Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Spectral Analysis of Flow Around Single and Two Crossing Circular Cylinders Arranged at 60 and 90 Degrees

Tianyuan Wang
,
Qingqing Yang
,
Yeting Tang
* ,
Hongda Shi
,
Qin Zhang
* ORCID logo ,
Mengfei Wang
,
Andrey Epikhin
ORCID logo ,
Andrey Britov
Version 1 : Received: 7 May 2022 / Approved: 10 May 2022 / Online: 10 May 2022 (10:11:48 CEST)

A peer-reviewed article of this Preprint also exists.

Wang, T.; Yang, Q.; Tang, Y.; Shi, H.; Zhang, Q.; Wang, M.; Epikhin, A.; Britov, A. Spectral Analysis of Flow around Single and Two Crossing Circular Cylinders Arranged at 60 and 90 Degrees. J. Mar. Sci. Eng. 2022, 10, 811. Wang, T.; Yang, Q.; Tang, Y.; Shi, H.; Zhang, Q.; Wang, M.; Epikhin, A.; Britov, A. Spectral Analysis of Flow around Single and Two Crossing Circular Cylinders Arranged at 60 and 90 Degrees. J. Mar. Sci. Eng. 2022, 10, 811.

Abstract

Two modal decomposition techniques, including proper orthogonal decomposition (POD) and dynamic mode decomposition (DMD), are used to identify the wake patterns past single and two crossing cylinders in 60° and 90° arrangements with gap ratio G = 4. The flow is simulated using direct numerical simulations (DNS) for Reynolds numbers Re = 100. The spatial scale of flow decreases with increasing modal frequency from the modal analysis. Two main modes are identified in the wake of the cylinders, namely spatially antisymmetric and symmetric modes. Antisymmetric and symmetric modes are related to cylinders’ vortex shedding and shedding vortices’ shift motion, respectively, whose frequencies are odd and even multiples of cylinders’ lift force frequency. In addition, a low-frequency mode concerning the shadowing effect of the downstream cylinder (DC) in 90° arrangement is found in the wake of the DC centre.

Keywords

low-dimensional models; vortex dynamics; wakes

Subject

Engineering, Marine Engineering

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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