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Article
Improvement of Heat Transfer Model Considering Heat Transfer Deterioration of Supercritical Fluid in Cooling Channel of Scramjet Propulsion System
The optimization of air-breathing hypersonic propulsion system designs is crucial for ensuring the viability of aircraft in extreme thermal environments. Integrating a reliable heat transfer model of regenerat...
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Article
Analysis of Aerodynamic Characteristics of Rear Wing Mounted on Fastback Type Vehicle
The performance parameters of automobiles are mainly determined by aerodynamic characteristics such as lift and drag. To maximize vehicle performance, besides optimizing the vehicle itself, various aerodynamic...
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Article
Efficient Aerodynamic Analysis of Air-Breathing Hypersonic Vehicle using Local Surface Inclination Method based on Unstructured Meshes
An efficient aerodynamic analysis was conducted for rapid prediction of the aerodynamic performance of air-breathing hypersonic vehicles in the early design phase. Surface pressure calculation on compression s...
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Article
Numerical Simulation of Streamer Physics in Nanosecond Pulsed Surface Discharges
Two-dimensional numerical simulations of a nanosecond pulsed single dielectric barrier discharge (SDBD) are performed in air. Streamers produced in nanosecond SDBDs have filamentary properties and generate a s...
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Article
Comparative investigation on the aerodynamic effects of combined use of underbody drag reduction devices applied to real sedan
To reduce the aerodynamic drag, the performance of the underbody aerodynamic drag reduction devices was evaluated based on the actual shape of a sedan-type vehicle. An undercover, under-fin, and side air dam w...
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Article
Investigation on aerodynamic drag of Korean high speed train (HEMU-430X) due to roof apparatus for electrical device
To explore the need for a roof apparatus for an electrical device, such as a pantograph cover or additional cover, the total aerodynamic drag of HEMU-430X, which is a high-speed train developed in South Korea ...
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Article
Experimental study on synthetic jet array for aerodynamic drag reduction of a simplified car
This paper describes an experimental parametric study of synthetic jet array actuation to reduce the aerodynamic drag of a threedimensional simplified car. By using two configurations of an Ahmed body with 25°...
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Article
Multi-disciplinary design optimization and performance evaluation of a single stage transonic axial compressor
The multidisciplinary design optimization method, which integrates aerodynamic performance and structural stability, was utilized in the development of a single-stage transonic axial compressor. An approximati...
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Article
Fundamental studies on free stream acceleration effect on drag force in bluff bodies
This paper describes fundamental studies on free stream acceleration effect on drag force in bluff bodies. The flow with gradual velocity increase assumed an accelerated flow. The wind tunnel tests were conduc...
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Article
Optimal cross-sectional area distribution of a high-speed train nose to minimize the tunnel micro-pressure wave
Optimization of the cross-sectional area distribution of a high-speed train nose is conducted for various nose lengths in order to minimize the micro-pressure wave intensity at a tunnel exit. To this end, an i...
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Chapter and Conference Paper
Development of AUSM-Type Solver for Analysis of Ideal Magnetohydrodynamic Flows
AUSMPW+ and M-AUSMPW+ were modified to solve the equations of the ideal Magnetohydrodynamics(MHD). Discontinuity-sensing functions in AUSMPW+ and M-AUSMPW+ were newly defined for MHD equations. In order to obt...
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Chapter and Conference Paper
Enhancement of the Computational Efficiency of UFP via a MWM
Recently, in Computational Fluid Dynamics (CFD), the computational accuracy and efficiency have been enhanced with the aids of numerical schemes and computing systems. However, for the accurate calculations of...
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Chapter and Conference Paper
Computation of Multiphase Mixture Flows using RoeM and AUSMPW + Schemes
RoeM [1] and AUSMPW+[2] schemes, originally developed for the robust and accurate simulation of single phase gas dynamics, are extended to the compressible gas-liquid two-phase flows. We adopted homogeneous eq...
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Chapter and Conference Paper
Multi-dimensional Limiting Process for Two- and Three-dimensional Flow Physics Analyses
In this paper, we extend the idea of MLP to three-dimensional space and present the multi-dimensional limiting process for three-dimensional flow. The basic idea of the multi-dimensional limiting condition is ...
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Chapter and Conference Paper
Accurate and Efficient Re-evaluation of Cell-interface Convective Fluxes
A new treatment of cell-interface convective fluxes in AUSM-type methods is introduced to substantially reduce the numerical dissipation in a smooth region, including a contact discontinuity, without compromis...
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Chapter and Conference Paper
Accurate and Efficient Multi-dimensional TVD Interpolation
Through numerical analysis and tests, MHTVD is derived and shown to enhance accuracy and robustness simultaneously in regions of a shock discontinuity as well as a boundary-layer. In addition, it is also very ...
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Chapter and Conference Paper
Uncertainty of Solution in Euler Equations and Numerical Instability
Numerical instability is studied based on numerics and mathematics. It is frequently observed in the region where velocity is zero. In that region, Euler equations have numerous solutions and, thus, it is impo...
