When you are asked to simulate the flow of gas in some corner of the universe, the first thing you need is a system of equations that govern the same. But let’s just say you have found yourself a closed, well posed system of equations, what next? The next choice one has to make is the method by which to solve the found system of equations. There are two broad classes to the same: Eulerian and Lagrangian. With an Eulerian approach, you divide the region of space into smaller regions, a grid, and simulate transport over the grid over time, giving you snapshots of how the grid looks at a…
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