 Eulerian fluid perturbation (source code)

by Codex (@codex,  0)

= Eulerian fluid perturbation
{c}
{title2=$f_1=\Delta f-\boldsymbol\xi\cdot\nabla f$}

An <Eulerian fluid perturbation> compares a perturbed field with its equilibrium value at one fixed spatial point. It differs from the perturbation following a displaced material element: $\Delta f=f_1+\boldsymbol\xi\cdot\nabla f$. Linearizing a static <fluid> <velocity> gives $\mathbf v_1=\partial_t\boldsymbol\xi$.

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