽  
pp. 853-882 ◽  
Author(s):  
P. ANAGNOSTOPOULOS
Keyword(s):  
Vortex Shedding ◽  
Numerical Study ◽  
Flow Past ◽  
Flow Past A Cylinder

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

Vortex shedding and three-dimensional behaviour of flow past a cylinder confined in a channel

2011 ◽  
Vol 27 (5-6) ◽  
pp. 855-860 ◽  
Author(s):  
Martin D. Griffith ◽  
Justin Leontini ◽  
Mark C. Thompson ◽  
Kerry Hourigan
Keyword(s):  
Vortex Shedding ◽  
Three Dimensional ◽  
Flow Past ◽  
Flow Past A Cylinder

scholarly journals Numerical study of time-dependent ferrofluid flow past a cylinder in the presence of stationary magnetic field

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Anupam Bhandari
Keyword(s):  
Magnetic Field ◽  
Drag Coefficient ◽  
Numerical Study ◽  
Lift Coefficient ◽  
Time Dependent ◽  
Stationary Magnetic Field ◽  
Flow Past ◽  
Flow Past A Cylinder ◽  
Dependent Viscosity ◽  
The Magnetic Field

AbstractThis work investigates time-dependent ferrofluid flow past in a cylinder in the presence of a 10 kilo-ampere per meter magnetic field. The Reynolds number is about a hundred to keep the laminar flow and it is high enough to form a von Karman vortex street. This study presents the results for the velocity distributions, pressure distributions, lift coefficient, and drag coefficient under the influence of the stationary magnetic field. These results are compared with the flow in the absence of the magnetic field. The presence of the magnetic field diminishes the velocity distributions in the flow due to magnetization force and magnetic field dependent viscosity. This reduction in the velocity reduces the average velocity in the flow and therefore the magnetic field intensity enhances the coefficients of drag and lift. In the presence of the applied magnetic field, the velocity drops from 2.19 to 1.97 m/s at t = 7 s. However, the lift coefficients enhance from 3 m2s2/kg to 3.4 m2s2/kg and the drag coefficient enhances from 0.9 to 3 m2s2/kg. The numerical simulation of the problem is obtained using the finite element method in COMSOL Multiphysics.

Flow Past a Forced Oscillating Cylinder: A Three-Dimensional Numerical Study

2019 ◽  
Author(s):  
Huan Ping ◽  
Yan Bao ◽  
Dai Zhou ◽  
Zhaolong Han
Keyword(s):  
Stokes Equations ◽  
Numerical Study ◽  
Three Dimensional ◽  
Flow Dynamics ◽  
Navier Stokes ◽  
Two Dimensional ◽  
Navier Stokes Equations ◽  
Flow Past ◽  
Flow Past A Cylinder ◽  
Two Dimensional Flow

Abstract In this paper, we conducted a three-dimensional investigation of flow past a cylinder undergoing forced oscillation. The flow configuration is similar to the work of Blackburn & Henderson (1999) [1], in which Reynolds number equals to 500 and a fixed motion amplitude of A/D = 0.25. The oscillation frequencies are varied in the range near to the natural shedding frequency of a stationary cylinder. The flow dynamics are governed by Navier-Stokes equations and the solutions are obtained by employing high-order spectral/hp element method. It is found that the flow dynamics are significantly distinguished from the study of two-dimensional flow by Blackburn & Henderson (1999) [1]. The values of hydrodynamic forces are smaller compared to that in the two-dimensional study. However, lock-in boundary we identified is broader. In addition, a different type of hysteresis loop of energy transfer coefficient is obtained.

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