Effects of free-stream turbulence intensity on transition in a laminar separation bubble formed over an airfoil
Sign Up to like & getrecommendations! Published in 2018 at "Experiments in Fluids"
DOI: 10.1007/s00348-018-2511-6
Abstract: The laminar-to-turbulent transition process in a laminar separation bubble formed over a NACA 0018 airfoil is investigated experimentally. All experiments are performed for an angle of attack of 4$$^{\circ }$$∘, chord Reynolds numbers of 80,000… read more here.
Keywords: separation bubble; free stream; turbulence; turbulence intensity ... See more keywords
Analysis of the expanding process of turbulent separation bubble on an iced airfoil under stall conditions
Sign Up to like & getrecommendations! Published in 2021 at "Aerospace Science and Technology"
DOI: 10.1016/j.ast.2021.106755
Abstract: Abstract The expanding process of turbulent separation bubble induced by a horn ice on the leading edge of an airfoil for business jet was investigated numerically with IDDES. Through comparing with the experiment results of… read more here.
Keywords: process turbulent; separation bubble; separation; process ... See more keywords
Spanwise flow development within a laminar separation bubble under natural and forced transition
Sign Up to like & getrecommendations! Published in 2018 at "Experimental Thermal and Fluid Science"
DOI: 10.1016/j.expthermflusci.2018.02.032
Abstract: Abstract The variation of streamwise and spanwise characteristic wavelengths of a NACA 0018 laminar separation bubble under natural and periodic excitation conditions is investigated experimentally. Periodic forcing is applied with an AC-DBD plasma actuator, and… read more here.
Keywords: separation bubble; bubble natural; excitation; spanwise ... See more keywords
Interaction between separation bubble and impinging vortices over a finite blunt plate
Sign Up to like & getrecommendations! Published in 2020 at "International Journal of Heat and Fluid Flow"
DOI: 10.1016/j.ijheatfluidflow.2020.108534
Abstract: Abstract In this work, the interactive process between separation bubble and impinging leading-edge vortices, which is superimposed in unsteady separated and reattaching flows over a finite blunt plate, was experimentally determined. We used an effective… read more here.
Keywords: separation bubble; bubble impinging; process; separation ... See more keywords
Numerical and experimental studies on the aerodynamics of a 5:1 rectangular cylinder at angles of attack
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Wind Engineering and Industrial Aerodynamics"
DOI: 10.1016/j.jweia.2020.104097
Abstract: Abstract The aerodynamic behavior of a 5:1 rectangular cylinder at angles of attack (AoA) up to 15° is investigated based on Three-dimensional Large-Eddy Simulations (3D LES) and instantaneous pressure measurements. The numerical results indicate that… read more here.
Keywords: rectangular cylinder; separation bubble; angles attack; cylinder angles ... See more keywords
Response of a laminar separation bubble to impulsive forcing
Sign Up to like & getrecommendations! Published in 2017 at "Journal of Fluid Mechanics"
DOI: 10.1017/jfm.2017.217
Abstract: The spatial and temporal response characteristics of a laminar separation bubble to impulsive forcing are investigated by means of time-resolved particle image velocimetry and linear stability theory. A two-dimensional impulsive disturbance is introduced with an… read more here.
Keywords: bubble impulsive; impulsive forcing; separation bubble; separation ... See more keywords
Laminar separation bubble formation and bursting on a finite wing
Sign Up to like & getrecommendations! Published in 2024 at "Journal of Fluid Mechanics"
DOI: 10.1017/jfm.2024.321
Abstract: Abstract The transient processes of laminar separation bubble (LSB) formation and bursting on a rectangular NACA 0018 wing are studied experimentally. A two-dimensional airfoil model is used as a baseline for the assessment of finite… read more here.
Keywords: laminar separation; separation bubble; lift; bubble formation ... See more keywords
On the three-dimensional structure of instabilities beneath shallow-shoaling internal waves
Sign Up to like & getrecommendations! Published in 2024 at "Journal of Fluid Mechanics"
DOI: 10.1017/jfm.2024.703
Abstract: Abstract The stimulation of instability and transport in the bottom boundary layer by internal solitary waves has been documented for over twenty years. However, the challenge of shallow slopes and a disparity of scales between… read more here.
Keywords: separation bubble; dimensional structure; three dimensionalisation; boundary layer ... See more keywords
Laminar separation bubble analysis by means of single–shot lifetime temperature sensitive paint in a water towing tank
Sign Up to like & getrecommendations! Published in 2024 at "Measurement Science and Technology"
DOI: 10.1088/1361-6501/ad3a85
Abstract: A laminar separation bubble is studied on an SD7003 foil in a water towing tank at a Reynolds number of 6⋅104 and an angle of attack of 6∘ by means of the temperature sensitive paint… read more here.
Keywords: laminar separation; single shot; separation bubble; shot lifetime ... See more keywords
Physics-based distinction of nonequilibrium effects in near-wall modeling of turbulent separation bubble with and without sweep
Sign Up to like & getrecommendations! Published in 2024 at "Physical Review Fluids"
DOI: 10.1103/gfr7-6l2m
Abstract: Pressure-gradient-induced separation of swept and unswept turbulent boundary layers, based on the DNS studies of Coleman et al. (J. Fluid Mech. 2018&2019), have been analyzed for various nonequilibrium effects. The goal is to isolate physical… read more here.
Keywords: separation bubble; decomposition; near wall; wall ... See more keywords
Suction control of laminar separation bubble over an airfoil at low Reynolds number
Sign Up to like & getrecommendations! Published in 2019 at "Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering"
DOI: 10.1177/0954410017727025
Abstract: A laminar separation bubble appears generally on the NACA2415 airfoil at low Reynolds number. In this paper, suction control of the laminar separation bubble over the NACA2415 airfoil at low Reynolds number are simulated. The… read more here.
Keywords: suction; suction control; separation bubble; laminar separation ... See more keywords