Concept explainers
Streaklines are traced out by neutrally buoyant marker fluid injected into a flow field from a fixed point in space. A particle of the marker fluid that is at point (x, y) at time t must have passed through the injection point (x0, y0) at some earlier instant t = τ. The time history of a marker particle may be found by solving the pathline equations for the initial conditions that x = x0, y = y0 when t = τ. The present locations of particles on the streakline are obtained by setting τ equal to values in the range 0 ≤ τ ≤ t. Consider the flow field
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Fox and McDonald's Introduction to Fluid Mechanics
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