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相关概念视频

Free Jet01:14

Free Jet

251
Free jets describe the flow of liquid exiting a reservoir through an opening into the atmosphere without resistance. The velocity (v) of the liquid jet is derived using Bernoulli's principle and expressed as:
251
Irrotational Flow01:28

Irrotational Flow

563
Irrotational flow is characterized by fluid motion where particles do not rotate around their axes, resulting in zero vorticity. For a flow to be irrotational, the curl of the velocity field must be zero. This imposes specific conditions on velocity gradients. For instance, to maintain zero rotation about the z-axis, the gradient condition:
563
Bernoulli's Equation for Flow Normal to a Streamline01:16

Bernoulli's Equation for Flow Normal to a Streamline

946
Bernoulli's equation for flow normal to a streamline explains how pressure varies across curved streamlines due to the outward centrifugal forces induced by the fluid's curvature. The pressure is higher on the inner side of the curve, near the center of curvature, and decreases outward to balance these centrifugal forces.
The pressure difference depends on the fluid's velocity and radius of curvature. The pressure variation is minimal in flows with nearly straight streamlines.
946
Coriolis Force01:23

Coriolis Force

4.2K
An accelerating particle experiences a force equal to the mass multiplied by the acceleration in an inertial frame of reference. Consider a particle in a non-inertial frame of reference, such as a sliding ball on a rotating table. The acceleration of the ball in this rotating reference frame is different than in the intertial frame, which modifies its equation of motion. The fictitious forces acting additionally on a rotating frame of reference alter Newton's Second Law expression.
4.2K
Bernoulli's Equation for Flow Along a Streamline01:30

Bernoulli's Equation for Flow Along a Streamline

1.1K
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:
1.1K
Boundary Layer Characteristics01:18

Boundary Layer Characteristics

228
When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...
228

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相关实验视频

Updated: Sep 15, 2025

Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow
13:02

Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow

Published on: February 27, 2016

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解释和预测南半球旋驱动的喷气式飞机.

Julia Mindlin1, Theodore G Shepherd2,3, Marisol Osman4,5,6

  • 1Leipzig Institute for Meteorology, Leipzig 04103, Germany.

Proceedings of the National Academy of Sciences of the United States of America
|July 14, 2025
PubMed
概括

全球变暖和远程驱动因素解释了南半球旋驱动喷气式 (EDJ) 转移. 气候模型准确地预测了度变化,但低估了EDJ的加强,突出了改善气候变化预测的必要性.

关键词:
南半球的南半球因果关系网络是因果关系网络.埃迪驱动的喷气式飞机.短期预测 短期预测故事情节 故事情节

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Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp
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Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp

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Visualization of High Speed Liquid Jet Impaction on a Moving Surface

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相关实验视频

Last Updated: Sep 15, 2025

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Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow

Published on: February 27, 2016

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Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp
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科学领域:

  • 大气科学 大气科学
  • 气候动力学 气候动力学
  • 南半球气象学 南半球气象学

背景情况:

  • 南半球旋转驱动喷气 (EDJ) 对区域天气模式和气候至关重要.
  • 全球气候模型 (GCM) 在准确预测EDJ趋势方面面临挑战,原因是热带变暖和平流层变化等远程驱动因素的不确定性.
  • 预测未来的EDJ行为对于了解区域气候影响至关重要.

研究的目的:

  • 开发一个因果框架来归因过去的EDJ变化.
  • 预测可能的EDJ的未来轨迹.
  • 弥合气候变化归因与预测之间的差距.

主要方法:

  • 结合观测数据,重新分析数据集和合模型对比项目 (CMIP) 的预测.
  • 开发了一个因果推理框架,与气候故事集成.
  • 分析了热带变暖和平流层极地加强对EDJ趋势的影响.

主要成果:

  • 热带变暖在CMIP预测的下端正在进展.
  • 平流层极地显示显著增强,影响观察到的EDJ趋势.
  • 全球变暖占据了观察到的EDJ度转移的50%;远程驱动器占据了其他50%,GW归因不确定.
  • GCMs准确地捕捉了观察到的度变化,但低估了EDJ的强化.

结论:

  • 开发的因果关系框架有效地捕捉了观察到的EDJ趋势,在某些方面表现优于标准GCM.
  • 将因果推理与气候故事情节相结合,为预测未来气候变化途径提供了一个物理基础的方法.
  • 这种方法提高了我们做出更可靠的气候变化预测和了解区域气候影响的能力.