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相关概念视频

Typical Model Studies01:30

Typical Model Studies

340
Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
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Fluid Pressure over Curved Plate of Constant Width01:12

Fluid Pressure over Curved Plate of Constant Width

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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...
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Design Example: Creating a Hydraulic Model of a Dam Spillway01:21

Design Example: Creating a Hydraulic Model of a Dam Spillway

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Scaled hydraulic models of dam spillways provide a practical way to replicate and study the intricate flow dynamics of these structures. Often built to a 1:15 ratio, these models allow for observing critical water behavior, such as velocity distribution, flow patterns, and energy dissipation.
124
Modeling and Similitude01:12

Modeling and Similitude

245
Scaled modeling is a fundamental technique in engineering, enabling the study of large and complex systems by creating smaller, manageable replicas that recreate critical characteristics of the original. In hydrology and civil infrastructure, for example, scaled models of dams help analyze water flow, turbulence, and pressure. This method allows for accurate predictions of real-world behavior within a controlled environment, significantly reducing the cost and time involved in full-scale...
245
Pressure Variation in a Fluid at Rest01:11

Pressure Variation in a Fluid at Rest

220
In a fluid at rest, the pressure at any point beneath the fluid surface depends solely on the depth, not on the container's shape or size. This principle, known as hydrostatic pressure, arises because, in stationary fluids, there is no acceleration, meaning the forces within the fluid balance out. Only vertical forces, caused by the weight of the fluid above, contribute to pressure changes with depth.
When measuring pressure at two different levels within the fluid, the difference in...
220
Fluid Pressure over Flat Plate of Variable Width01:02

Fluid Pressure over Flat Plate of Variable Width

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When a flat plate is submerged in a fluid, the fluid exerts pressure on the plate. This pressure can lead to many different phenomena, including drag and buoyancy. To understand the behavior of the fluid over a flat plate of variable width, it is essential to analyze the distribution of the pressure exerted.
The pressure distribution on the plate can be calculated by determining the force that acts on a differential area strip of the plate. Thus, the magnitude of the force is equal to the...
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静脉的三维流体结构相互作用建模使用沉浸边界/有限元素方法.

Bo Wang1, Liuyang Feng2, Lei Xu3

  • 1Research Center for Mathematics and Interdisciplinary Sciences, Shandong University, Qingdao, 266237, China.

Computers in biology and medicine
|December 4, 2024
PubMed
概括

这项研究使用3D模拟来模拟静脉中的血流和相互作用. 研究结果揭示了门运动,压力和与疾病相关的变化如何影响静脉血液动力学.

关键词:
流体结构的相互作用.浸泡边界有限元方法.一个三维的框架.静脉的门 静脉的门

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科学领域:

  • 生物医学工程 生物医学工程
  • 流体动力学 流体动力学
  • 计算生物学 计算生物学

背景情况:

  • 静脉疾病,如静脉和深静脉血栓形成,显著影响患者的健康,需要更好地了解临床管理.
  • 当前的研究往往依赖于简化的模型,需要先进的计算方法来准确地捕捉复杂的静脉血液动力学.

研究的目的:

  • 开发和使用3D数值模拟框架来研究血液流和静脉之间的流体结构相互作用 (FSI).
  • 分析静脉和血液流动的动态行为,并量化整个心脏周期的关键生理参数.
  • 探索静脉疾病背后的机制,包括液压压力和门结构变化的影响.

主要方法:

  • 一个三维 (3D) 数值模拟,采用沉浸边界/有限元素方法.
  • 利用超弹性构成模型来模拟静脉的不可压缩,非线性机械反应.
  • 分析了血流和静脉之间的流体结构相互作用 (FSI),包括应力-应变分布.

主要成果:

  • 证明了与心脏周期同步的周期性门运动和血液流动模式.
  • 量化生理参数:血压,流量和几何孔面积.
  • 确定了动态门运动和旋形成之间的显著相关性;揭示了门自由边缘的应力/应变度,与2D模型不同.
  • 建立了增加的静水静脉压力作为静脉血管扩张的主要驱动因素.
  • 对比了静脉纤维化和缩的血液动力学影响.

结论:

  • 3D FSI框架为静脉系统提供了一个全面的模型,这对于理解静脉疾病机制至关重要.
  • 这些发现为静脉疾病的发展和进展提供了关键的见解,支持预防,诊断和治疗策略.
  • 强调3D建模对于准确捕捉静脉血液动力学和门功能的重要性.