Sang-Hoon Yoon

I hold a Ph.D. in Mechanical and Aerospace Engineering from Seoul National University, with extensive experience in fluid-structure interaction (FSI) analysis, all-speed flow analysis with RANS/DES modeling, design optimization, high-performance computing (HPC), multidisciplinary system development, unsteady flow and structural dynamic characteristics, and cross-validation with experiments.

During my Ph.D., I developed an in-house software for FSI numerical modeling and achieved the highest level of precision in flapping analysis of flexible wings. I directly utilized this program to perform multidisciplinary optimization for aircraft development and contributed to the development of the aircraft with the highest propulsive efficiency among existing flapping-wing aircraft. Additionally, I conducted research on flow instability reduction technology for the Korean next-generation fighter jets (KF-X) and performance prediction of the next-generation Korean rotorcraft.

With three published journal papers, attendance at 21 academic conferences, three awards, and registration of copyrights for five software programs, I have demonstrated dedication to research excellence. I also served as the head of the research lab and team leader for high-performance computing clusters, gaining valuable experience in project management and team collaboration.

Awards

• The first prize, Korea Aerospace Industries (KAI) Journal Award, 2019.10.
• Best paper award, Korean Society for Aeronautical and Space Sciences, 2020.07.
• Achievement award, Bio-mimetic Robot Research Center, Agency for Defense Development (ADD), 2021.12.

Major academic achievements

• Effect of wing deformation by camber angle on aerodynamic performance of flapping micro air vehicles, AIAA Aviation Forum, 2019.
• Effects of camber angle on aerodynamic performance of flapping-wing micro air vehicle, Journal of Fluids and Structures, 2020.
• Experimental surrogate-based design optimization of wing geometry and structure for flapping wing micro air vehicles, Aerospace Science and Technology, 2022.
• Effect of structural dynamic characteristics on aerodynamic performance of flapping-wing micro air vehicle, (to be published in Aerospace Science and Technology in 2023).

Published 3 journal papers, attendance at 21 academic conferences.

Research project with Agency for Defense Development and LIG Nex1 (June 2014 - December 2021):

• Developed an in-house software for fluid-structure interaction numerical modeling using Fortran90 and C++, which includes CFD (3-D unsteady incompressible Navier-Stokes equations), CSD (2-D nonlinear beam-shell assemblage in co-rotational frame), data transfer, grid movement & overlapping grids, and coupling interfaces.
• Achieved the highest level of precision in flapping analysis of flexible wings by performing detailed modeling (complex shape, multiple materials) and cross-validation with experiments, with a thrust error of approximately 1%, surpassing all existing analysis methods.
• Developed a flapping-wing aircraft based on optimal design and aerodynamic elasticity analysis, achieving the highest propulsive efficiency (T/P=9.7) among existing flapping-wing aircraft through design parameter analysis.

Research project with Korea Aerospace Industries (August 2016 - August 2018; July 2021 - present):

• Conducted research on flow instability (abrupt wing stall) reduction technology for Korean next-generation fighter jets (KF-X).
• Conducting research on performance prediction of the next-generation Korean rotorcraft.
• Conducting numerical simulations using DES turbulence models for 3-D unsteady all-speed flow analysis and validating with experimental results from Korea Aerospace Industries.
• Analyzing the causes of flow instability and proposing improvement measures for performance enhancement of the initially derived shape.

Korea Copyright Commission

• The 2-D flexible wing fluid-structure interaction analysis program (linear) enables high-precision non-steady 2-D flow analysis, VIV modeling, linear behavior analysis, and high-efficiency simulation. (C-2016-007795)
• The 2-D flexible wing fluid-structure interaction analysis program (nonlinear), which enables high-precision non-steady 2-D flow analysis, nonlinear behavior modeling, and anisotropic modeling. (C-2016-007796)
• The 3-D flexible wing fluid-structure interaction analysis program (single-element) enables high-precision non-steady 3-D flow analysis, single-material/isotropic material modeling. (C-2018-013042)
• The 3-D flexible wing fluid-structure interaction analysis program (multi-element) enables high-precision non-steady 3-D flow analysis, overlapping mesh modeling, anisotropic material modeling, and composite boundary condition modeling. (C-2018-027180)
• The optimal design program applies multi-disciplinary design parameters for flapping-wing aircraft. (C-2021-054747)

Korea Copyright Commission

• The 2-D flexible wing fluid-structure interaction analysis program (linear) enables high-precision non-steady 2-D flow analysis, VIV modeling, linear behavior analysis, and high-efficiency simulation. (C-2016-007795)
• The 2-D flexible wing fluid-structure interaction analysis program (nonlinear), which enables high-precision non-steady 2-D flow analysis, nonlinear behavior modeling, and anisotropic modeling. (C-2016-007796)
• The 3-D flexible wing fluid-structure interaction analysis program (single-element) enables high-precision non-steady 3-D flow analysis, single-material/isotropic material modeling. (C-2018-013042)
• The 3-D flexible wing fluid-structure interaction analysis program (multi-element) enables high-precision non-steady 3-D flow analysis, overlapping mesh modeling, anisotropic material modeling, and composite boundary condition modeling. (C-2018-027180)
• The optimal design program applies multi-disciplinary design parameters for flapping-wing aircraft. (C-2021-054747)