• Title/Summary/Keyword: Computational Fluid Dynamics(전산유체역학)

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A STUDY OF FLOW CHARACTERISTICS AND DESIGN VARIABLES IN AN LPG INJECTOR (LPG Injector 컷솔 유동 특성 및 설계 변수 연구)

  • Lee, Joon-Sik;Lim, Seol;Kim, Sang-Dug;Song, Dong-Joo
    • 한국전산유체공학회:학술대회논문집
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    • 2008.10a
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    • pp.239-243
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    • 2008
  • Fluid flow in LPG injector is delayed momently around nozzle and leaked accidentally, then engine operation becomes unstable. When attached cutsole injector that we can prevent fuel from leaking. Attaching additional devices cause loss of power and pressure. In this study, We has analyzed the performance of the LPG injector nozzle by changing cutsole geometry numerously by using Computational Fluid Dynamics.

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Investigation for the Characteristics of Cavitation Modeling for Computational Fluid Dynamics (전산유체역학을 위한 공동모델의 특성 조사)

  • Park, Sun-Ho;Rhee, Shin-Hyung
    • Journal of the Society of Naval Architects of Korea
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    • v.47 no.5
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    • pp.657-669
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    • 2010
  • Cavitation is one of the most difficult physical phenomena to understand and predict. Many experimental and computational studies have been conducted for better understanding of the phenomenon. Recently, with the rapid development of computing hardware capacity and numerical methods, considerable advancement is observed in prediction of cavitation using computational fluid dynamics. To that end, many cavitation models have been developed and reported. In the present paper, some of the distinguished cavitation models are categorized and reviewed in terms of the computational frame work and formulation of transport equations. Then those characteristics are compared with each other.

Computational Design of a Disk-Shape Boundary-Layer Pump (원반형 경계층 펌프의 전산 설계)

  • Jeong, S.Y.;Chang, S.M.;Yang, J.S.
    • The KSFM Journal of Fluid Machinery
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    • v.13 no.2
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    • pp.12-17
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    • 2010
  • A kind of disk-shape boundary layer pump is designed numerically by using a software of computational fluid dynamics, which is widely used for the special purposes such as artificial hearts, bio-fluidics and transportation of oceanic lives, etc. From the numerical simulation with an axisymmetric model, some benchmark problems are tested and compared with experimental results. The performance of disk pump is graphically visualized from the computational results, and converted to the dimensionless parameters. Finally, the obtained numerical data in the present investigation can be used for the baseline for new design to achieve a more efficient disk pump.

Transonic Flutter Characteristics of the AGARD 445.6 Wing Considering DES Turbulent Model and Different Angle-of-Attacks (DES 난류모델 및 받음각 변화를 고려한 AGARD 445.6 날개의 천음속 플러터 응답 특성)

  • Kim, Yo-Han;Kim, Dong-Hyun
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.18 no.1
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    • pp.27-32
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    • 2010
  • In this study, transonic flutter response characteristics have been studied for the AGARD 445.6 wing considering various turbulent models and several angle of attacks. The developed fluid-structure coupled analysis system is applied for flutter computations combining computational structural dynamics(CSD), finite element method(FEM) and computational fluid dynamics(CFD) in the time domain. The flutter boundaries of AGARD 445.6 wing are verified using developed computational system. For the nonlinear unsteady aerodynamics in high transonic flow region, DES turbulent model using the structured grid system have been applied for the wing model. Characteristics of flutter responses have been investigated for various angle of attack conditions. Also, it is typically shown that the current computation approach can yield realistic and practical results for aircraft design and test engineers.

Computational Fluid Dynamics Study on Two-Dimensional Sloshing in Rectangular Tank (사각형 탱크 내에서의 2차원 슬로싱에 대한 전산유체 역학적 연구)

  • Kwack, Young-Kyun;Ko, Sung-Ho
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.27 no.8
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    • pp.1142-1149
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    • 2003
  • The present study describes a numerical analysis for simulation of the sloshing of flows with free-surface which contained in a rectangular tank moving in harmonic or pitching motion. The VOF function, representing the volume fraction of a cell occupied by the fluid, is calculated for each cells, which gives the location of the free-surface filling any some fraction of cells with fluid. The time-dependent changes of free-surface height are used for visualization subject to several conditions such as fluid height, horizontal acceleration, sinusoidal motion, and viscosity. The free-surface heights were used for comparing wall-force, which is caused by sloshing of flows. Damping effects by baffles were extensively investigated for various conditions in terms of baffle shape and position.

