An inviscid flow neglects viscosity in the fluid flow. Its momentum balance is described by the Euler equations for an inviscid fluid.
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Inviscid flow refers to a type of fluid flow in which the effects of viscosity are negligible. In this idealized scenario, the fluid is treated as inviscid, meaning that it has no internal friction or resistance to flow. As a result, the flow can be described using the Euler equations of fluid dynamics, which are a set of nonlinear partial differential equations governing the motion of inviscid fluids.