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All Outputs (37)

Mechanisms of airfoil noise near stall conditions (2019)
Journal Article
Lacagnina, G., Chaitanya, P., Berk, T., Kim, J., Joseph, P., Ganapathisubramani, B., …Pinelli, A. (2019). Mechanisms of airfoil noise near stall conditions. Physical Review Fluids, 4(12), Article 123902. https://doi.org/10.1103/physrevfluids.4.123902

The focus of this paper is on investigating the noise produced by an airfoil at high angles of attack over a range of Reynolds number Re≈2×105–4×105. The objective is not modeling this source of noise but rather understanding the mechanisms of genera... Read More about Mechanisms of airfoil noise near stall conditions.

Energy saving strategy for the development of icephobic coatings and surfaces (2019)
Journal Article
Zheng, Y., Wang, J., Liu, J., Choi, K., & Hou, X. (2019). Energy saving strategy for the development of icephobic coatings and surfaces. Thin Solid Films, 687, Article 137458. https://doi.org/10.1016/j.tsf.2019.137458

Aircraft are frequently exposed to cold environments and ice accumulation on aircraft surface may lead to catastrophic accidents. An effective solution of ice protection is a critical requirement in the aerospace industry. For the research and develo... Read More about Energy saving strategy for the development of icephobic coatings and surfaces.

In-situ icing and water condensation study on different topographical surfaces (2019)
Journal Article
Memon, H., Liu, J., Weston, N., Wang, J., De Focatiis, D., Choi, K., & Hou, X. (2019). In-situ icing and water condensation study on different topographical surfaces. Cold Regions Science and Technology, 165, Article 102814. https://doi.org/10.1016/j.coldregions.2019.102814

Icephobicity is intrinsically affected by rough asperities and the surface voids provide anchoring points for the ice. The anchor of ice is likely to form on the surface under high humidity conditions. In-situ water condensation and icing observation... Read More about In-situ icing and water condensation study on different topographical surfaces.

Flow control over a circular cylinder using virtual moving surface boundary-layer control (2019)
Journal Article
Zhang, X., Choi, K., Huang, Y., & Li, H. (2019). Flow control over a circular cylinder using virtual moving surface boundary-layer control. Experiments in Fluids, 60(6), https://doi.org/10.1007/s00348-019-2745-y

Flow control study of a circular cylinder is carried out using symmetric dielectric barrier discharge (DBD) plasma actuators at the Reynolds number of 10,000. Here, two symmetric DBD plasma actuators are located at the top and bottom of the circular... Read More about Flow control over a circular cylinder using virtual moving surface boundary-layer control.

Hydrophobic/icephobic coatings based on thermal sprayed metallic layers with subsequent surface functionalization (2018)
Journal Article
Liu, J., Wang, J., Memon, H., Fu, Y., Barman, T., Choi, K., & Hou, X. (2019). Hydrophobic/icephobic coatings based on thermal sprayed metallic layers with subsequent surface functionalization. Surface and Coatings Technology, 357, 267-272. https://doi.org/10.1016/j.surfcoat.2018.10.002

Hydrophobic/icephobic coatings have been fabricated using a combination of thermal sprayed metallic MCrAlY (M = Ni, Co) coatings with a subsequent deposition process using 1H,1H,2H,2H-perfluorooctyltriethoxysilane (POTS). The MCrAlY coatings provide... Read More about Hydrophobic/icephobic coatings based on thermal sprayed metallic layers with subsequent surface functionalization.

Plasma virtual-roughness elements for cross-flow instability control (2018)
Journal Article
Choi, K., & Kim, J. (2018). Plasma virtual-roughness elements for cross-flow instability control. Experiments in Fluids, 59, Article 159. https://doi.org/10.1007/s00348-018-2609-x

Recent experiments and numerical simulations demonstrated that discrete roughness elements can be used to control cross-flow instability over a swept wing. Here, the application of this passive technique requires a row of thin cylindrical elements of... Read More about Plasma virtual-roughness elements for cross-flow instability control.

Development and evaluation of poly(dimethylsiloxane) based composite coatings for icephobic applications (2018)
Journal Article
Liu, J., Wang, J., Mazzola, L., Memon, H., Barman, T., Turnbull, B., …Hou, X. (2018). Development and evaluation of poly(dimethylsiloxane) based composite coatings for icephobic applications. Surface and Coatings Technology, 349, https://doi.org/10.1016/j.surfcoat.2018.06.066

Formation and accretion of ice on the leading edge surface of aircrafts wings may lead to disasters. The current de-icing system for aircraft will build up weight, increase energy consumption and add complexity to the aircraft systems. Development of... Read More about Development and evaluation of poly(dimethylsiloxane) based composite coatings for icephobic applications.

