scholarly journals Numerical simulation of boundary layer receptivity to solid particulates near a blunt leading edge

2021 ◽  
Author(s):  
P. V. Chuvakhov ◽  
A. V. Fedorov ◽  
I. O. Pogorelov
Keyword(s):  
Numerical Simulation ◽  
Boundary Layer ◽  
Leading Edge ◽  
Blunt Leading Edge ◽  
Solid Particulates

scholarly journals Cross-correlation measurement of disturbance initiated by weak shock wave in the flat plate boundary layer with blunt leading edge at Mach 2

2021 ◽  
Author(s):  
L. V. Afanasev ◽  
A. D. Kosinov ◽  
A. A. Yatskikh ◽  
V. L. Kocharin ◽  
N. V. Semionov ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Shock Wave ◽  
Flat Plate ◽  
Cross Correlation ◽  
Plate Boundary ◽  
Leading Edge ◽  
Weak Shock ◽  
Weak Shock Wave ◽  
Blunt Leading Edge ◽  
Flat Plate Boundary Layer

Leading-edge effects in bypass transition

2007 ◽  
Vol 572 ◽  
pp. 471-504 ◽  
Author(s):  
S. NAGARAJAN ◽  
S. K. LELE ◽  
J. H. FERZIGER
Keyword(s):  
Boundary Layer ◽  
Leading Edge ◽  
Bypass Transition ◽  
Turbulent Spot ◽  
Eddy Simulation ◽  
Turbulence Transition ◽  
Large Eddy ◽  
Low Speed Streaks ◽  
Vortical Disturbance ◽  
Blunt Leading Edge

The effect of a blunt leading edge on bypass transition is studied by numerical simulation. A mixed direct and large-eddy simulation of a flat plate with a super-ellipse leading edge is carried out at various conditions. Onset and completion of transition is seen to move upstream with increasing bluntness. For sharper leading edges, at lower levels of turbulence, transition usually occurs through instabilities on low-speed streaks as observed by Jacobs & Durbin (2001) and Brandt et al. (2004) whereas increasing either the turbulence intensity or the leading-edge bluntness brings into play another mechanism. Free-stream vortices are amplified at the leading edge because of stretching. In the case of particularly strong vortices, this interaction induces a localized streamwise vortical disturbance in the boundary layer which then grows as it convects downstream and eventually breaks down to form a turbulent spot. These disturbances, which are localized and hence wavepacket-like, move at speeds in the range 0.55 U∞–0.65 U∞ and occur in the lower portion of the boundary layer. Simulations conducted with isolated vortices confirm such a response of the boundary layer.

scholarly journals Hypersonic boundary layer receptivity on flat plate with blunt leading edge due to acoustic disturbance

2021 ◽  
Vol 1786 (1) ◽  
pp. 012037
Author(s):  
Yifeng Zhang ◽  
Jianqiang Chen ◽  
Xianxu Yuan ◽  
Xi Chen ◽  
Xinghao Xiang
Keyword(s):  
Boundary Layer ◽  
Flat Plate ◽  
Leading Edge ◽  
Hypersonic Boundary Layer ◽  
Acoustic Disturbance ◽  
Blunt Leading Edge

Direct Numerical Simulation and Large Eddy Simulation of Laminar Separation Bubbles at Moderate Reynolds Numbers

2014 ◽  
Vol 136 (6) ◽  
Author(s):  
Francois Cadieux ◽  
Julian A. Domaradzki ◽  
Taraneh Sayadi ◽  
Sanjeeb Bose
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Boundary Layer ◽  
Direct Numerical Simulation ◽  
Separation Bubble ◽  
Leading Edge ◽  
Transition To Turbulence ◽  
Laminar Separation Bubble ◽  
Laminar Separation ◽  
Large Eddy

Flows over airfoils and blades in rotating machinery for unmanned and microaerial vehicles, wind turbines, and propellers consist of different flow regimes. A laminar boundary layer near the leading edge is often followed by a laminar separation bubble with a shear layer on top of it that experiences transition to turbulence. The separated turbulent flow then reattaches and evolves downstream from a nonequilibrium turbulent boundary layer to an equilibrium one. Typical Reynolds-averaged Navier–Stokes (RANS) turbulence modeling methods were shown to be inadequate for such laminar separation bubble flows (Spalart and Strelets, 2000, “Mechanisms of Transition and Heat Transfer in a Separation Bubble,” J. Fluid Mech., 403, pp. 329–349). Direct numerical simulation (DNS) is the most reliable but is also the most computationally expensive alternative. This work assesses the capability of large eddy simulations (LES) to reduce the resolution requirements for such flows. Flow over a flat plate with suitable velocity boundary conditions away from the plate to produce a separation bubble is considered. Benchmark DNS data for this configuration are generated with the resolution of 59 × 106 mesh points; also used is a different DNS database with 15 × 106 points (Spalart and Strelets, 2000, “Mechanisms of Transition and Heat Transfer in a Separation Bubble,” J. Fluid Mech., 403, pp. 329–349). Results confirm that accurate LES are possible using O(1%) of the DNS resolution.

INFLUENCE OF THE PLATE LEADING-EDGE SHAPE AND THICKNESS ON THE BOUNDARY LAYER LAMINAR-TURBULENT TRANSITION IN HYPERSONIC FLOW

2019 ◽  
Vol 50 (5) ◽  
pp. 461-481
Author(s):  
Sergei Vasilyevich Aleksandrov ◽  
Evgeniya Andreevna Aleksandrova ◽  
Volf Ya. Borovoy ◽  
Andrey Vyacheslavovich Gubernatenko ◽  
Vladimir Evguenyevich Mosharov ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Hypersonic Flow ◽  
Leading Edge ◽  
Turbulent Transition ◽  
Laminar Turbulent Transition

The Numerical Simulation of Marine Boundary Layer Clouds

1993 ◽  
Author(s):  
Harold D. Orville
Keyword(s):  
Numerical Simulation ◽  
Boundary Layer ◽  
Marine Boundary Layer ◽  
Boundary Layer Clouds
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