Abstract
We investigate flow separation in the air flow over transverse sand
dunes. Numerical simulations of the air flow over differently shaped
dunes are performed. The length of the recirculation region after the
brink of the dune is found to depend strongly on the shape of the dune.
A phenomenological expression for the separation length is presented.
Suitably non-dimensionalized, it depends linearly on the angle of the
dune at the slip face brink. We propose that the shape of the separating
streamline is well approximated by an ellipse. (c) 2006 Elsevier B.V.
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