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Buoyancy and Stability for Submerged and Floating Bodies01:11

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In fluid mechanics, buoyancy and stability are key concepts for understanding the behavior of submerged and floating bodies. When a stationary body is fully or partially submerged in a fluid, the fluid exerts a force on the body known as the buoyant force. This force acts vertically upward through a point called the center of buoyancy, which is the center of the displaced fluid volume. According to Archimedes' principle, the magnitude of the buoyant force is equal to the weight of the fluid...
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Hydrostatic pressure on curved surfaces is a fundamental concept in fluid mechanics with broad applications in the civil engineering field. When fluid is in contact with a curved surface, as in a reservoir, dam, or storage tank, it exerts pressure that varies in magnitude and direction along the curved surface. To assess the total hydrostatic force exerted by the fluid on a curved structure, engineers typically isolate the fluid volume adjacent to the surface and analyze the forces acting on...
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When a plane surface is submerged in a fluid, hydrostatic forces develop on the surface due to the fluid's pressure. For horizontal surfaces, the pressure exerted by the fluid is uniform because the depth remains constant. The resultant force is determined by the pressure at the given depth multiplied by the area of the surface, and it acts through the centroid of the surface. For vertical surfaces, the pressure varies with depth, increasing as the distance from the fluid's free surface...
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The high speed of electrical signals results from the fact that the force between charges acts rapidly at a distance. Thus, when a free charge is forced into a wire, the incoming charge pushes other charges ahead due to the repulsive force between like charges. These moving charges move the charges farther down the line. The density of charge in a system cannot easily be increased, so the signal is passed on rapidly. The resulting electrical shock wave moves through the system at nearly the...
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Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
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Consider a truck trying to pull a stationary car. As the truck exerts a force on the car, static friction is created at the point of contact between the two surfaces. This frictional force resists the car's movement and keeps it at rest. However, when the applied force by the truck surpasses the limiting static frictional force, an interesting phenomenon occurs. The frictional force at the interface reduces to a lower value, known as the kinetic frictional force. At this point, the car...
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使用水下车辆的生物槽表面减少拖.

Shihao Zheng1, Xi Liang2, Jiayong Li1

  • 1School of Civil Engineering, Tianjin University, Tianjin, China.

Frontiers in bioengineering and biotechnology
|September 11, 2023
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概括
此摘要是机器生成的。

这项研究引入了一种新的生物槽表面,灵感来自杀手的皮肤,以减少船只的阻力. 这种创新的设计大大减少了摩擦和总阻力,提高了海运的能源效率.

关键词:
生物建模生物建模降低阻力减轻阻力减轻阻力槽面表面的槽面表面是什么杀手是一种杀手.数字模拟的数字模拟.

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科学领域:

  • 流体动力学和水力动力学
  • 生物工程和生物仿真学
  • 海军建筑和海洋工程

背景情况:

  • 减少拖延对于提高能源效率和降低航运行业的燃料消耗至关重要.
  • 现有的阻力减小方法在各种流量条件下经常面临有效性和适用性的局限性.
  • 海洋动物的独特皮肤结构,如杀手,为新的生物模拟阻力减轻策略提供了潜力.

研究的目的:

  • 开发和评估一种新的非光滑表面阻力减轻方法,其灵感来源于杀手的皮肤脊结构.
  • 研究横向生物槽表面在减少船体阻力和提高能源效率方面的有效性.
  • 为了确定生物槽表面的最佳设计参数,以最大限度地减少阻力.

主要方法:

  • 创建横向的生物槽表面,模仿杀手的皮肤脊,与流动方向垂直对齐.
  • 运用计算机流体动力学 (CFD) 模拟,采用剪切应力传输k-ω模型.
  • 分析槽参数 (宽度与深度比,槽深度) 和入口速度对阻力减速性能的影响.

主要成果:

  • 确定了生物槽表面的最佳形状参数,从而有效地减少了阻力.
  • 在212 m/s的速度范围内观察到显著的阻力减少.
  • 实现了26.91%的摩擦阻力减速比和9.63%的总阻力减速比.

结论:

  • 拟议的横向生物槽表面通过减轻粘性和雷诺兹应力来有效地减少阻力.
  • 这种仿生方法为提高海上运输的能源效率和节省燃料提供了一个有希望的解决方案.
  • 这项研究验证了模拟自然结构在海军建筑中的先进工程应用的潜力.