scholarly journals Nonlinear input/output analysis: application to boundary layer transition

2021 ◽  
Vol 911 ◽  
Author(s):  
Georgios Rigas ◽  
Denis Sipp ◽  
Tim Colonius
Keyword(s):  
Boundary Layer ◽  
Boundary Layer Transition ◽  
Input Output ◽  
Output Analysis ◽  
Layer Transition ◽  
Input Output Analysis ◽  
Nonlinear Input ◽  
Analysis Application

Abstract

scholarly journals Reattachment streaks in hypersonic compression ramp flow: an input–output analysis

2019 ◽  
Vol 880 ◽  
pp. 113-135 ◽  
Author(s):  
Anubhav Dwivedi ◽  
G. S. Sidharth ◽  
Joseph W. Nichols ◽  
Graham V. Candler ◽  
Mihailo R. Jovanović
Keyword(s):  
Boundary Layer ◽  
Streamwise Velocity ◽  
Base Flow ◽  
Transition To Turbulence ◽  
Streamwise Vorticity ◽  
Input Output ◽  
Output Analysis ◽  
Input Output Analysis ◽  
Boundary Layer Interaction ◽  
Compression Ramp

We employ global input–output analysis to quantify amplification of exogenous disturbances in compressible boundary layer flows. Using the spatial structure of the dominant response to time-periodic inputs, we explain the origin of steady reattachment streaks in a hypersonic flow over a compression ramp. Our analysis of the laminar shock–boundary layer interaction reveals that the streaks arise from a preferential amplification of upstream counter-rotating vortical perturbations with a specific spanwise wavelength. These streaks are associated with heat-flux striations at the wall near flow reattachment and they can trigger transition to turbulence. The streak wavelength predicted by our analysis compares favourably with observations from two different hypersonic compression ramp experiments. Furthermore, our analysis of inviscid transport equations demonstrates that base-flow deceleration contributes to the amplification of streamwise velocity and that the baroclinic effects are responsible for the production of streamwise vorticity. Finally, the appearance of the temperature streaks near reattachment is triggered by the growth of streamwise velocity and streamwise vorticity perturbations as well as by the amplification of upstream temperature perturbations by the reattachment shock.

Input-Output Analysis of Shock Boundary Layer Interaction

2018 ◽  
Author(s):  
Anubhav Dwivedi ◽  
Sidharth Gs ◽  
Graham V. Candler ◽  
Joseph W. Nichols ◽  
Mihailo Jovanovic
Keyword(s):  
Boundary Layer ◽  
Input Output ◽  
Output Analysis ◽  
Layer Interaction ◽  
Input Output Analysis ◽  
Shock Boundary Layer Interaction ◽  
Boundary Layer Interaction

EXPERIMENTAL AND NUMERICAL INVESTIGATIONS OF BOUNDARY LAYER TRANSITION ON BLUNTED CONES AT SUPERSONIC FLOW

2010 ◽  
Vol 40 (3) ◽  
pp. 309-319 ◽  
Author(s):  
V. N. Brazhko ◽  
A. V. Vaganov ◽  
N. A. Kovaleva ◽  
N. P. Kolina ◽  
I. I. Lipatov
Keyword(s):  
Boundary Layer ◽  
Supersonic Flow ◽  
Boundary Layer Transition ◽  
Layer Transition ◽  
Numerical Investigations

Automatic control of laminar boundary-layer transition

AIAA Journal ◽  
1997 ◽  
Vol 35 ◽  
pp. 85-90
Author(s):  
P. A. Nelson ◽  
M. C. M. Wright ◽  
J.-L. Rioual
Keyword(s):  
Boundary Layer ◽  
Automatic Control ◽  
Laminar Boundary Layer ◽  
Boundary Layer Transition ◽  
Layer Transition
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