相关实验视频
Updated: Jun 12, 2025
06:42
Magnetically Induced Rotating Rayleigh-Taylor Instability
Published on: March 3, 2017
9.5K
在理想介质中的非线性,单模,二维雷利-泰勒不稳定性
A R Piriz1, J J López Cela1, S A Piriz2
1Instituto de Investigaciones Energéticas (INEI), E.T.S.I.I., and CYTEMA, <a href="https://ror.org/05r78ng12">Universidad de Castilla-La Mancha</a>, 13071 Ciudad Real, Spain.
Physical review. E
|September 19, 2024
概括
一个新的模型解释了雷利-泰勒不稳定性,捕捉了向非线性行为的过渡. 它通过自然计算流体质量来解决浮力-拖延模型的问题,解释速度和和加速.
科学领域:
- 流体动力学 流体动力学
- 等离子体物理学的物理学
- 天体物理现象 天体物理现象
背景情况:
- 雷利-泰勒不稳定性在各种物理系统中至关重要.
- 像浮力拖延模型 (BDM) 这样的现有模型在解释非线性行为方面存在局限性.
- 了解不稳定的进化是预测从惯性限制融合到超新星进化的现象的关键.
研究的目的:
- 为二维雷利-泰勒不稳定性开发一个扩展模型.
- 描述从线性到非线性系统的过渡.
- 解决先前模型的局限性,包括速度和和再加速阶段.
主要方法:
- 基于牛顿第二定律的先前线性模型的扩展.
- 包括参与不稳定的流体质量.
- 在不稳定的进化过程中分析横移的质量.
主要成果:
- 该模型自然预测了泡和尖峰速度和,没有阻力术语.
- 它解释了泡再加速而不引起凯尔文-赫尔姆霍尔茨不稳定性.
- 该模型与BDM完全一致,但扩展了其适用性并解决了一些问题.
结论:
- 开发的模型提供了一个更一致的雷利-泰勒不稳定的物理图像.
- 它成功地捕捉了非线性动态,包括速度和和加速.
- 这项工作为各种科学领域的流体不稳定性提供了更全面的理解.
更多相关视频
相关概念视频
01:26Linear Approximation in Frequency Domain
88
Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear....
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear....
88
01:17Steady, Laminar Flow Between Parallel Plates
148
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
148
01:28Irrotational Flow
421
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:
421
01:23Steady, Laminar Flow in Circular Tubes
166
Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is...
166
01:28Navier–Stokes Equations
435
For incompressible Newtonian fluids, where density remains constant, stresses show a linear relationship with the deformation rate, defined by normal and shear stresses. Normal stresses depend on the pressure exerted on the fluid and the rate of deformation in specific directions, which determines how fluid flows under varying pressures. Shear stresses, on the other hand, act tangentially across fluid layers. They explain how adjacent fluid layers slide relative to one another, connecting...
435
01:07Propagation of Waves
2.3K
When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
2.3K