Instabilities in the boundary layer over a permeable, compliant wall

2014 ◽  
Vol 26 (8) ◽  
pp. 084103 ◽  
Author(s):  
Franck Pluvinage ◽  
Azeddine Kourta ◽  
Alessandro Bottaro
Keyword(s):  
Boundary Layer ◽  
Compliant Wall

Instabilities in the asymptotic suction boundary layer over a permeable, compliant wall

2015 ◽  
Vol 27 (5) ◽  
pp. 054104 ◽  
Author(s):  
Franck Pluvinage ◽  
Azeddine Kourta ◽  
Alessandro Bottaro
Keyword(s):  
Boundary Layer ◽  
Compliant Wall ◽  
Asymptotic Suction

Experimental Study on the Bursting Phenomenon in the Turbulent Boundary Layer on the Compliant Wall

2008 ◽  
Author(s):  
Yui Owaku ◽  
Isao Misu ◽  
Nobuyoshi Fujimatsu
Keyword(s):  
Boundary Layer ◽  
Drag Reduction ◽  
Solid Wall ◽  
Friction Drag ◽  
Contribution Rate ◽  
Compliant Wall ◽  
Bursting Phenomena ◽  
Four Quadrant ◽  
Friction Drag Reduction ◽  
Ejection Event

This paper describes an experimental study on the friction drag reduction on the compliant wall. In the fluid dynamics, the research on the turbulent friction drag reduction is one of the important subjects. The use of the compliant wall has the possibilities of the friction drag reduction. Many researchers have investigated the effects of the compliant wall since 1960’s. However, the past studies are focused on those effects such as dependency of the material properties and flow conditions. Those effects are intimately related with the turbulent flow fields. In order to clarify the mechanism of the drag reduction, the coherent structures near the wall surface must be investigated. The purpose of the present study is to investigate the vortical semi-periodic motions over the solid and compliant walls in detail. The experiments are conducted at Re = 5.0 × 105 based on unit length and the free stream velocity using the NPL type wind tunnel. The compliant wall is made of silicone resin with Young’s modulus E = 2.83 MPa. The boundary layer flows are measured using the single and X-array hot wire probe. The VITA and four quadrant analyses are applied to investigate the bursting phenomena in the turbulent flow structures. The experimental results show that the skin friction drag over the compliant wall is smaller than that on the solid wall about 15%. Further the bursting frequencies over the compliant wall are greater than those over the solid wall. The four quadrant analysis is also applied to investigate the turbulent coherent motions. These results show that the ejection event over the compliant wall is increased. The contribution rate of the ejection event to the Reynolds stress over the compliant wall is greater than that of the sweep event. The increment of the bursting frequency is consistent with that of the ejection event. The friction drag decreases because the velocity near the wall is decelerated when the contribution rates in second and third quadrants to the Reynolds stress increase. These tendencies are also confirmed over the compliant wall with the various thicknesses. The present results show that the friction drag reduction over the compliant wall is related with the increment of contribution rate of the ejection event in the bursting phenomena.

Stability of Blasius Boundary-Layer Flow Interacting With a Compliant Panel

2014 ◽  
Author(s):  
Konstantinos Tsigklifis ◽  
Anthony D. Lucey
Keyword(s):  
Boundary Layer ◽  
Boundary Layer Flow ◽  
Travelling Wave ◽  
Unstable Flow ◽  
Blasius Boundary Layer ◽  
Compliant Wall ◽  
Plate Spring ◽  
Difference Form ◽  
Tollmien Schlichting ◽  
Layer Flow

We develop a model to study the fluid-structure interaction (FSI) of a compliant panel with a Blasius boundary-layer flow. We carry out a two-dimensional global linear stability analysis modeling the flow using a combination of vortex and source boundary-element sheets on a computational grid while the dynamics of a plate-spring compliant wall are represented in finite-difference form. The system is then couched as an eigenvalue problem and the eigenvalues of the various flow- and wall-based instabilities are analyzed for two distinct sets of system parameters. Key findings are that coalescence — or resonance — of a structural eigenmode with either the most unstable flow-based Tollmien-Schlichting Wave (TSW) or wall-based travelling-wave flutter (TWF) modes can occur. This renders the convective nature of these instabilities to become global for a finite compliant wall, a phenomenon that has not hitherto been reported in the literature.

On the interaction of a compliant wall with a turbulent boundary layer

2020 ◽  
Vol 899 ◽  
Author(s):  
Jin Wang ◽  
Subhra Shankha Koley ◽  
Joseph Katz
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Compliant Wall ◽  
Image Position

Abstract

scholarly journals Erratum: “Instabilities in the boundary layer over a permeable, compliant wall” [Phys. Fluids 26, 084103 (2014)]

2015 ◽  
Vol 27 (12) ◽  
pp. 129901
Author(s):  
Franck Pluvinage ◽  
Azeddine Kourta ◽  
Alessandro Bottaro
Keyword(s):  
Boundary Layer ◽  
Compliant Wall
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