Effect of Shape of Two-Dimensional Smooth Hump on Boundary Layer Instability

Park, Donghun; Oh, Se-Joon

doi:10.1007/s42405-020-00268-5

Cited by 7 publications

(3 citation statements)

References 51 publications

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“…However, Park and Park attributed this deviation to a difference in hump shape with the results from Wörner et al [8]. More recently, Park and Oh [9] investigated the effect of hump shape on the stability of two-dimensional boundary layers showing a destabilization of the incoming modes for all cases.…”

Section: Introductionmentioning

confidence: 92%

Linear and Nonlinear Stability Analysis of a Three-Dimensional Boundary Layer over a Hump

Westerbeek

Sumariva

Michelis

et al. 2023

AIAA SCITECH 2023 Forum

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The Parabolized Stability Equations (PSE), Adaptive Harmonic Linearized Navier-Stokes (AHLNS) and Harmonic Navier-Stokes (HNS) solvers are used to analyze the linear and nonlinear stability of swept-wing boundary layers under the influence of smooth wall deformations of varying size and geometry. Special attention is given to the validity of the slowly varying flow assumption of PSE via a comparison with AHLNS and HNS results. The surface deformations analyzed in this work are found to affect the development of the primary stationary crossflow instability mode as well as higher harmonics. Analysis of the locally most amplified mode reveals successive modulation of the growth rate in the vicinity of the surface deformation. This process was found to be largely governed by linear terms and driven by the base flow modification due to the deformed wall. Similarly, the base flow modification causes higher harmonics to experience a significant destabilization. This is followed by stabilization as nonlinear interactions become dominant. The PSE methodology proved capable of predicting the stability response for small wall deformations with only minor amplitude discrepancies compared to HNS results. The main difference was found to occur in the wall-normal velocity profiles of the mean flow distortion mode. The deviations of the PSE results compared to harmonic stability methods increased as the protuberance was made steeper. Moreover, the PSE framework was not able to converge for all cases nonlinearly.

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Section: Introductionmentioning

confidence: 92%

Linear and Nonlinear Stability Analysis of a Three-Dimensional Boundary Layer over a Hump

Westerbeek

Sumariva

Michelis

et al. 2023

AIAA SCITECH 2023 Forum

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“…The geometry of surface roughness can be divided into two classes: isolated roughness (Nayfeh and Ragab,1988;Xu et al, 2016;Park and Oh, 2020) and distributed roughness (Lessen and Gangwani, 1976;Corke et al, 1986;Floyan, 2005;Asai and Floyan, 2006;Ma'mun et al, 2014Ma'mun et al, , 2015Tameike et al, 2021). When the height of roughness is large, e.g., on the order of the boundary layer thickness, an isolated roughness or each component of a distributed roughness can trigger a boundary-layer transition through strong inflectional instability directly where the growth stage of the instability waves is bypassed (Doenhoff and Braslow, 1961).…”

Section: Introductionmentioning

confidence: 99%

Direct numerical simulation of the stability of zero-pressure-gradient boundary layer over corrugated wall using the immersed interface method

UNNO

Inasawa

2023

JFST

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“…AHLNS removes some of the inherent limitations present in LST and PSE, and it has been already applied effectively in the presence of humps by Franco et al [2]. Edelmann et al [3] used LST with forwardfacing steps introducing a special treatment for the region around the step and Park et al [4] performed PSE analyses for smooth humps. To the best of the authors' knowledge, there is no published comparison between LST, PSE, AHLNS, and DNS for the development of TS waves encountering surface irregularities.…”

mentioning

confidence: 99%

The Effect of 2-D Surface Irregularities on Laminar-Turbulent Transition: A Comparison of Numerical Methodologies

Tocci

Franco

Hein

et al. 2021

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

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Laminar-turbulent transition prediction is of practical interest in aircraft design since transition affects important aerodynamic quantities such as drag and heat transfer. Extended laminar flow on aerodynamic surfaces is an effective way of reducing aircraft drag. One of the major challenges for the implementation of laminar-flow surfaces is the potential for any irregularity to move transition upstream. Under low-disturbance environment, boundary-layer transition results from the growth and breakdown of different flow instabilities. In 2-D flows the scenario is dominated by Tollmien-Schlichting (TS) instabilities. Common wing-surface irregularities, such as two-dimensional steps, gaps or waviness can alter the growth characteristics of TS waves and therefore must be taken into account at the design stage.

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Effect of Shape of Two-Dimensional Smooth Hump on Boundary Layer Instability

Cited by 7 publications

References 51 publications

Linear and Nonlinear Stability Analysis of a Three-Dimensional Boundary Layer over a Hump

Linear and Nonlinear Stability Analysis of a Three-Dimensional Boundary Layer over a Hump

Direct numerical simulation of the stability of zero-pressure-gradient boundary layer over corrugated wall using the immersed interface method

The Effect of 2-D Surface Irregularities on Laminar-Turbulent Transition: A Comparison of Numerical Methodologies

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