Journal ArticleDOI
Effects of size ratio and inter-cylinder spacing on wake transition in flow past finite inline circular cylinders mounted on plane surface
Prashant Kumar,Shaligram Tiwari +1 more
TLDR
In this article, three-dimensional numerical computations have been carried out in flow past two inline finite-height circular cylinders using Open Source Field Operation and Manipulation Investigations (OSOOMI).Abstract:
Three-dimensional numerical computations have been carried out in flow past two inline finite-height circular cylinders using Open Source Field Operation and Manipulation Investigations have been carried out for the varying Reynolds number (Re) ranging from 150 to 300 The diameter of the upstream cylinder is varied in such a way that the size ratio (SR, ratio of the diameter of the upstream cylinder to that of the downstream cylinder) takes values of 025, 05, and 10 For each size of the upstream cylinder, the downstream cylinder is placed at different locations in the streamwise direction Effects of Re, SR, and inter-cylinder spacing (S) on three-dimensional unsteady wake characteristics behind upstream and downstream cylinders have been examined using iso-Q surfaces Unsteady wake oscillations in both the wakes are analyzed qualitatively and quantitatively in terms of Hilbert spectra and the degree of stationarity using the transverse velocity component in the wake Different flow regimes for upstream and downstream wakes have been identified and discussed with the change in Re, SR, and S Transitions in the wake flow are illustrated using vorticity contours, frequency spectra, and bifurcation diagram The level of wake synchronization in the upstream wake, downstream wake, and between both the wakes has been identified with the help of the cross correlation functionread more
Citations
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Numerical investigations of the flow-induced vibration of a three-dimensional circular cylinder with various symmetric strips attached
TL;DR: In this article , the effects of 22 types of symmetric strips on the 3D flows around a fixed cylinder were analyzed numerically and four types of FIV phenomena were recognized: initial and passive upper branches in vortex-induced vibration (VIV), the transition region from VIV to galloping, and pure galloping region.
Journal ArticleDOI
Effect of size and spacing on the wake characteristics of two spheres placed in tandem
TL;DR: In this article , the authors investigated the drift past two spheres placed in a tandem arrangement at a fixed Reynolds number (Re) of 300, where the Reynolds number is defined based on the diameter (D) of the downstream sphere (DS) and the freestream velocity at the inlet.
References
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Journal ArticleDOI
The empirical mode decomposition and the Hilbert spectrum for nonlinear and non-stationary time series analysis
Norden E. Huang,Zheng Shen,Steven R. Long,Man-Li C. Wu,Hsing H. Shih,Quanan Zheng,Nai-Chyuan Yen,C. C. Tung,Henry H. Liu +8 more
TL;DR: In this paper, a new method for analysing nonlinear and nonstationary data has been developed, which is the key part of the method is the empirical mode decomposition method with which any complicated data set can be decoded.
Journal ArticleDOI
On the identification of a vortex
Jinhee Jeong,Fazle Hussain +1 more
TL;DR: In this article, the authors propose a definition of vortex in an incompressible flow in terms of the eigenvalues of the symmetric tensor, which captures the pressure minimum in a plane perpendicular to the vortex axis at high Reynolds numbers, and also accurately defines vortex cores at low Reynolds numbers.
Journal ArticleDOI
Vortex Dynamics in the Cylinder Wake
TL;DR: A review of wake vortex dynamics can be found in this article, with a focus on the three-dimensional aspects of nominally two-dimensional wake flows, as well as the discovery of several new phenomena in wakes.
Journal ArticleDOI
The effects of interference between circular cylinders in cross flow
TL;DR: In this article, an attempt is made to categorize various cluster arrangements in terms of the number of pipes (cylinders), their mutual spacing and orientation to the oncoming current.
Journal ArticleDOI
Characteristics of the Flow around Two Circular Cylinders Arranged in Tandem : 1st Report
TL;DR: In this paper, the characteristics of the flow around two circular cylinders in a cross flow were investigated, and the dependence of the Reynolds number was recognized in the range of 1.1, 1.6, 2.3 and 3.0.