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相关概念视频

Uniform Depth Channel Flow: Problem Solving01:18

Uniform Depth Channel Flow: Problem Solving

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To calculate the flow rate for a trapezoidal channel, first, identify the bottom width, side slope, and flow depth of the channel. The cross-sectional area (A) corresponding to the depth of flow (y), channel bottom width (B), and side slope (θ) is determined by:Next, calculate the wetted perimeter, which includes the bottom width and the sloped side lengths in contact with the water. Using the values of the cross-sectional area and the wetted perimeter, determine the hydraulic radius by...
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Turbulent Flow: Problem Solving01:09

Turbulent Flow: Problem Solving

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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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Newtonian Fluid: Problem Solving01:18

Newtonian Fluid: Problem Solving

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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.
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Laminar Flow: Problem Solving01:24

Laminar Flow: Problem Solving

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Laminar flow occurs when a fluid moves smoothly in parallel layers with minimal mixing and turbulence. In fluid mechanics, ensuring laminar flow within a pipe is essential for precise control of flow characteristics, especially in engineering applications. The key factor in determining whether flow remains laminar is the Reynolds number, a dimensionless quantity that depends on the fluid's velocity, density, viscosity, and the pipe's diameter. A Reynolds number of 2100 or lower...
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Laminar and Turbulent Flow01:07

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Fluid dynamics is the study of fluids in motion. Velocity vectors are often used to illustrate fluid motion in applications like meteorology. For example, wind—the fluid motion of air in the atmosphere—can be represented by vectors indicating the speed and direction of the wind at any given point on a map. Another method for representing fluid motion is a streamline. A streamline represents the path of a small volume of fluid as it flows. When the flow pattern changes with time, the...
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The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.
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相关实验视频

Updated: Jul 20, 2025

Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package
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muFlowReacT:一个图书馆来解决在非结构化的网格上的多相多元件反应式运输.

O Atteia1, H Prommer2,3, D Vlassopoulos4

  • 1UMR EPOC, Bordeaux-INP, 1 Allee Daguin, 33607, Pessac Cedex, France.

Ground water
|July 31, 2023
PubMed
概括

一个新的反应式运输代码通过将OpenFoam和PhreeqcRM结合起来,有效地模拟地下水质量问题. 这种先进的工具最大限度地减少了数值分散,为复杂的水文地质挑战提供了多功能解决方案.

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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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相关实验视频

Last Updated: Jul 20, 2025

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Optical Coherence Tomography Based Biomechanical Fluid-Structure Interaction Analysis of Coronary Atherosclerosis Progression
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科学领域:

  • 环境科学 环境科学
  • 水文地质学 水文地质学
  • 计算科学 计算科学

背景情况:

  • 地下水质量模拟面临数值分散的挑战.
  • 像MODFLOW/MT3DMS这样的现有模型在非结构化网格上的多功能性和计算效率都有局限性.
  • 专用工具的合是一种可行的策略,可以增强模拟能力.

研究的目的:

  • 为高效的地下水质量模拟开发一种新型的反应式运输代码.
  • 将已建立的代码 (MODFLOW/MT3DMS) 的功能转移和扩展到用于非结构化电网的灵活,高效的平台.
  • 集成先进的功能,如多相传输和不和区过程.

主要方法:

  • 合OpenFoam (计算流体动力学) 和PhreeqcRM (反应式运输模型).
  • 利用OpenFoam广泛的传输解决方案来提高数值稳定性和效率.
  • 在非结构化网格上实现,以获得更大的几何灵活性.
  • 通过各种模拟示例进行验证.

主要成果:

  • 新的代码有效地抑制了数值分散,这与以前的方法相比是一个关键优势.
  • 在模拟各种场景方面表现出能力:和溶液运输,不和气体扩散与反应,复杂的3D反应运输和二氧化碳注射影响.
  • 成功整合了气态化合物和多相运输的扩散过程.

结论:

  • 开发的代码为地下水质量和反应式运输问题提供了高效和多功能解决方案.
  • OpenFoam和PhreeqcRM的结合为未来的代码扩展和应用提供了一个强大的框架.
  • 代码的灵活性和准确性通过多个复杂的案例研究得到验证,包括地质化学反应和二氧化碳封存.