Laminar to Turbulent Transition at Unsteady Inflow Conditions: Direct Numerical Simulations with Small Scale Free-Stream Turbulence

2019 ◽  
pp. 214-224 ◽  
Author(s):  
Duncan Ohno ◽  
Jonas Romblad ◽  
Ulrich Rist
Keyword(s):  
Numerical Simulations ◽  
Free Stream ◽  
Direct Numerical Simulations ◽  
Small Scale ◽  
Scale Free ◽  
Free Stream Turbulence ◽  
Laminar To Turbulent Transition ◽  
Turbulent Transition ◽  
Unsteady Inflow ◽  
Inflow Conditions

ESTIMATION OF THE EFFECT OF FREE-STREAM TURBULENCE AND SOLID PARTICLES ON THE LAMINAR-TURBULENT TRANSITION AT HYPERSONIC SPEEDS

2016 ◽  
Vol 47 (1) ◽  
pp. 15-28 ◽  
Author(s):  
Mikhail Aleksandrovich Pugach ◽  
Alexander Aleksandrovich Ryzhov ◽  
Alexander Vitalievich Fedorov
Keyword(s):  
Free Stream ◽  
Solid Particles ◽  
Free Stream Turbulence ◽  
Turbulent Transition ◽  
Hypersonic Speeds ◽  
Laminar Turbulent Transition

Laminar—turbulent transition at high free-stream turbulence level

2002 ◽  
pp. 131-165
Author(s):  
Andrey V. Boiko ◽  
Genrih R. Grek ◽  
Alexander V. Dovgal ◽  
Victor V. Kozlov
Keyword(s):  
Free Stream ◽  
Turbulence Level ◽  
Free Stream Turbulence ◽  
Turbulent Transition ◽  
Laminar Turbulent Transition

Some Effects of Upstream Turbulence on the Unsteady Lift Forces Imposed on Prismatic Two Dimensional Bodies

1984 ◽  
Vol 106 (4) ◽  
pp. 418-424 ◽  
Author(s):  
I. S. Gartshore
Keyword(s):  
Small Scale ◽  
Resonant Amplitude ◽  
Scale Free ◽  
Free Stream Turbulence ◽  
Subsequent Decrease ◽  
Scale Turbulence ◽  
Oncoming Stream ◽  
Rms Amplitude ◽  
Stream Direction ◽  
Unsteady Lift

Measurements of fluctuating lift are reported from four fixed rectangular prisms and a fixed circular cylinder, for various intensities of turbulence in the oncoming stream. Variations of unsteady lift with intensity of small scale turbulence are similar to present (and previous) measured variations of mean drag or base pressure. Reasons are suggested for these trends. Observations are also reported of the maximum (resonant) RMS amplitude of two cylinders, one square and the other circular in cross section, free to move in the cross stream direction. Small scale free stream turbulence provided by the wake of a small upstream rod increased the resonant amplitude of motion in both cases, the greater increase (and subsequent decrease) occurring for the square section. Two possible explanations for these observations are advanced.

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