FPE Fluid Dynamics Review Seminar: Andrew Trettel, University of Maryland

Friday, March 27, 2015
11:00 a.m.
DeWalt Seminar Room, 2164 Martin Hall

THE BURGERS PROGRAM for FLUID DYNAMICS
FLUID DYNAMICS REVIEWS SEMINAR SERIES

Speaker: Andrew Trettel, University of Maryland

VELOCITY TRANSFORMATION FOR COMPRESSIBLE WALL TURBULENCE WITH HEAT TRANSFER

Abstract: In low speed and incompressible turbulent flows, the law of the wall scaling collapses velocity profiles onto the same curve. In these low speed flows, the temperature is constant, but in high speed and compressible flows, the temperature is spatially non-uniform due to viscous heating, creating large changes in density and viscosity throughout the boundary layer, and adjusting the velocities such that they no longer converge onto the law of the wall scaling. The Van Driest transformation can transform these compressible high speed velocities into equivalent incompressible low speed velocities that do collapse onto the law of the wall in adiabatic (thermally-insulated) cases only. Here, the speaker proposes a new transformation to collapse compressible high speed velocities onto the incompressible law of the wall even in non-adiabatic scenarios, and tests this transformation on direct numerical simulations of turbulent channel flows and on experimental data of turbulent boundary layers.

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