👉 Pinnet is a type of mathematical object in the field of fluid mechanics, specifically used to represent the flow of fluids. It is an annulus (a hollow cylinder) with a circular hole at its center. The pinnet is characterized by two holes on its outer surface and four holes on its inner surface. In fluid dynamics, pinnets are often used to model the flow around a circular cylinder or a pipe. They can be used to simulate the flow of liquids and gases through pipes, as
