Navier-Stokes Analysis of Wind-Tunnel Interference on Transonic Airfoil Flutter

AIAA Journal ◽  
2002 ◽  
Vol 40 (7) ◽  
pp. 1269-1276 ◽  
Author(s):  
B. M. Castro ◽  
J. A. Ekaterinaris ◽  
M. F. Platzer
Keyword(s):  
Wind Tunnel ◽  
Navier Stokes ◽  
Transonic Airfoil

Navier-Stokes analysis of wind-tunnel interference on transonic airfoil flutter

AIAA Journal ◽  
2002 ◽  
Vol 40 ◽  
pp. 1269-1276
Author(s):  
B. M. Castro ◽  
J. A. Ekaterinaris ◽  
M. F. Platzer
Keyword(s):  
Wind Tunnel ◽  
Navier Stokes ◽  
Transonic Airfoil

The influence of the flow separation bubble and transition location on the profile drag of three 4-digit NACA aerofoil profiles

2021 ◽  
pp. 0309524X2110550
Author(s):  
Moutaz Elgammi ◽  
Tonio Sant ◽  
Atiyah Abdulmajid Ateeah
Keyword(s):  
Wind Tunnel ◽  
Flow Separation ◽  
Separation Bubble ◽  
Reynolds Numbers ◽  
Force Balance ◽  
Navier Stokes ◽  
Separation Mechanism ◽  
Numerical Work ◽  
Low Reynolds Numbers ◽  
Low Reynolds

Modeling of the flow over aerofoil profiles at low Reynolds numbers is difficult due to the complex physics associated with the laminar flow separation mechanism. Two major problems arise in the estimation of profile drag: (1) the drag force at low Reynolds numbers is extremely small to be measured in a wind tunnel by force balance techniques, (2) the profile drag is usually calculated by pressure integration, hence the skin friction component of drag is excluded. In the present work, three different 4-digit NACA aerofoils are investigated. Measurements are conducted in an open-ended subsonic wind tunnel, while numerical work is performed by time Reynolds-averaged Navier Stokes (RANS) coupled with the laminar-kinetic-energy ( K-kl-w) turbulence model. The influence of the flow separation bubbles and transition locations on the profile drag is discussed and addressed. This paper gives important insights into importance of measurements at low Reynolds numbers for better aerodynamic loads predictions.

scholarly journals EXPERIMENTAL, NUMERICAL AND ANALYTICAL INVESTIGATIONS OF WIND-INDUCED NET PRESSURES FOR INDUSTRIAL BUILDINGS WITH ENVELOPE POROSITIES

2016 ◽  
Vol 7 ◽  
pp. 58
Author(s):  
Vanessa Saubke ◽  
Rüdiger Höffer
Keyword(s):  
Spatial Distribution ◽  
Numerical Model ◽  
Wind Tunnel ◽  
External Pressure ◽  
Navier Stokes ◽  
Industrial Building ◽  
Wind Tunnel Experiments ◽  
Industrial Buildings ◽  
External Pressures

The magnitude and the spatial distribution of wind-induced net pressures (external and internal) on buildings are frequently discussed among research communities and construction industries. This paper deals with this topic based on a case study about an industrial building in Denmark, which was damaged due to the wind impact during a storm when a large part of the roof covering was blown off. In order to detect the reason for the damage the wind-induced loads were studied by i) wind tunnel experiments on the external pressures due to different wind directions, ii) analytical investigations of internal pressure due to envelope porosities and planned openings and iii) numerical analyses for the internal and the external pressure. The Reynolds averaged Navier-Stokes (RANS) method is employed to build a numerical model. The experimental, analytical and numerical results are compared with the indicated characteristic loads from the Eurocode.

Transonic airfoil design procedure utilizing a Navier-Stokes analysis code

AIAA Journal ◽  
1987 ◽  
Vol 25 (3) ◽  
pp. 353-359 ◽  
Author(s):  
Naoki Hirose ◽  
Susumu Takanashi ◽  
Nobuhiro Kawai
Keyword(s):  
Design Procedure ◽  
Navier Stokes ◽  
Transonic Airfoil ◽  
Transonic Airfoil Design
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