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相关概念视频

Accelerating Fluids01:17

Accelerating Fluids

994
When a fluid is in constant acceleration, the pressure and buoyant force equations are modified. Suppose a beaker is placed in an elevator accelerating upward with a constant acceleration, a. In the beaker, assume there is a thin cylinder of height h with an infinitesimal cross-sectional area, ΔS.
The motion of the liquid within this infinitesimal cylinder is considered to obtain the pressure difference. Three vertical forces act on this liquid:
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Newtonian Fluid: Problem Solving01:18

Newtonian Fluid: Problem Solving

174
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...
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Basic Postulates of Kinetic Molecular Theory: Particle Size, Energy, and Collision02:43

Basic Postulates of Kinetic Molecular Theory: Particle Size, Energy, and Collision

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The ideal-gas equation, which is empirical, describes the behavior of gases by establishing relationships between their macroscopic properties. For example, Charles’ law states that volume and temperature are directly related. Gases, therefore, expand when heated at constant pressure. Although gas laws explain how the macroscopic properties change relative to one another, it does not explain the rationale behind it.
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Collisions in Multiple Dimensions: Introduction01:05

Collisions in Multiple Dimensions: Introduction

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It is far more common for collisions to occur in two dimensions; that is, the initial velocity vectors are neither parallel nor antiparallel to each other. Let's see what complications arise from this. The first idea is that momentum is a vector. Like all vectors, it can be expressed as a sum of perpendicular components (usually, though not always, an x-component and a y-component, and a z-component if necessary). Thus, when the statement of conservation of momentum is written for a...
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Equilibrium Conditions for a Particle01:23

Equilibrium Conditions for a Particle

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When an object is in equilibrium, it is either at rest or moving with a constant velocity. There are two types of equilibrium: static and dynamic. Static equilibrium occurs when an object is at rest, while dynamic equilibrium occurs when an object is moving with a constant velocity. In both cases, there must be a balance of forces acting on the object.
To understand the concept of equilibrium, let us first consider the forces acting on an object. When different forces act on an object, they can...
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Conservation of Linear Momentum for a System of Particles01:28

Conservation of Linear Momentum for a System of Particles

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In the dynamic realm of billiards, a fascinating interplay of forces governs the motion of cue balls and stationary balls. When the cue ball collides with a stationary ball, linear momentum is exchanged. The cue ball imparts a fraction of its linear momentum to the stationary ball, causing the cue ball to decelerate while initiating the motion of the stationary ball.
The impulsive force at play during this interaction is of extremely short duration, rendering its impulse negligible. When...
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Updated: May 27, 2025

Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package
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积极极性流体的多粒子碰撞框架.

Oleksandr Baziei1, Benjamín Loewe2, Tyler N Shendruk1

  • 1University of Edinburgh, School of Physics and Astronomy, The , Peter Guthrie Tait Road, Edinburgh EH9 3FD, United Kingdom.

Physical review. E
|February 20, 2025
PubMed
概括
此摘要是机器生成的。

我们开发了一种用于活跃极流体的中等尺度模拟方法,这对于理解生物系统至关重要. 这种新方法捕捉了群体的行为,并允许研究复杂的场景,如外部领域和障碍物.

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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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科学领域:

  • 软物质物理学 软物质物理学
  • 活体物质模拟活动实验
  • 中等尺度的水力动力学.

背景情况:

  • 在生物学中常见的密集活性悬浮物被建模为具有方向对称性的活性流体.
  • 现有的中等尺度模拟专注于活跃的阴性流体,而极性流体缺乏可比方法.
  • 模拟极流体需要用于复杂几何形状和作为悬浮溶剂的中等尺度方法.

研究的目的:

  • 为模拟极性活性流体开发一个中等尺度的数值方法.
  • 为了适应多粒子碰撞动力学 (MPCD) 框架用于活跃极系统.
  • 研究活跃极流体在各种条件下的行为.

主要方法:

  • 应用了粗粒多粒子碰撞动力学 (MPCD) 框架.
  • 在Vicsek模型的基础上开发了三种积极极性MPCD (AP-MPCD) 变体.
  • 内置安德森和朗格文恒温器用于粒子速度放松.

主要成果:

  • 每个AP-MPCD变体都在关键活动时表现出蜂群过渡.
  • 在汇集过渡点附近观察到带状现象.
  • 在外部场 (破坏带) 和异型障碍物 (偏差方向) 下探索了聚合.

结论:

  • AP-MPCD方法有效地捕捉了已知的极性活性悬浮现象学.
  • 证明了AP-MPCD在复杂场景中研究活性极流体的多功能性.
  • 为模拟生物和软物质系统中的活性极流体提供了有价值的工具.