• Title/Summary/Keyword: 유한체적법

Search Result 349, Processing Time 0.072 seconds

Development of a Solver for 3-D Flows with Free Surface using the Finite Volume Method on Unstructured Grids (비정렬 격자 유한체적법을 이용한 삼차원 자유표면 유동 해석 코드의 개발)

  • Yim, Joong-Hyuck;Baek, Je-Hyun
    • Proceedings of the KSME Conference
    • /
    • 2003.11a
    • /
    • pp.910-915
    • /
    • 2003
  • A Navier-Stokes equation solver for incompressible viscous flows with free surface is developed and tested. This is based upon a fractional time step method and a non-staggered finite volume formulation for unstructured meshes. For time advancement scheme, Adams -Bashforth method for convective term and Crank-Nicolson method for diffusive term are applied. The interface between two fluids with different fluid properties is tracked with Piecewise Linear Interface Calculation(PLIC) Volume-of-Fluid(VOF) methods. Computational results are presented for some test problems: the broken dam, the sloshing in a rectangular tank, the filling of a cylindrical tank.

  • PDF

Analysis of natural convection-radiation heat transfer using the finite volume method in enclosure (유한체적법을 이용한 밀폐공간내의 자연대류-복사열전달 해석)

  • 박광수;박경우;박희용
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
    • /
    • v.10 no.1
    • /
    • pp.95-107
    • /
    • 1998
  • Natural convection and radiation heat transfer in a square enclosure containing absorbing, emitting, and isotopically scattering(participating) media is studied numerically using the finite volume method. Various numerical methods are employed to analyze the radiative heat transfer. However, it is very difficult to choose the proper method. In present study, a finite volume method(FVM) and a discrete ordinates method(DOM) are compared in rectangular enclosure. The SIMPLER algorithm is used to solve the momentum and energy equations. Thermal and flow characteristics are investigated according to the variation of radiation parameters such as optical thickness and scattering albedo. The result shows that the accuracy and the computing time of FVM are better than those of DOM in regular geometry.

  • PDF

Depth Averaged Numerical Model for Sediment Transport by Transcritical Flows (급변류에 의한 하상변동 예측을 위한 수심적분 수치모형)

  • Kim, Boram;Kim, Dae-Hong
    • Journal of Korea Water Resources Association
    • /
    • v.47 no.11
    • /
    • pp.1061-1066
    • /
    • 2014
  • A stable second-order finite volume method was proposed to predict sediment transport under rapidly varied flow conditions such as transcritical flow. For the use under unsteady flow conditions, a sediment transport model was coupled with shallow water equations. HLLC approximate Riemann solver based on a monotone upstream-centered schemes for conservation laws (MUSCL) reconstruction was used for the computation of the flux terms. From the comparisons of dam break flow experiments on erodible beds in one- and two-dimensional channels, good agreements were obtained when proper parameters were provided. Lastly, dam surface erosion problem by overtopped water was simulated. Overall, the numerical solutions showed reasonable results, which demonstrated that the proposed numerical scheme could provide stable and physical results in the cases of subcritical and supercritical flow conditions.

2차원 비점성 천음속 익렬 유동에 대한 수치해석적 연구

  • 이영창;유정열
    • Transactions of the Korean Society of Mechanical Engineers
    • /
    • v.14 no.4
    • /
    • pp.981-989
    • /
    • 1990
  • 본 연구에서는 유한체적법에 의한 4단계 Runge-Kutta방법으로 2차원 익열에 대한 비점성 천음속 유동장에 대한 해석을 수행하기로 하는데 이는 경계층방정식에 대 한 경계조건으로 이용될 수 있고 3차원 계산시 그 기초자료가 될 수 있을 것이다.

Numerical Simulation of Turbulent Flows in Inlet Duct of Heat Recovery Steam Generator (배열회수 안내덕트 내부의 난류유동 수치시뮬레이션)

  • Kwag, Seung-Hyun
    • Journal of Advanced Marine Engineering and Technology
    • /
    • v.35 no.6
    • /
    • pp.809-813
    • /
    • 2011
  • Turbulent flows are numerically simulated in the three dimensional inlet duct for heat recovery steam generator. The present study is aimed to analyze the effect of a variation in turbulent flow pattern by the change of roof angle in the transition duct. The finite volume based Navier-Stokes equations with unstructured grids are solved to make clear the flow dynamic phenomena. Reviews are made on with the data of path lines, velocity vectors, dynamic pressure, residuals for numerical convergence and so on. The k-epsilon, k-omega, Reynolds stress and RNG k-epsilon are used for generation of turbulence. Two types of roof angle are applied with and without the swirl in the duct. Turbulent flow patterns could be investigated for the optimum duct design based on the computational results.

Numerical Simulations of Flood Inundations with FLUMEN (FLUMEN 모형을 이용한 홍수범람모의)

  • Bae, Yong-Hoon;Koh, Deuk-Koo;Cho, Yong-Sik
    • Journal of Korea Water Resources Association
    • /
    • v.38 no.5 s.154
    • /
    • pp.355-364
    • /
    • 2005
  • In this study, flood inundations have been simulated by using the numerical model FLUMEN solving the shallow-water equations with a finite volume method. Before applying to a real problem, the numerical model is first applied to simplified problems. Obtained numerical results are verified by comparing with available analytical solutions and laboratory measurements. Reasonable agreements are observed. The model is then applied to a simulation of flood events with real geometries. The results of this study will provide basic information to make a flood inundation map.