Numerical analysis of flow characteristics around a rigid thin plate

Jie WEI; Jianjun WU

doi:10.11990/jheu.202207051

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Numerical analysis of flow characteristics around a rigid thin plate

更新时间：2025-09-01

- Numerical analysis of flow characteristics around a rigid thin plate
- Journal of Harbin Engineering University Vol. 45, Issue 4, Pages: 699-708(2024)
- 作者机构：
  
  兰州大学土木工程与力学学院, 甘肃兰州 730000
- 作者简介：
- 基金信息：
- DOI：10.11990/jheu.202207051
  CLC： O357.1
- Received：25 July 2022，
  
  Online First：19 February 2024，
  
  Published：05 April 2024
- 稿件说明：
移动端阅览
Jie WEI, Jianjun WU. Numerical analysis of flow characteristics around a rigid thin plate[J]. Journal of Harbin Engineering University, 2024, 45(4): 699-708.
DOI：

Jie WEI, Jianjun WU. Numerical analysis of flow characteristics around a rigid thin plate[J]. Journal of Harbin Engineering University, 2024, 45(4): 699-708. DOI： 10.11990/jheu.202207051.

摘要

为了揭示雷诺数、来流剪切参数对平板尾流涡街演化过程以及平板阻力特性的影响规律

本文基于浸没边界-格子Boltzmann方法建立了刚性薄平板绕流模型

并在雷诺数为100~1200内

对不同雷诺数与来流剪切参数下的刚性薄平板绕流问题进行数值模拟。分别研究了平板尾流区沿流向的2次失稳跃迁过程以及平板流向载荷随来流剪切参数的变化及其对雷诺数的依赖性

并对其机理进行了讨论。研究表明: 随着流场剪切参数的增加

平板近尾流经过数次准周期分岔过程进入了由大尺度涡结构所主导的混沌状态

进一步诱发了低频、混沌的结构阻力; 雷诺数越大

向混沌特征流向载荷转变所需的临界剪切参数越小。

Abstract

To further investigate the influence of Reynolds number and inlet shear pa

rameter on the evolution of vortex street in the wake and resistance characteristics of a flat plate

a model based on the immersed boundary-lattice Boltzmann method is built to numerically simulate the flow around a rigid thin plate. The Reynolds number and inlet shear parameter were considered as controls. All simulations on the flow around flat plates were performed in the range of 100 ≤

≤ 1 200. The variation of two instability transition positions in the wake of plates and the drag exerted on the rigid plates with the shear parameter of the incoming flow

as well as their dependence on the Reynolds number

are extensively analyzed. The mechanisms are also discussed in detail. The results indicate that

after several quasi-periodic bifurcations

the wake flow transitions into the chaotic state with an increase in the shear parameter

characterized by large-scale vortex structures. The chaotic state of the wake flow further induces low-frequency chaotic drag force on the plates. Moreover

a small critical shear parameter is required for the transition to chaotic flow loads with high Reynolds numbers.

关键词

Keywords

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