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.
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.
Read more about Inviscid Flow: Reynolds Number, Problems With The Inviscid-flow Model
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—Henry David Thoreau (1817–1862)