Concept

D'Alembert–Euler condition

Summary
In mathematics and physics, especially the study of mechanics and fluid dynamics, the d'Alembert-Euler condition is a requirement that the streaklines of a flow are irrotational. Let x = x(X,t) be the coordinates of the point x into which X is carried at time t by a (fluid) flow. Let \ddot{\mathbf{x}}=\frac{D^2\mathbf{x}}{Dt} be the second material derivative of x. Then the d'Alembert-Euler condition is: :\mathrm{curl}\ \mathbf{x}=\mathbf{0}. , The d'Alembert-Euler condition is named for Jean le Rond d'Alembert and Leonhard Euler who independently first described its use in the mid-18th century. It is not to be confused with the Cauchy–Riemann conditions.
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