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Drag crisis
In fluid dynamics, drag crisis is a phenomenon in which drag coefficient drops off suddenly as Reynolds number increases. This has been well studied for round bodies like spheres and cylinders. The drag coefficient of a sphere will change rapidly from about 0.5 to 0.2 at a Reynolds number in the range of 300000. This corresponds to the point where the flow pattern changes, leaving a narrower turbulent wake. The behaviour is highly dependent on small differences in the condition of the surface of the sphere. ==External links==
* (【引用サイトリンク】title= Simulating Drag Crisis for a Sphere Using Skin Friction Boundary Conditions ) * (【引用サイトリンク】title= Flow past a cylinder: Shear layer instability and drag crisis )
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Drag crisis」の詳細全文を読む
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