在一个有横向风波动的正方形圆柱体上模拟旋激发力的大尖端模拟
Huanhuan Du1, Zikai Fan2, Wei He3
1Wenzhou Key Laboratory of Intelligent Lifeline Protection and Emergency Technology for Resilient City, College of Architecture and Energy Engineering, Wenzhou University of Technology, Wenzhou, 325035, China.
Scientific reports
|August 30, 2023
概括
横向风的波动可以激发方圆气,特别是在0.05.5以上的频率. 逆风障碍产生这些波动,但它们的影响随着距离的增长而减弱,在8-10个气大小之外消失.
科学领域:
- 流体动力学 流体动力学
- 空气动力学 航空动力学
- 计算力学 计算力学 计算力学
背景情况:
- 了解结构上的横风力对设计至关重要.
- 横向风的波动可以在悬崖体中引起共振振动.
研究的目的:
- 为了研究横向风的波动频率对正方形圆柱体的影响.
- 为了比较波动生成方法:正弦函数和上风屏障.
主要方法:
- 使用了3D大端模拟 (LES).
- 使用入口正弦函数和上风屏障生成波动.
- 使用斯特鲁哈尔数来规范频率.
主要成果:
- 0.05以上的正常频率将圆柱体横向激发.
- 一个障碍物大小是气大小的0.5倍,保持了频率效应.
- 一个障碍物大小是气大小的2.5倍,产生了无效的低频波动 (St = 0.04).
- 逆风屏障效应随着距离的增长而减弱,在8-10个气大小时消失.
结论:
- 频率是对方风激发方圆圆柱体的一个关键参数.
- 上风屏障的特性 (大小和距离) 显著调节诱导的风波动及其激发潜力.
相关概念视频
Steady, Laminar Flow in Circular Tubes
250
Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is...
250
Steady, Laminar Flow Between Parallel Plates
231
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
231
Fluid Pressure over Flat Plate of Variable Width
1.8K
When a flat plate is submerged in a fluid, the fluid exerts pressure on the plate. This pressure can lead to many different phenomena, including drag and buoyancy. To understand the behavior of the fluid over a flat plate of variable width, it is essential to analyze the distribution of the pressure exerted.
The pressure distribution on the plate can be calculated by determining the force that acts on a differential area strip of the plate. Thus, the magnitude of the force is equal to the...
The pressure distribution on the plate can be calculated by determining the force that acts on a differential area strip of the plate. Thus, the magnitude of the force is equal to the...
1.8K
Fluid Pressure over Curved Plate of Constant Width
1.6K
When a curved plate of constant width is submerged in a liquid, the pressure acting normal to the plate varies continuously both in magnitude and direction. Calculating the magnitude and location of the resultant force at a point is often challenging for such cases. One of the methods to determine the resultant force and its location involves separately calculating the horizontal and vertical components of the resultant force. This complex calculation can be simplified by representing the...
1.6K
Bernoulli's Equation for Flow Along a Streamline
1.0K
Bernoulli's equation relates the energy conservation in a fluid moving along a streamline. The equation applies to incompressible and inviscid fluids under steady flow. For such a flow, Newton's second law is applied to a small fluid element, which experiences forces due to pressure differences, gravity, and velocity variations. The force balance leads to the following form of Bernoulli's equation:
1.0K
Fluid Pressure over Flat Plate of Constant Width
2.1K
When a body is submerged in water, it experiences fluid pressure acting normal on its surface and distributed over its area. For better design structures, it is crucial to determine the magnitude and location of the resultant force acting on the surface. In the case of a rectangular plate of constant width submerged in water, the pressure increases with depth, resulting in a linearly varying trapezoidal pressure distribution from the upper to the lower edge of the plate.
The resultant force...
The resultant force...
2.1K


