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An inviscid flow is the flow of an ideal fluid that is assumed to have no viscosity. In fluid dynamics there are problems that are easily solved by using the simplifying assumption of an inviscid flow.〔Clancy, L.J., ''Aerodynamics'', p.xviii〕 The flow of fluids with low values of viscosity agree closely with inviscid flow everywhere except close to the fluid boundary where the boundary layer plays a significant role.〔Kundu, P.K., Cohen, I.M., & Hu, H.H., ''Fluid Mechanics'', Chapter 10, sub-chapter 1〕 ==Reynolds number== The assumption of inviscid flow is generally valid where viscous forces are small in comparison to the inertial forces. Such flow situations can be identified as flows with a Reynolds number much greater than one. The assumption that viscous forces are negligible can be used to simplify the Navier-Stokes solution to the Euler equations. The Euler equation governing inviscid flow is: : which is admittedly Newton's second law applied on a flowing infinitesimal volume element. In the steady-state case, combined with the continuity equation of mass, this can be solved using potential flow theory. 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「inviscid flow」の詳細全文を読む スポンサード リンク
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