Output feedback control of flow separation over an aerofoil using plasma actuators (2018)
Journal Article
Broglia, R., Choi, K., Houston, P., Pasquale, L., & Zanchetta, P. (2018). Output feedback control of flow separation over an aerofoil using plasma actuators. International Journal of Numerical Analysis and Modeling, 15(6),

We address the problem of controlling the unsteady flow separation over an aerofoil, using plasma actuators. Despite the complexity of the dynamics of interest, we show how the problem of controlling flow separation can be formulated as a simple set... Read More about Output feedback control of flow separation over an aerofoil using plasma actuators.

Mixed ice accretion on aircraft wings (2018)
Journal Article
Janjua, Z. A., Turnbull, B., Hibberd, S., & Choi, K. (in press). Mixed ice accretion on aircraft wings. Physics of Fluids, 30(2), https://doi.org/10.1063/1.5007301

Ice accretion is a problematic natural phenomenon that an effects a wide range of engineering applications including power cables, radio masts and wind turbines. Accretion on aircraft wings occurs when supercooled water droplets freeze instantaneousl... Read More about Mixed ice accretion on aircraft wings.

Robust control of flow separation over a pitching aerofoil using plasma actuators (2017)
Journal Article
Pasquale, L., Broglia, R., Choi, K., Durante, D., & Zanchetta, P. (in press). Robust control of flow separation over a pitching aerofoil using plasma actuators. IFAC papers online, 50(1), https://doi.org/10.1016/j.ifacol.2017.08.1000

We address the problem of controlling the unsteady flow separation over an aerofoil, using plasma actuators. Despite the complexity of the dynamics of interest, we show how the problem of controlling flow separation can be formulated as a simple outp... Read More about Robust control of flow separation over a pitching aerofoil using plasma actuators.

Performance and durability tests of smart icephobic coatings to reduce ice adhesion (2017)
Journal Article
Janjua, Z. A., Turnbull, B., Choy, K., Pandis, C., Liu, J., Hou, X., & Choi, K. (2017). Performance and durability tests of smart icephobic coatings to reduce ice adhesion. Applied Surface Science, 407, https://doi.org/10.1016/j.apsusc.2017.02.206

The accretion of ice can damage applications ranging from power lines and shipping decks; to wind turbines and rail infrastructure. In particular on aircraft, it can change aerodynamic characteristics, greatly affecting the flight safety. Commercial... Read More about Performance and durability tests of smart icephobic coatings to reduce ice adhesion.

Super-hydrophobic/icephobic coatings based on silica nanoparticles modified by self-assembled monolayers (2016)
Journal Article
Liu, J., Janjua, Z. A., Roe, M., Xu, F., Turnbull, B., Choi, K., & Hou, X. (2016). Super-hydrophobic/icephobic coatings based on silica nanoparticles modified by self-assembled monolayers. Nanomaterials, 6(12), Article 232. https://doi.org/10.3390/nano6120232

A super-hydrophobic surface has been obtained from nanocomposite materials based on silica nanoparticles and self-assembled monolayers of 1H,1H,2H,2H-perfluorooctyltriethoxysilane (POTS) using spin coating and chemical vapor deposition methods. Scann... Read More about Super-hydrophobic/icephobic coatings based on silica nanoparticles modified by self-assembled monolayers.

Turbulent boundary-layer control with plasma spanwise travelling waves (2014)
Journal Article
Choi, K., & Whalley, R. (2014). Turbulent boundary-layer control with plasma spanwise travelling waves. Experiments in Fluids, 55(8), https://doi.org/10.1007/s00348-014-1796-3

Arrays of dielectric-barrier-discharge plasma actuators have been designed to generate spanwise travelling waves in the turbulent boundary layer for possible skin-friction drag reductions. Particle image velocimetry was used to elucidate the modifica... Read More about Turbulent boundary-layer control with plasma spanwise travelling waves.

Drag reduction in turbulent channel flow using bidirectional wavy Lorentz force (2014)
Journal Article
Huang, L., Choi, K., Fan, B., & Chen, Y. (2014). Drag reduction in turbulent channel flow using bidirectional wavy Lorentz force. Science China Physics, Mechanics and Astronomy, 57(11), https://doi.org/10.1007/s11433-014-5416-2

Turbulent control and drag reduction in a channel flow via a bidirectional traveling wave induced by spanwise oscillating Lorentz force have been investigated in the paper. The results based on the direct numerical simulation (DNS) indicate that the... Read More about Drag reduction in turbulent channel flow using bidirectional wavy Lorentz force.

BUTERLI D3.14 Report
Other
Kim, J., & Choi, K. BUTERLI D3.14 Report

Final actuator hardware producing a spanwise row of wall-normal jets

BUTERFLI D3.19 Report
Other
Kim, J., Forte, M., & Choi, K. BUTERFLI D3.19 Report

D3.19 Report on the experimental results on transition delay in the “Juju” TRIN1 wind tunnel by the VR DBD actuators based on wall-normal jets