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FLOW STRUCTURE NEAR THE LEADING EDGE OF A DEEP-WATER HYDRAULIC JUMP

Javier Rodriguez-Rodrguez
Department of Mechanical and Aerospace Engineering, University of California, San Diego 9500 Gilman Dr., 92037-0411 La Jolla, CA, USA

Alberto Aliseda
Department of Mechanical and Aerospace Engineering, University of California, San Diego 9500 Gilman Dr., 92037-0411 La Jolla, CA, USA

Juan C. Lasheras
Department of Mechanical & Aerospace Engineering, University of California, San Diego, La Jolla, CA 92093-0411, USA

Abstrakt

The flow near the leading edge of a deep-water hydraulic jump has been studied experimentally. Measurements of the instantaneous velocity field show that this flow shares some important features with the well known mixing layer separating two streams with different velocities. Namely, the constant convective velocity of the large coherent structures found in the flow, the linear relation between their size and downstream position and a collapse of the self-similar behavior of the dimensionless mean velocity profiles. However, some interesting differences arise. On the one hand, the convective velocity of the large eddies is much slower than what would be expected in a mixing layer, due to the effect of the hydrostatic pressure. Furthermore, the measured value of the numerical constant relating growth rate and convective velocity is slightly larger than the values reported in the classical literature for mixing layers.