ComputationalFluidDynamicist''''s model fluid flow numerically.

Typically these folks carve out a domain of interest, e.g., a region around a numerical model of an aircraft, divide the domain into as many little compartments as they have computer power to spare, and solve a set of WhatComesInMustGoOutEquations in every compartment until all the compartments agree.
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CategoryMath, ReynoldsTransportTheorem