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関連する概念動画

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.
A velocity gradient forms within the fluid when a Newtonian fluid is placed between two parallel plates, with...
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Laminar Flow: Problem Solving01:24

Laminar Flow: Problem Solving

480
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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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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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 Model01:34

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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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Turbulent Flow: Problem Solving01:09

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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 enhance...
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ハイブリッドLBM-FVMソルバーによる多相多成分流体シミュレーション

Lin Ding, Xiaopei Liu

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    まとめ
    この要約は機械生成です。

    本研究では、複雑な流体流れのための新しいハイブリッドソルバーを紹介します。この新しい手法は、メモリ使用量を削減しながら、流体-固体間相互作用を伴う多相多成分流体ダイナミクスを正確にシミュレートします。

    キーワード:
    ハイブリッドソルバー格子ボルツマン法有限体積法多相流多成分流体流体-固体間相互作用界面現象計算流体力学

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    科学分野:

    • 計算流体力学
    • 多相流シミュレーション
    • 流体-固体間相互作用モデリング

    背景:

    • 多相多成分流体流れは、シミュレーションにおいて大きな課題をもたらします。
    • 既存の手法は、精度、効率、安定性、またはメモリ消費量においてしばしば苦労します。
    • 流体-固体間相互作用を組み込むことは、これらのシミュレーションをさらに複雑にします。

    研究 の 目的:

    • 複雑な流体流れをシミュレートするための、新しく実用的なハイブリッドソルバーを開発すること。
    • 精度と計算効率を向上させ、メモリ使用量を削減すること。
    • 流体-固体間相互作用を伴う多相多成分流を効果的に処理すること。

    主な方法:

    • 衝突強化格子ボルツマン法と有限体積法を組み合わせたハイブリッドソルバー。
    • 有限体積法の枠組み内での新しい濡れ境界処理を伴うフェーズフィールドモデリング。
    • 効率的な流体-固体間相互作用処理のための浸入境界法。

    主要な成果:

    • ハイブリッドソルバーは、豊かな界面挙動を伴う多相多成分流を効果的にシミュレートします。
    • 物理的に整合性が取れ、精度の高い結果が検証テストによって確認されました。
    • 従来のメソッドと比較して、メモリ消費量の削減と効率の向上が実証されました。

    結論:

    • 新しいハイブリッドソルバーは、複雑な流体流れシミュレーションのための実用的で優れたソリューションを提供します。
    • この手法は、精度、効率、およびメモリフットプリントの削減を向上させています。
    • 流体-固体間相互作用を含む、多様な流体ダイナミクスシナリオのシミュレーションに適しています。