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Phase change surfaces with porous metallic structures for long-term anti/de-icing application (2024)
Journal Article
Yang, D., Bao, R., Clare, A. T., Choi, K., & Hou, X. (2024). Phase change surfaces with porous metallic structures for long-term anti/de-icing application. Journal of Colloid and Interface Science, 660, 136-146. https://doi.org/10.1016/j.jcis.2024.01.091

Hypothesis Ice mitigation has received increasing attention due to the severe safety and economic threats of icing hazards to modern industries. Slippery icephobic surface is a potential ice mitigation approach due to its ultra-low ice adhesion stre... Read More about Phase change surfaces with porous metallic structures for long-term anti/de-icing application.

Plasma flow control of the tip vortices over a very low aspect-ratio wing (2022)
Journal Article
Dong, L., Choi, K. S., & Wang, Y. (2022). Plasma flow control of the tip vortices over a very low aspect-ratio wing. Physics of Fluids, 34(8), Article 087101. https://doi.org/10.1063/5.0101110

Flow control of the tip vortices over a very low aspect-ratio wing was carried out using the dielectric-barrier-discharge plasma actuators. The results indicate a large change in the aerodynamic forces by plasma flow control, where the lift coefficie... Read More about Plasma flow control of the tip vortices over a very low aspect-ratio wing.

Development and interaction of vortices over a very low aspect-ratio wing under pitch-up motion (2022)
Journal Article
Dong, L., Choi, K.-S., Mao, X., & Wang, Y. (2022). Development and interaction of vortices over a very low aspect-ratio wing under pitch-up motion. Journal of Fluid Mechanics, 943, Article A42. https://doi.org/10.1017/jfm.2022.451

The vortical structures over a thin rectangular wing with a very low aspect ratio of 0.277 were investigated in a wind tunnel at an effective Reynolds number of 3×106. When applying pitch-up motion pivoted at mid-chord, the maximum lift angle was inc... Read More about Development and interaction of vortices over a very low aspect-ratio wing under pitch-up motion.

Opposition control of turbulent spots (2022)
Journal Article
Wang, Y. X., Choi, K. S., Gaster, M., Atkin, C., Borodulin, V., & Kachanov, Y. (2022). Opposition control of turbulent spots. Journal of Fluid Mechanics, 943, Article A3. https://doi.org/10.1017/jfm.2022.396

Opposition control of artificially initiated turbulent spots in a laminar boundary layer was carried out in a low-turbulence wind tunnel with the aim to delay transition to turbulence by modifying the turbulent structure within the turbulent spots. T... Read More about Opposition control of turbulent spots.

Hydrophobically/oleophilically guarded powder metallurgical structures and liquid impregnation for ice mitigation (2022)
Journal Article
Yang, D., Bao, R., Choi, K. S., Clare, A. T., & Hou, X. (2022). Hydrophobically/oleophilically guarded powder metallurgical structures and liquid impregnation for ice mitigation. Chemical Engineering Journal, 446, Article 137115. https://doi.org/10.1016/j.cej.2022.137115

Icing hazards often pose operational and safety challenges. Various surface and coating approaches have been attempted for ice mitigation purposes, but the durability remains an outstanding issue. Inspired by traditional powder metallurgy and slipper... Read More about Hydrophobically/oleophilically guarded powder metallurgical structures and liquid impregnation for ice mitigation.

A phase-field method for three-phase flows with icing (2022)
Journal Article
Zhang, W., Shahmardi, A., Choi, K.-S., Tammisola, O., Brandt, L., & Mao, X. (2022). A phase-field method for three-phase flows with icing. Journal of Computational Physics, 458, Article 111104. https://doi.org/10.1016/j.jcp.2022.111104

A numerical scheme to simulate three-phase fluid flows with phase change is proposed. By combining the Cahn-Hilliard model for water-air interface, Allen-Cahn equation for ice and fluid and Navier-Stokes equation for momentum, we solve the evolution... Read More about A phase-field method for three-phase flows with icing.

Aerodynamic and aeroacoustic optimization of leading-edge undulation of a naca 65(12)-10 airfoil (2021)
Journal Article
Kim, J. H., Choi, K. S., Lacagnina, G., Paruchuri, C., Joseph, P., Hasheminejad, S. M., …Pinelli, A. (2021). Aerodynamic and aeroacoustic optimization of leading-edge undulation of a naca 65(12)-10 airfoil. AIAA Journal, 60(4), 2342-2353. https://doi.org/10.2514/1.J060716

Experimental studies of a NACA 65(12)-10 airfoil with a sinusoidal leading-edge undulation (LEU) were carried out to simultaneously optimize its aerodynamic and aeroacoustic performances by considering the attached as well as the separated flow at th... Read More about Aerodynamic and aeroacoustic optimization of leading-edge undulation of a naca 65(12)-10 airfoil.

Early development of artificially initiated turbulent spots (2021)
Journal Article
Wang, Y. X., Choi, K.-S., Gaster, M., Atkin, C., Borodulin, V., & Kachanov, Y. (2021). Early development of artificially initiated turbulent spots. Journal of Fluid Mechanics, 916, Article A1. https://doi.org/10.1017/jfm.2021.152

An experimental investigation was carried out in a low-turbulence wind tunnel to study the early development of artificially initiated turbulent spots in a laminar boundary layer over a flat plate. Their reproducibility allowed us to observe fine str... Read More about Early development of artificially initiated turbulent spots.

Transitional pulsatile flows with stenosis in a two-dimensional channel (2021)
Journal Article
Ding, G., Choi, K.-S., Ma, B., Kato, T., & Yuan, W. (2021). Transitional pulsatile flows with stenosis in a two-dimensional channel. Physics of Fluids, 33(3), Article 034115. https://doi.org/10.1063/5.0042753

Although blood flows are mostly laminar, transition to turbulence and flow separations are observed at curved vessels, bifurcations, or constrictions. It is known that wall-shear stress plays an important role in the development of atherosclerosis as... Read More about Transitional pulsatile flows with stenosis in a two-dimensional channel.

Intrinsic dependence of ice adhesion strength on surface roughness (2020)
Journal Article
Memon, H., Liu, J., De Focatiis, D. S., Choi, K.-S., & Hou, X. (2020). Intrinsic dependence of ice adhesion strength on surface roughness. Surface and Coatings Technology, 385, Article 125382. https://doi.org/10.1016/j.surfcoat.2020.125382

The roles of surface roughness on icephobicity including ice adhesion strength have been long debated in icephobicity studies. However, the direct/systematic influence of surface roughness on ice adhesion strength while keeping other surface characte... Read More about Intrinsic dependence of ice adhesion strength on surface roughness.

Mechanisms of airfoil noise near stall conditions (2019)
Journal Article
Lacagnina, G., Chaitanya, P., Berk, T., Kim, J.-H., 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.

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), Article 104. 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.

Plasma virtual-roughness elements for cross-flow instability control (2018)
Journal Article
Choi, K.-S., & Kim, J.-H. (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.

Output feedback control of flow separation over an aerofoil using plasma actuators (2018)
Journal Article
Broglia, R., Choi, K.-S., 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.

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.

Turbulent boundary-layer control with plasma spanwise travelling waves (2014)
Journal Article
Choi, K.-S., & Whalley, R. (2014). Turbulent boundary-layer control with plasma spanwise travelling waves. Experiments in Fluids, 55(8), Article 1796. 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.-S., 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.