Lagrangian averaging with geodesic mean.
نویسنده
چکیده
This paper revisits the derivation of the Lagrangian averaged Euler (LAE), or Euler-α equations in the light of an intrinsic definition of the averaged flow map as the geodesic mean on the volume-preserving diffeomorphism group. Under the additional assumption that first-order fluctuations are statistically isotropic and transported by the mean flow as a vector field, averaging of the kinetic energy Lagrangian of an ideal fluid yields the LAE Lagrangian. The derivation presented here assumes a Euclidean spatial domain without boundaries.
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ورودعنوان ژورنال:
- Proceedings. Mathematical, physical, and engineering sciences
دوره 473 2207 شماره
صفحات -
تاریخ انتشار 2017