: Astronomy: fluid flow

classical mechanics aspects > continuum mechanics > fluid mechanics > fluid dynamics > fluid flow

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fluid flow

A fluid flow (both liquid and air) may be described in two different ways : the Lagrangian approach (named after the French mathematician Joseph Louis Lagrange), and the Eulerian approach (named after Leonhard Euler, a famous Swiss mathematician). In the Lagrangian approach, one particle is chosen and is followed as it moves through space with time. The line traced out by that one particle is called a particle pathline. An example is a transmitting ocean buoy that observes a set path over regular intervals over a period of time. The path observed is the particle pathline. A Eulerian approach is used to obtain a clearer idea of the airflow at one particular instant. One can look at a "photograph" of the flow of, for instance, surface ocean currents at a particular fixed time. The entire flow field is easily visualized. The lines comprising this flow field are called streamlines . (Encyclopedia of Science, by David Darling, https://www.daviddarling.info/encyclopedia/F/fluid_flow.html)

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