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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.
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.
신병록(Byeong Rog Shin) 한국전산유체공학회 2009 한국전산유체공학회 학술대회논문집 Vol.2009 No.11
A density based method with homogeneous cavitation model to investigate cavitation-bubble collapsing behavior is proposed and applied to bubble-shock interaction problems. By applying this method, cylindrical bubbles located in the liquid and incident liquid shock wave are computed. Bubble collapsing behavior, shock-bubble interaction and shock transmission/reflection pattern are investigated.
신병록(Byeong Rog Shin) 한국전산유체공학회 2007 한국전산유체공학회지 Vol.12 No.2
A high resolution numerical method aimed at solving cavitating 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 at isothermal condition and some data related to computational efficiency are made. Comparisons of predicted results and exact solutions are provided and discussed.
낮은 Mach수 유동해석을 위한 Preconditioning 가중계수의 의존성에 관한 연구
안영준(Young-Joon An),신병록(Byeong-Rog Shin) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
A dependence of the parameter in precondition method for solving low Mach number flow with incompressible flow nature is investigate. The present method employs a finite-difference method applied Roe's flux difference splitting approximation with the MUSCL-TVD scheme and high order Runge-Kutta method. From the computational results of 2-D internal flows through a backward-facing step duct an appropriate value of the parameter is suggested. High accuracy and stable computational results are obtained for the flow with low Mach number at β of 50 in the range of Mach number less than 0.3.
안영준(Young-Joon An),신병록(Byeong-Rog Shin) 한국유체기계학회 2009 유체기계 연구개발 발표회 논문집 Vol.2009 No.-
Numerical simulation is carried out to investigate 3-D complex flow and performance characteristics of double-suction centrifugal pump. Double-section centrifugal pump consisted of six blades impeller and shroud ring. Rotating speed of closed type impeller is 3000 rpm. Finite-volume method with structured mesh and k-ω Shear Stress Transport turbulence model was used to guaranty more accurate prediction of turbulent flow in the pump impeller. Total head, power and overall efficiency were calculated according to the variation of flow rate to obtain performance characteristics of two types of pump. From the results, impeller having smooth curve along the shroud line obtained good performance. Complicated internal flow phenomena through impellers such as flow separation, pressure loss, flow unsteadiness and performance are investigated and discussed.
박선호(Sunho Park),이신형(Shin Hyung Rhee),신병록(Byeong Rog Shin) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.11
Cavitation on an axi-symmetric hemispherical head-form body was studied using an Reynolds-averaged Navier-Stokes equations solver based on a cell-centered finite volume method. To consider compressibility effects on the vapor phase and cavity interface, a pressure-based compressible flow solver was developed. To validate the developed solver, cavitating flow around the hemispherical head-form body was simulated using pressure-based incompressible and compressible solvers and validated against existing experimental data in the three-way comparison. The cavity shedding behavior, length of re-entrant jet, drag history, and Strouhal number of the hemispherical head-form body were compared between two solvers. The results, in this paper, suggested that the computations of cavitating flow with compressibility effects improve the description of cavity dynamics.
Louver Fin의 배열이 열교환기의 성능향상에 미치는 영향에 관한 연구
차동곤(Dong Gon Cha),신병록(Byeong Rog Shin) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Compact heat exchangers have been widely used in various applications in thermal fluid systems including automobile thermal management systems. Among the several types of heat exchangers for engine cooling applications, cross flow compact heat exchanger with Louvered fins are highly special interest because of their higher heat release rate with lower air pressure drop. In this study, the critical parameter in louver fin geometry for heat exchanger performance and air pressure drop are figure out. Also the effect of the parameter changes of the heat exchanger on the heat release rate is examined. The results can be applied to the optimal design and manufacturing method of the compact heat exchanger with high performance.