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김경성(K.S. Kim),박종천(J.C. Park) 한국전산유체공학회 2010 한국전산유체공학회지 Vol.15 No.1
In general, flow analysis programs have been built in not JAVA language but such as Fortran, C or C++ because of a merit in performance of computation. However, most developer of those languages are not free for use. User should purchase the development tools of programs, and install it on their own computer. Fortunately, JAVA is a free software, and can be used to develop WEB-based programs. It is well known that the JAVA language is time consuming for calculating. However, the performance of computer power has been increased continuously, so it is sure that the former states can be overcome. In the present study, a flow analysis program, which is interactive with Graphics, using the Web-based programing language, JAVA, has been developed for solving the two-dimensional flow motion.
JAVA를 이용한 WEB-기반 유동 해석 프로그램의 개발
김경성(K.-S. Kim),박종천(J.-C. Park) 한국전산유체공학회 2007 한국전산유체공학회 학술대회논문집 Vol.2007 No.-
객체지향 언어인 JAVA를 이용하여 Web-기반의 유동 해석 프로그램을 개발하였다. 지금까지 운동해석에 관한 대부분의 프로그램은 Fortran, C, C++와 같은 언어로 이루어져 있으며 이 경우 계산 속도는 빠르지만, 각 언어의 Compiler와 Builder를 필요로 한다. 따라서 사용된 각각의 언어에 대한 Compiler 및 Builder자 사용자 의 개인용 컴퓨터 장에서만 절치 및 구동될 수 있으며, 그로 인해 사용자는 계산된 Data형 결과물만을 얻을 수 있었다 본 연구에서는 이를 개선하고자 객체지향형 언어인 JAVA를 이용하여 유동해석 프로그램을 구성할 수 있는 기반을 구축하였으며, Web과 연동하여 시간적ㆍ공간적 제약을 극본하고 사용자의 의견 개입을 가능 하게 하였다 일반적으로 JAVA 언어는 연산속도가 느려서 수치해석용으로는 부적합 하다는 평이 지배적 이였으나 컴퓨터의 성능 발달로 이는 개선이 될 수 있으며 이는 사용자자가 시간적 ! 공간적 제약을 받지 않고 사용 가능하다는 점에서 극복되어 질 수 있다.
슬로싱 해석을 위한 CCUP 기반 시뮬레이션 기술 개발
박종천(J.-C. Park),황성철(S.-C. Hwang),정세민(S.-M. Jeong) 한국전산유체공학회 2011 한국전산유체공학회지 Vol.16 No.2
A new computational program, which is based on the CIP/CCUP(Constraint interpolation Profile/CIP Combined Unified Procedure) method, has been developed to numerically analyse sloshing phenomena dealt as multiphase-flow problems, For the convection terms of Navier-Stokes equations, the RCIP(Rational function CIP) method was adopted and the THINC-WLIC(Tangent of Hyperbola for Interface Capturing-Weighted Line Interface Calculation) method was used to capture the air/water interface. To validate the present numerical method. two-dimensional dam-breaking and sloshing problems in a rectangular tank were solved by the developed method in a stationary Cartesian grid system, in the case of sloshing problems, simulations by using a improved MPS(Moving Particle Simulation) method, which is named as PNU-MPS(Pusan National University-MPS), were also carried alit, The computational results are compared with those of experiments and most of the comparisons are reasonably good.
박종천(J.C. Park),이병혁(B.H. Lee),정성준(S.J. Jung) 한국전산유체공학회 2007 한국전산유체공학회 학술대회논문집 Vol.2007 No.-
A particle method recognized as one of the gridless methods has been developed to investigate the nonlinear free-surface motions interacting to the structures. The method is more feasible and effective than convectional grid methods for solving the non-linear free-surface motion with complicated boundary shapes. The right-handed side of the governing equations for incompressible fluid, which includes gradient, viscous and external force terms, can be replaced by the particle interaction models. In the present study, the developed method is applied to the dam-broken problem on dried- and wet-floor and its adequacy will be discussed by the comparison with the experimental results.
NUMERICAL SIMULATIONS OF FULLY NONLINEAR WAVE MOTIONS IN A DIGITAL WAVE TANK
J.C. Park(박종천),K.S. Kim(김경성) 한국전산유체공학회 2006 한국전산유체공학회지 Vol.11 No.4
A digital wave tank (DWT) simulation technique has been developed by authors to investigate the interactions of fully nonlinear waves with 3D marine structures. A finite-difference/volume method and a modified marker-and-cell (MAC) algorithm have been used, which are based on the Navier-Stokes (NS) and continuity equations. The fully nonlinear kinematic free-surface condition is implemented by the marker-density function (MDF) technique or the Level-Set (LS) technique developed for one or two fluid layers. In this paper, some applications for various engineering problems with free-surface are introduced and discussed. It includes numerical simulation of marine environments by simulation equipments, fully nonlinear wave motions around offshore structures, nonlinear ship waves, ship motions in waves and marine flow simulation with free-surface. From the presented simulations, it seems that the developed DWT simulation technique can handle various engineering problems with free-surface and reliably predict hydrodynamic features due to the fully-nonlinear wave motions interacting with such marine structures.