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신병록,조강래 연세대학교 산업기술연구소 1983 논문집 Vol.15 No.2
The two-element airfoils of arbitrary shape are approximately mapped to the two circles by applying the von Karman-Trefftz function and Halsey's method. The flow about two-element airfoils is calculated from the flow about circles in the mapped plane. The effect of flap is investigated by comparing with the equivalent single airfoil. The increase of deflection angle of flap results in the increase of attack angle to the main airfoil. In the small attack angle the lift coefficient of the main airfoil is able to be approximated to the summation of the lift coefficients of the main airfoil when it is single and the increase of lift coefficient when it is in two element with zero attack angle.
신병록,윤건식 국립7개대학공동논문집간행위원회 2005 공업기술연구 Vol.5 No.-
이 논문에서는 캐비테션을 동반하는 기-액 2상유동의 해석을 휘한 수치해법을 제안한다. 본 수치해법에서는, 기-액 2상유동 특유의 압축성 및 비압축성 유동의 성격을 동시에 처리하기 위하여, 밀도를 기본으로하는 운동방정식을 전처리(preconditioning)하고, 계산노력의 향상을 위하여 다각화, 유속차 분리 및 MUSCL-TVD해법이 이용되었고, Runge-Kutta 차분해법으로 시간 적분하였다. 전처리 방법에 기-액 2상유동을 국소균질 개념의 단상매체 균질모델을 도입하므로서, 파동의 전파, 급격한 밀도변화, 낮은 마하수에서의 비압축성 유동성격등 이른바 캐비테션유동의 해석을 안정하고 용이하게 한다. 본 수치해법을 이용하여 캐비테션을 동반하지 않는 단상유동과 캐비테션 기-액 2상유동을 해석하고, 해법의 타당성과 유효성을 검토한다.
NUMERICAL INVESTIGATION OF INTERACTION BEHAVIOR BETWEEN CAVITATION BUBBLE AND SHOCK WAVE
Byeong Rog Shin,Young Joon An 한국전산유체공학회 2008 한국전산유체공학회 학술대회논문집 Vol.2008 No.-
A numerical method for gas-liquid two-phase flow is applied to solve shock-bubble interaction problems. The present method employs a finite-difference Runge-Kutta method and Roe's flux difference splitting approximation with the MUSCL-TVD scheme. A homogeneous equilibrium cavitation model is used. By this method, a Riemann problem for shock tube was computed for validation. Then, shock-bubble interaction problems between cylindrical bubbles located in the liquid and incident liquid shock wave are computed.
NUMERICAL METHODS FOR CAVITATING FLOW
Byeong Rog SHIN 한국전산유체공학회 2001 한국전산유체공학회 학술대회논문집 Vol.2001 No.-
In this paper, some numerical methods recently developed for gas-liquid two-phase flows are reviewed. And then, a preconditioning method to solve cavitating flow by the author is introduced. This method employs a finite-difference Runge-Kutta method combined with MUSCL TVD scheme, and a homogeneous equilibrium cavitation model. So that it permits to treat simply the whole gas-liquid two-phase flow field including wave propagation, large density changes and incompressible flow characteristic at low Mach number. Finally, numerical results such as detailed observations of the unsteady cavity flows, a sheet cavitation break-off phenomena and some data related to performance characteristics of hydrofoils are shown.
Application of Preconditioning Method to Cavitating Flow Computation
Byeong Rog SHIN 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
A preconditioned numerical method for gas-liquid two-phase flows is applied to solve cavitating flow. The present method employs a finite-difference dual time-stepping integration procedure and the MUSCLTVD scheme. A homogeneous equilibrium cavitation model is used. The present density-based numerical method permits simple treatment of the whole gas-liquid two-phase flow field, including wave propagation, large density changes and incompressible flow characteristics at low Mach number. Some internal flows such as convergent-divergent nozzles are computed using this method. Comparisons of predicted and experimental results are provided and discussed.
신병록(Byeong Rog Shin) 한국전산유체공학회 2007 한국전산유체공학회 학술대회논문집 Vol.2007 No.-
A high resolution numerical method aimed at solving gas-liquid two-phase flow is proposed and applied to gas-liquid two-phase shock tube problem. The present method employs a finite-difference 4th-order Runge-Kutta method and Roe's flux difference splitting approximation with the MUSCL TVD scheme. By applying the homogeneous equilibrium cavitation model, the present density-based numerical method permits simple treatment of the whole gas-liquid two-phase flow field, including wave propagation and large density changes. The speed of sound for gas-liquid two-phase media is derived on the basis of thermodynamic relations and compared with that by eigenvalues. By this method, a Riemann problem for Euler equations of one dimensional shock tube was computed. Numerical results such as detailed observations of shock and expansion wave propagations through the gas-liquid two-phase media and some data related to computational efficiency are made. Comparisons of predicted results and exact solutions are provided and discussed.
A THREE-DIMENSIONAL PASSAGE FLOW ANALYSIS METHOD AIMED AT TURBOMACHINERY ELEMENTS
신병록(Byeong Rog SHIN) 한국전산유체공학회 1995 한국전산유체공학회 학술대회논문집 Vol.1995 No.-
Incompressible developing entry flows through square ducts with 90 degree bends are studied numerically by using an efficient implicit SMAC scheme with different boundary conditions. This study eventually aimed at passage flow analysis of turbomachinery elements with a strong curvature such as centrifugal impeller or draft tube. The generalized implicit scheme used in the present study has been developted to solve the threedimensional Navier-Stokes equations by the author. Numerical results for some different numerical conditions are obtained and compared with each other.