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相关概念视频

Typical Model Studies01:30

Typical Model Studies

448
Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
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Modeling and Similitude01:12

Modeling and Similitude

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Scaled modeling is a fundamental technique in engineering, enabling the study of large and complex systems by creating smaller, manageable replicas that recreate critical characteristics of the original. In hydrology and civil infrastructure, for example, scaled models of dams help analyze water flow, turbulence, and pressure. This method allows for accurate predictions of real-world behavior within a controlled environment, significantly reducing the cost and time involved in full-scale...
346
Design Example: Creating a Hydraulic Model of a Dam Spillway01:21

Design Example: Creating a Hydraulic Model of a Dam Spillway

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Scaled hydraulic models of dam spillways provide a practical way to replicate and study the intricate flow dynamics of these structures. Often built to a 1:15 ratio, these models allow for observing critical water behavior, such as velocity distribution, flow patterns, and energy dissipation.
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Fluid Pressure over Curved Plate of Constant Width01:12

Fluid Pressure over Curved Plate of Constant Width

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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...
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Fluid Pressure over Flat Plate of Constant Width01:05

Fluid Pressure over Flat Plate of Constant Width

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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...
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General External Flow Characteristics01:26

General External Flow Characteristics

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The study of external flow is essential for creating structures and objects that interact efficiently and safely with moving fluids, such as air or water. When a body is immersed in a flowing fluid, it experiences two primary forces: drag, which opposes motion along the flow direction, and lift, which acts perpendicular to the flow. The shape, size, and orientation of the object influence these forces.Streamlined and Blunt Bodies in External FlowObjects in fluid flow are classified as...
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相关实验视频

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Flapping Soft Fin Deformation Modeling using Planar Laser-Induced Fluorescence Imaging
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使用二维CFD模型对曼塔射线的水力动力性能进行研究.

Wenxian Li1,2, Kai Ni2, Cunjun Li1

  • 1Zhoushan Institute of Calibration and Testing for Quality and Technology Supervision, Zhoushan 316021, China.

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|June 25, 2025
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概括

研究人员通过调整动力学参数来优化鱼的游泳. 具有特定波数的低振幅,高频运动最大限度地提高推力和能源效率,以获得更好的水力动力性能.

关键词:
波动的运动波动的运动.动力学是动力学.鱼鱼的胸 鱼的胸推进力是一种推进力.准推进效率效率 准推进效率

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科学领域:

  • 流体动力学 流体动力学
  • 生物机械工程 生物机械工程
  • 海洋生物学 海洋生物学

背景情况:

  • 计算流体动力学 (CFD) 是研究鱼水力学的主要方法.
  • 了解鱼的游泳机制对于仿生设计和生态研究至关重要.

研究的目的:

  • 为了研究动力学参数对鱼鱼水力动力学性能的影响.
  • 为了确定最大化推力和推进效率的最佳参数.

主要方法:

  • 一个2D计算流体动力学 (CFD) 模型被开发和验证.
  • 模拟集中在波数,振幅和频率对胸性能的影响上.
  • 进行了直角实验,以确定峰值性能条件.

主要成果:

  • 通过低振幅,高频推进和最佳波数实现最佳的能源利用.
  • 在1Hz频率,0.3c振幅和0.4波数下观察到8.55N的最大推力.
  • 在0.8 Hz频率,0.3 c振幅和0.4 波数下,准推进效率的峰值达到了82.4%.

结论:

  • 调节波数 (0.35-0.4),频率 (0.7-0.9 Hz) 和振幅 (0.3-0.325 c) 可以提高性能.
  • 这种最佳配置产生推力>3.04N和效率>70.4%.
  • 这些发现为设计高效的水上机动系统提供了洞察力.