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Potential Flow Theory - MIT

Hydrodynamics Reading #4. Hydrodynamics Prof. Techet Potential Flow Theory When a flow is both frictionless and irrotational, pleasant things happen. White, Fluid Mechanics 4th ed. We can treat external flows around bodies as invicid ( frictionless) and irrotational ( the fluid particles are not rotating). This is because the viscous effects are limited to a thin layer next to the body called the boundary layer. In graduate classes like , you'll learn how to solve for the invicid flow and then correct this within the boundary layer by considering viscosity. For now, let's just learn how to solve for the invicid flow. We can define a Potential function, ! ( x, z, t ) , as a continuous function that satisfies the basic laws of fluid mechanics: conservation of mass and momentum, assuming incompressible, inviscid and irrotational flow.

Laplace Equation The velocity must still satisfy the conservation of mass equation. We can substitute in the relationship between potential and velocity and arrive at the Laplace Equation, which we will revisit in our discussion on linear waves. ... Spherical Coordinates (r, ...

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