Numerical study of aperiodic phenomena past two staggered rows of cylinders in cross-flow

Anagnostopoulos, Petros V.; Seitanis, S.

doi:10.1016/j.oceaneng.2014.09.049

Cited by 13 publications

(5 citation statements)

References 24 publications

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“…The current solution to avoiding failures due to flow-induced vibration in steam generators is to adopt a conservative approach array pitch (m) P Â pressure at angle Â (Pa) Âˇangle of axially tapped instrumented cylinder Â˛reference angle on circumferentially tapped instrumented cylinder the intermittent switching of a jet of fluid in the wake of two or more cylinders positioned normal to the flow. It has been observed both experimentally and in computer simulations consisting of two cylinders side by side, single and double rows of tubes (Guillaume and LaRue, 1999;Zdravkovich and Stonebanks, 1990;Kim and Durbin, 1988;Mahbub Alam et al, 2003;Bearman and Wadcock, 1973) and in tube array bundles (Anagnostopoulos and Seitanis, 2012;Afgan et al, 2011;Olinto et al, 2006;de Paula and Möller, 2012;Khalifa et al, 2013). It has been found that arrays that are prone to bi-stable flow do not have a stable limit cycle amplitude at instability as observed by Mahon andMeskell (2009a, 2012).…”

Section: Introductionmentioning

confidence: 85%

Bi-stable flow in parallel triangular tube arrays with a pitch-to-diameter ratio of 1.375

Keogh

Meskell

2015

Nuclear Engineering and Design

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Section: Introductionmentioning

confidence: 85%

Bi-stable flow in parallel triangular tube arrays with a pitch-to-diameter ratio of 1.375

Keogh

Meskell

2015

Nuclear Engineering and Design

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“…They observed variations in physical parameters for different values of g. An empirical relation for average mean drag coefficient and average Strouhal number was also given for both aspect ratios and the values of average C dmean and average St approaches to single isolated rectangular cylinder for increasing g [20,21]. Anagnostopouls and Seitanis [22] numerically studied cross-flow past two staggered rows of cylinders at Re = 200, where the upstream row contains three and downstream row contains four cylinders using the finite element method at g = 0-1. They observed that the drag force exerted on the upstream row is higher than downstream row of cylinders and the wake switched behind the cylinders at downstream row.…”

Section: Introductionmentioning

confidence: 97%

A two-dimensional lattice Boltzmann study of flow past five side-by-side rectangular cylinders

Islam

Rahman

Ying

2018

J Braz. Soc. Mech. Sci. Eng.

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Numerical simulations are performed, in the range of 0.5 B g B 5, where g is the separation ratio between the cylinders at fixed Reynolds number 150 and aspect ratio 2, for flow past five side-by-side rectangular cylinders. A two-dimensional code is developed using the lattice Boltzmann method. The effect of separation ratio on the vortex shedding frequency, time-trace analysis of drag and lift coefficients, power spectra analysis of lift coefficients and force statistics exerted on the cylinders is quantified together with the observed flow structure. Five different flow structures were found and named as nearly symmetric (g = 0.5), flip-flopping (g = 1), modulated (g = 1.5), strongly interactive (g = 2, 2.5 and 3) and weakly interactive (g = 4 and 5) flow structures. It is found that the vortices are generated on the surfaces of the cylinders as width of the cylinder is 2h (h is the width of the rectangular cylinders) and due to this there is modulation in time-history analysis of drag and lift coefficients for all chosen cases except at g = 0.5. The Strouhal number is also calculated using Welch's method for comparison, and correlation of lift coefficients for different combinations is also given.

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“…A numerical examination of cross flow past two staggered row of circular cylinders at Re = 200, transverse spacing value 3 and varying streamwise gap spacing's from 0 to 1, was performed by Anagnostopoulos and Seitanis [18]. They obtained that stream wise gap spacing's greatly affect the flow regimes and hydrodynamic characteristics of the flow.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of drag and lift forces acting on a group of square cylinders at various staggered arrangements

Fezai,

oueslati,

Ben-Beya

2024

Preprint

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Two-dimensional numerical investigation is conducted for incompressible fluid flow around staggered square cylinders at different arrangements. The in-house code is firstly validated for flow around a single square cylinder by comparing the results with results present in literature and fair agreement is obtained. The calculations are carried out for several values of Reynolds numbers (Re) ranging from 1 to 120. Aerodynamic features, involving the lift (CL) and drag (CD) coefficients, are predicted and analyzed for three arrangements. Besides, the physical parameters and the flow pattern in the wake are presented by varying the Reynolds number. Sensitivity of the CL and CD values to the change in the arrangement of the square cylinders is analyzed. The numerical outcomes of the present study demonstrate that changing the arrangements of cylinders dramatically the fluctuation of the lift and drag coefficients values relatively to each square cylinder. Moreover, computation analysis reveals that the CD and CL evolutions depend significantly on the different cylinder combinations and the variation of Reynolds number as well.

show abstract

Numerical study of aperiodic phenomena past two staggered rows of cylinders in cross-flow

Cited by 13 publications

References 24 publications

Bi-stable flow in parallel triangular tube arrays with a pitch-to-diameter ratio of 1.375

Bi-stable flow in parallel triangular tube arrays with a pitch-to-diameter ratio of 1.375

A two-dimensional lattice Boltzmann study of flow past five side-by-side rectangular cylinders

Numerical analysis of drag and lift forces acting on a group of square cylinders at various staggered arrangements

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