Fluid/Structure Coupled Analysis of 3D Turbine Blade Considering Stator-rotor Interaction (스테이터-로터 상호간섭 효과를 고려한 3차원 터빈 블레이드의 유체/구조 연계해석)

  • Kim, Yu-Sung;Kim, Dong-Hyun;Kim, Yo-Han;Park, Oung
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.19 no.8
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    • pp.764-772
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    • 2009
  • In this study, fluid/structure coupled analyses have been conducted for 3-D stator and rotor configuration. Advanced computational analysis system based on computational fluid dynamics(CFD) and computational structural dynamics(CSD) has been developed in order to investigate fluid/structure responses of general stator-rotor configurations. To solve the fluid/structure coupled problems, fluid domains are modeled using the structural grid system with dynamic moving and local deforming techniques. Reynolds-averaged Navier-Stokes equations with Spalart-Allmaras(S-A) and SST ${\kappa}-{\omega}$ turbulence models are solved for unsteady flow problems. A fully implicit time marching scheme based on the Newmark direct integration method is used for computing the coupled aeroelastic governing equations of the 3-D turbine blades for fluid-structure interaction(FSI) problems. Detailed fluid/structure analysis responses for stator-rotor interaction flow conditions are presented to show the physical performance and flow characteristics.

Fluid/structure Coupled Analysis of 3D Turbine Blade Considering Stator-Rotor Interaction (스테이터-로터 상호간섭 효과를 고려한 3차원 터빈 블레이드의 유체/구조 연계해석)

  • Kim, Yu-Sung;Kim, Dong-Hyun;Kim, Yo-Han;Park, Oung
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2008.11a
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    • pp.563-569
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    • 2008
  • In this study, fluid/structure coupled analyses have been conducted f3r 3-D stator and rotor configuration. Advanced computational analysis system based on computational fluid dynamics (CFD) and computational structural dynamics (CSD) has been developed in order to investigate fluid/structure responses of general stator-rotor configurations. To solve the fluid/structure coupled problems, fluid domains are modeled using the structural grid system with dynamic moving and local deforming techniques. Reynolds-averaged Navier-Stokes equations with Spalart-Allmaras (S-A) and SST ${\kappa}-{\omega}$ turbulence models are solved for unsteady flow problems. A fully implicit time marching scheme based on the Newmark direct integration method is used for computing the coupled aeroelastic governing equations of the 3-D turbine blades for fluid-structure interaction (FSI) problems. Detailed fluid/structure analysis responses for stator-rotor interaction flow conditions are presented to show the physical performance and flow characteristics.

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Prediction of Deformation of an Oil-fence by using Fluid$\cdot$Structure Interaction Method (유체$\cdot$구조물 상호 작용 기법을 이용한 오일 펜스의 변형 예측)

  • Kim T. G.;Kim W.;Hur N.
    • Journal of computational fluids engineering
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    • v.5 no.3
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    • pp.16-22
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    • 2000
  • In the present study a method of computing fluid-structure interaction is presented to simulate the deformation shape of an oil fence which is used to contain or to divert the split oil in sea water. The computation is performed by taking into account of the force and moment balance in each computational element of the oil fence. The forces and moments acting on each element of the structure is computed from the flow analysis, which in turn is used to predict deformed shape of the structure until the procedure converges. The flexibility of the oil fence was also considered in the analysis. It is shown from the present study that the predicted deformed shapes agree quite well with the available experiment data.

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Computational analysis of coupled fluid-structure for a rotor blade in hover (정지 비행하는 로터 블레이드의 전산 유체-구조 결합 해석)

  • Kim, Hae-Dong
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.36 no.12
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    • pp.1139-1145
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    • 2008
  • numerical study on the coupled fluid-structure for a rotor blade in hover was conducted. Computational fluid dynamics code with enhanced wake-capturing capability is coupled with a simple structural dynamics code based on Euler-Bernoulli's beam equation. The numerical results show a reasonable blade structural deformation and aerodynamic characteristics.