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Effects of oscillation frequency and amplitude on separation in an unsteady turbulent flow by Martin Fox

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Written in English

• Aeronautics

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Edition Notes

The Physical Object ID Numbers Contributions Naval Postgraduate School (U.S.) Pagination 1 v. : Open Library OL25411406M

Abstract. Allusions and conjectures about the influence of imposed oscillations on the bursting mechanism in wall flows are not uncommon in the litterature on unsteady turbulent boundary layers or Cited by: 3.   For example, in unsteady flows, we can consider the solution to reach a periodic state when the amplitude of oscillation doesn't change anymore. But when the curve is not sinusoidal, I don't know how to measure the amplitude, and as a result I don't know how should I understand that the solution is reached to a periodic state! Without any damping, the cylinder would oscillate at $\sqrt{ \tfrac{g}{\Delta x} }$ indefinitely but the damping here will alter the maximum $\Delta x$ of each subsequent oscillation. So the amplitude and frequency of oscillations will change in time, i.e., the amplitude will . The objective of this study is to investigate the effects of oscillations in the main flow and the coolant jets on film cooling at various frequencies (0 to Hz) at low and high average blowing ratios. Numerical simulations are performed using LES Smagorinsky–Lilly turbulence model for calculation of the adiabatic film cooling effectiveness and using the DES Realizable k-epsilon Cited by: 1.