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Buoyancy and Stability for Submerged and Floating Bodies01:11

Buoyancy and Stability for Submerged and Floating Bodies

1.8K
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...
1.8K
Rigid Body Equilibrium Problems - II01:21

Rigid Body Equilibrium Problems - II

7.0K
A rigid body is in static equilibrium when the net force and the net torque acting on the system are equal to zero.
Consider two children sitting on a seesaw, which has negligible mass. The first child has a mass (m1) of 26 kg and sits at point A, which is 1.6 meters (r1) from the pivot point B; the second child has a mass (m2) of 32 kg and sits at point C. How far from the pivot point B should the second child sit (r2) to balance the seesaw?
7.0K
Rigid Body Equilibrium Problems - I00:49

Rigid Body Equilibrium Problems - I

4.4K
A rigid body is said to be in static equilibrium when the net force and the net torque acting on the system is equal to zero. To solve for rigid body equilibrium problems, do the following steps.
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Newtonian Fluid: Problem Solving01:18

Newtonian Fluid: Problem Solving

221
Newtonian fluids exhibit a constant viscosity, meaning their shear stress and shear strain rate are directly proportional. This property ensures a predictable and stable response to applied forces, maintaining a linear relationship between force and flow. Examples include water, air, and light oils, consistently demonstrating this proportional behavior regardless of external conditions.
A velocity gradient forms within the fluid when a Newtonian fluid is placed between two parallel plates, with...
221
Equation of Motion for a Rigid Body01:12

Equation of Motion for a Rigid Body

293
The movement of a rigid object can be understood through the equations that explain both translational and rotational motion about the center of mass of the object, point G. This center of mass is the point where the equation of motion for translational motion comes into play, as per Newton's Second Law.
The combined moments generated about the center of mass of the object are equal to the rate of change of the angular momentum of the body. An external force, when applied at a different...
293
Turbulent Flow: Problem Solving01:09

Turbulent Flow: Problem Solving

129
Carbonation is a process used to dissolve carbon dioxide gas in a liquid, commonly used in the production of carbonated beverages. Achieving efficient carbonation requires careful control of temperature, pressure, and flow conditions. By adjusting these parameters, carbonation efficiency can be maximized, producing a higher concentration of CO2 in the liquid.
Temperature is a key factor in CO2 solubility. In this case, the CO2 gas and the liquid are cooled to 20°C. Lower temperatures...
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相关实验视频

Updated: Jun 29, 2025

Cardiac Muscle-cell Based Actuator and Self-stabilizing Biorobot - PART 1
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Cardiac Muscle-cell Based Actuator and Self-stabilizing Biorobot - PART 1

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一个强大的算法,用于计算浮体动力学.

J Roenby1,2, S Aliyar3, H Bredmose3

  • 1Stromning Aps, Luftmarinegade 62, København K 1432, Denmark.

Royal Society open science
|April 5, 2024
PubMed
概括
此摘要是机器生成的。

FloatStepper 是一种用于计算流体动力学 (CFD) 模拟的新算法,它解决了浮体相互作用中增加的质量不稳定性问题. 它甚至可以对无质体进行稳定的模拟.

关键词:
在FloatStepper中使用.开放式的泡增加质量的增加质量.计算流体动力学的流体动力学.浮体动力学 浮体动力学数字方法 数字方法.

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科学领域:

  • 计算流体动力学 (CFD) 是一种计算流体动力学.
  • 流体结构相互作用 流体结构相互作用
  • 数学方法 数学方法

背景情况:

  • 增加质量的不稳定性是CFD模拟中常见的问题,涉及光体与密集流体相互作用.
  • 现有的合刚体运动和流体动力学的方法可能是计算上昂贵或不稳定的.

研究的目的:

  • 介绍FloatStepper,一种新的非代算法,用于稳定合刚性身体运动和不可压缩的流体流.
  • 在CFD模拟中解决和消除额外的质量不稳定问题.

主要方法:

  • 开发了一个非代算法,FloatStepper,用于刚体和不可压缩流体合.
  • 实施了一个探测器体运动策略来分解力和扭矩.
  • 将该算法集成为OpenFOAM.的开源扩展.

主要成果:

  • 在各种单相和双相流量基准案例中表现出优异的稳定性.
  • 成功启用了无质体的模拟,展示了强度.
  • 确定了改善网格运动的领域,以提高灵活性和预测能力.

结论:

  • 在CFD中,FloatStepper为模拟流体体相互作用提供了稳定高效的替代方案.
  • 开源实现促进了更广泛的采用和进一步开发.
  • 在网状运动的进一步改进可以扩大算法的适用性.