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関連する概念動画

General External Flow Characteristics01:26

General External Flow Characteristics

270
The study of external flow is essential for creating structures and objects that interact efficiently and safely with moving fluids, such as air or water. When a body is immersed in a flowing fluid, it experiences two primary forces: drag, which opposes motion along the flow direction, and lift, which acts perpendicular to the flow. The shape, size, and orientation of the object influence these forces.Streamlined and Blunt Bodies in External FlowObjects in fluid flow are classified as...
270
Plane Potential Flows01:23

Plane Potential Flows

452
Plane potential flows simplify fluid motion by assuming the fluid to be irrotational and incompressible. These characteristics allow these flows to be described by a velocity potential function, ϕ, representing the flow speed in a given direction, and a stream function, ψ, that visualizes the flow path, both governed by Laplace's equation. These parameters help in estimating flow patterns, velocity distributions, and pressure fields around various hydraulic structures.
Uniform...
452
Irrotational Flow01:28

Irrotational Flow

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Irrotational flow is characterized by fluid motion where particles do not rotate around their axes, resulting in zero vorticity. For a flow to be irrotational, the curl of the velocity field must be zero. This imposes specific conditions on velocity gradients. For instance, to maintain zero rotation about the z-axis, the gradient condition:
551
Absolute Motion Analysis- General Plane Motion01:24

Absolute Motion Analysis- General Plane Motion

271
Visualize a drone, with its propellers spinning rapidly, hovering mid-air. The fascinating movements and operations of this drone can be comprehended by applying the principle of general plane motion.
As the drone's propellers rotate, an upward force is generated that counteracts the force of gravity, enabling the drone to lift off from the ground. This initial movement of the drone is along a straight path, representing a form of translational motion. In this phase, every point on the...
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Lift01:23

Lift

240
Lift is a fundamental aerodynamic force that acts perpendicular to the direction of airflow. It plays a central role in achieving and sustaining flight and in stabilizing various vehicles. Lift primarily originates from pressure differences created across surfaces, such as an airfoil. A lower pressure region forms above the wing, while a higher pressure region forms below it, generating an upward force. This differential results from the shape and orientation of the airfoil, enabling the wing...
240
Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

328
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
328

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Noninvasive Determination of Vortex Formation Time Using Transesophageal Echocardiography During Cardiac Surgery
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ユニバーサル・ヴォルテックス形成の飛行時間

Yukun Sun1, Emily Palmer2, Christopher Dougherty1

  • 1Department of Biological and Environmental Engineering, Cornell University, Ithaca, NY 14853.

Proceedings of the National Academy of Sciences of the United States of America
|August 29, 2025
PubMed
まとめ
この要約は機械生成です。

新しいスケーリング法則である 一般的な渦の形成時間は 種と条件の間の 生物学的飛行を説明します この原理は最先端の渦の循環を最大化することで 動物の動きを理解するための 普遍的な枠組みを提供します

キーワード:
バイオコモーションフラップフライト先端の渦渦の形成

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Experimental Investigation of the Flow Structure over a Delta Wing Via Flow Visualization Methods
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科学分野:

  • エロダイナミクス
  • バイオメカニクス
  • 流体力学

背景:

  • 生物学的フライヤーは 付属体の振動で推進力を生み出し 飛行運動はスケーリング法則で研究されている.
  • ストルーハル数 (St) は巡航飛行の一般的なメトリックですが,条件に依存しています.
  • リードエッジ渦 (LEV) は,羽ばたき飛行における推進力の生成に不可欠です.

研究 の 目的:

  • 特殊な飛行条件にかかわらず,生物学的飛行のための普遍的なスケーリング法を開発する.
  • 渦の形成時間の概念を一般化する.
  • 生物学的な動きを理解するための 統一的な枠組みを提供すること

主な方法:

  • LEV循環の最大化に基づいた一般的な渦形成時間を開発した.
  • 渦巻き性の増加と最大許容される渦巻き性で渦巻き性の投与期間をスケールしました.
  • 新しいスケール法と ストルーハルの数字を 28種の飛行データと 比較しました

主要な成果:

  • 一般的な渦の形成時間は,様々なフライヤーと巡航歩行において一貫しています.
  • この新しいメトリックは,ストルーハル数とは異なり,特定の飛行条件とは無関係です.
  • フライトダイナミクスを分析するための統一的な枠組みを示した.

結論:

  • 一般的な渦形成時間は 生物学的飛行を理解するための 基本的な原理を提供します
  • この発見は自然界における 複雑な翼運動学の研究を進めています
  • バイオモーション分析の普遍的なアプローチを強調しています.