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相关概念视频

Frictional Force01:07

Frictional Force

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When a body is in motion, it encounters resistance because the body interacts with its surroundings. This resistance is known as friction, a common yet complex force whose behavior is still not completely understood. Friction opposes relative motion between systems in contact, but also allows us to move. Friction arises in part due to the roughness of surfaces in contact. For one object to move along a surface, it must rise to where the peaks of the surface can skip along the bottom of the...
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Accelerating Fluids01:17

Accelerating Fluids

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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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Mesh Analysis01:20

Mesh Analysis

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Mesh analysis is a valuable method for simplifying circuit analysis using mesh currents as key circuit variables. Unlike nodal analysis, which focuses on determining unknown voltages, mesh analysis applies Kirchhoff's voltage law (KVL) to find unknown currents within a circuit. This method is particularly convenient in reducing the number of simultaneous equations that need to be solved.
A fundamental concept in mesh analysis is the definition of meshes and mesh currents. A mesh is a closed...
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Surface Tension of Fluid01:22

Surface Tension of Fluid

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Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies...
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Hydrostatic Pressure Force on a Curved Surface01:04

Hydrostatic Pressure Force on a Curved Surface

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Hydrostatic pressure on curved surfaces is a fundamental concept in fluid mechanics with broad applications in the civil engineering field. When fluid is in contact with a curved surface, as in a reservoir, dam, or storage tank, it exerts pressure that varies in magnitude and direction along the curved surface. To assess the total hydrostatic force exerted by the fluid on a curved structure, engineers typically isolate the fluid volume adjacent to the surface and analyze the forces acting on...
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Hydrostatic Pressure Force on a Plane Surface01:04

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When a plane surface is submerged in a fluid, hydrostatic forces develop on the surface due to the fluid's pressure. For horizontal surfaces, the pressure exerted by the fluid is uniform because the depth remains constant. The resultant force is determined by the pressure at the given depth multiplied by the area of the surface, and it acts through the centroid of the surface. For vertical surfaces, the pressure varies with depth, increasing as the distance from the fluid's free surface...
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用GPU加速的无网格计算框架来建模摩擦表面化过程.

Ahmed Elbossily1, Zina Kallien1,2, Rupesh Chafle2

  • 1Institute for Production Technology and Systems, Leuphana Universität Lüneburg, Universitätsallee 1, 21335 Lüneburg, Germany.

Computational particle mechanics
|November 3, 2025
PubMed
概括
此摘要是机器生成的。

这项研究引入了一个无网格的光滑粒子水力学 (SPH) 框架,用于摩擦表面 (FS) 建模. 该GPU加速模型准确地预测了合金中的热力学行为和沉积机制.

关键词:
摩擦表面上的摩擦.在GPU计算中使用GPU计算.没有网格的方法.平滑的粒子水力动力学.

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科学领域:

  • 计算力学是计算力学.
  • 材料科学 是一种材料科学.
  • 制造过程中的制造工艺.

背景情况:

  • 摩擦表面 (FS) 是一种固态增材制造工艺.
  • 精确的FS建模需要强大的模拟技术来捕捉复杂的热力学现象.
  • 现有的模型可能缺乏准确预测材料沉积和行为的可靠性.

研究的目的:

  • 开发和验证一个无网格计算框架来建模摩擦表面过程.
  • 调查FS期间的热力学行为和沉积机制.
  • 为优化FS过程参数和了解材料流提供一个工具.

主要方法:

  • 使用无网状光滑粒子水力学 (SPH) 方法进行模拟.
  • 实现GPU计算,以提高计算效率.
  • 综合优化技术 (粒子切换,子域划分) 和稳定性增强 (人工粘度,应力,核校正).
  • 开发了一种基于连接温度和临界剪压的新型材料分离标准.

主要成果:

  • 该SPH模型准确地预测了AA5083摩擦表面的轴力,温度概况和沉积体几何.
  • 模拟显示了工艺参数对沉积物宽度和厚度的关键依赖.
  • 获得了对材料流,沉积分布和棒闪光形成的深入见解,与实验数据保持一致.
  • 在棒闪和沉积物中观察到高塑性应变,集中在前进侧面.

结论:

  • 经过验证的3D SPH框架是一个强大的工具,用于预测摩擦表面的热力学行为.
  • 该模型为沉积机制提供了宝贵的见解,有助于过程理解和优化.
  • 这种方法提升了固态增材制造技术的模拟能力.