相关实验视频
Updated: Jul 16, 2025
06:42
Magnetically Induced Rotating Rayleigh-Taylor Instability
Published on: March 3, 2017
9.6K
旋转倾斜浮力层的不稳定性
Y Xiao1,2, J J Tao1, F H Busse3
1Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871, People's Republic of China.
Physical review. E
|September 19, 2023
概括
这项研究使用在旋转的分层流体中冷却的倾斜板模拟了katabatic流. 旋转诱导的科里奥利斯效应使流动不稳定,导致复杂的三维不稳定性,并影响波形态行为.
科学领域:
- 流体动力学 流体动力学
- 地质物理学 地质物理学
- 大气科学 大气科学
背景情况:
- 高度的卡塔巴流是由冷却的倾斜板块附近的边界层模拟的.
- 分层旋转流体在地球物理现象中至关重要.
研究的目的:
- 分析地解决一个倾斜浮力层的基流.
- 用线性稳定性分析来识别边界层中的不稳定模式.
- 调查科里奥利斯效应和板块倾斜角度对流动稳定性的影响.
主要方法:
- 倾斜浮力层的基流的分析解决方案.
- 线性稳定性分析以识别不稳定的流量模式.
- 检查固定的温度和同流边界条件.
主要成果:
- 发现了五种不稳定的模式:静止纵向滚动 (LR),斜滚动 (OR-1,OR-2) 和托尔米恩-施莱奇特 (TS) 波 (TS-1,TS-2).
- 科里奥利斯效应促进了三维的关键模式.
- 增加的倾斜角度和科里奥利斯效应增加了TS波的不稳定性.
- OR-1和OR-2模式分别在低和高倾斜角度占主导地位;TS-1可以在垂直附近占主导地位.
- TS波形模式跨度相速表现出方向变化与倾斜角度,除了一个例外.
结论:
- 科里奥利斯效应显著改变倾斜浮力层的稳定性,有利于立体流体结构.
- 平板倾斜角度和科里奥利斯强度是决定主导不稳定模式的关键参数.
- 了解这些不稳定性是建模高度 katabatic 流和相关的地质物理过程的关键.
相关概念视频
01:11Buoyancy and Stability for Submerged and Floating Bodies
1.9K
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...
1.9K
00:59Buoyancy
10.0K
When an object is placed in a fluid, it either floats or sinks. All objects in a fluid experience a buoyant force. For example, a metal ball sinks, while a rubber ball floats. Similarly, a submarine can sink and float by adjusting its buoyancy. The concept of buoyancy raises several interesting questions. For instance, where does this buoyant force come from? How much buoyant force is required to make an object sink or float? Do objects that sink get any support at all from the...
10.0K
01:28Irrotational Flow
484
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:
484
01:18Boundary Layer Characteristics
172
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...
172
01:12Fluid 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
01:23Lift
184
Lift is a fundamental aerodynamic force that acts perpendicular to the direction of airflow. It plays a central role in achieving and sustaining flight and in stabilizing various vehicles. Lift primarily originates from pressure differences created across surfaces, such as an airfoil. A lower pressure region forms above the wing, while a higher pressure region forms below it, generating an upward force. This differential results from the shape and orientation of the airfoil, enabling the wing...
184