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INTRODUCTION TO UNSTRUCTURED HYBRID MESH BASED FLOW SIMULATION TECHNIQUE
H.T. Ahn(안형택) 한국전산유체공학회 2009 한국전산유체공학회 학술대회논문집 Vol.2009 No.4
In this paper, flow simulation algorithms for utilizing unstructured hybrid meshes are introduced. First, various types of meshes are introduced. Advantages and disadvantages of each type of meshes are discussed. Unstructured hybrid mesh approach, that is best suited for high speed viscous flow simulation, is presented. Lastly. various types of flow simulations using unstructured hybrid meshes are introduced.
비정렬 격자상에서 Moment-of-Fluid 방법을 이용한 자유표면유동계산
안형택(H.T. Ahn) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.5
The moment-of-fluid (MOF) method is a new volume-tracking method that accurately treats evolving material interfaces. The MOF method uses moment data, namely the material volume fraction, as well as the centroid, for a more accurate representation of the material configuration, interfaces and concomitant volume advection. In this paper, unstructured mesh extension of the MOF method is to be presented. The MOF method is coupled with a stabilized finite element incompressible Navier-Stokes solver for two materials. The effectiveness of the MOF method is demonstrated with a free-surface dam-break problem.
안형택(H.T. Ahn),Yousef Ghaffari Motlagh,Thomas J.R. Hughes 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
Variational multiscale(VMS) simulation of laminar flow around a circular cylinder is presented. VMS formulation is employed for simulating flows around a bluff body, namely circular cylinder. Isogeometric analysis(IGA) techinque, an enhanced Finite Element Method using the quadratic NURBS basis functions, is employed for the exact representation of the circular geometry of the cylinder as well as higher order (>2nd) and C<SUP>1</SUP> continuous approximation of the solution.
FREE SURFACE FLOW COMPUTATION USING MOMENT-OF-FLUID AND STABILIZED FINITE ELEMENT METHOD
H.T. Ahn(안형택) 한국전산유체공학회 2009 한국전산유체공학회 학술대회논문집 Vol.2009 No.11
The moment-of fluid (MOF) method is a new volume-tracking method that accurately treats evolving material interlaces. Based on the moment data (volume and centroid) for each material, the material interfaces are reconstructed with second-order spatial accuracy in a strictly conservative manner. The MOF method is coupled with a stabilized finite element incompressible Navier-Stokes solver for two fluids, namely water and air. The effectiveness of the MOF method is demonstrated with a free-surface dam-break problem.
김세훈(S.H. Kim),안형택(H.T. Ahn),유정수(J.S. Ryue),신현경(H.K. Shin),권오조(O.J. Kwon),서희선(H.S. Seo) 한국전산유체공학회 2012 한국전산유체공학회지 Vol.17 No.1
Fluid-Structure Interaction analysis of a circular cylinder surrounded by incompressible turbulent flow is presented. The fluid flow is modeled by incompressible Navier-Stokes equations in conjunction with large-eddy simulation for turbulent vortical flows. The circular cylinder is modeled as elastic continuum described by elasto-dynamic equation of motion. Finite element method based approach is utilized for unified formulation of fluid-structure interaction analysis. The magnitude and frequency of structural response is analysed in comparison to the driving fluid forces.
홍환의(H.E. Hong),안형택(H.T. Ahn),명훈주(H.J. Myung) 한국전산유체공학회 2012 한국전산유체공학회지 Vol.17 No.2
This paper presents incompressible Navier-Stokes solution algorithm for 2D Free-surface flow problems on the Cartesian mesh, which was implemented to run on Graphics Processing Units(GPU). The INS solver utilizes the variable arrangement on the Cartesian mesh, Finite Volume discretization along Constrained Interpolation Profile-Conservative Semi-Lagrangian(CIP-CSL). Solution procedure of incompressible Navier-Stokes equations for free-surface flow takes considerable amount of computation time and memory space even in modern multi-core computing architecture based on Central Processing Units(CPUs). By the recent development of computer architecture technology, Graphics Processing Unit(GPU)’s scientific computing performance outperforms that of CPU’s. This paper focus on the utilization of GPU’s high performance computing capability, and presents an efficient solution algorithm for free surface flow simulation. The performance of the GPU implementations with double precision accuracy is compared to that of the CPU code using an representative free-surface flow problem, namely. dam-break problem.
홍환의(H.E. Hong),안형택(H.T. AHN),명훈주(H.J. MYUNG) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.11
This paper presents Incompressible Naver-Stokes (INS) Solver for 2D Free-surface flow problems on the Cartesian mesh, which was implemented to run on Graphics Processing Units (GPU). The INS solver uses the variable arrangement on the Cartesian mesh, Finite Volume Method (FVM) along Constrained Interpolation Profile-Conservative Semi-Lagrangian (CIP-CSL). Solution procedure of incompressible Navier-Stokes equation for free-surface flow takes tremendous amount of Central Processing Unit (CPU) time and memory even in modern multi-core computing architecture based on CPUs. As development of computer architecture technology, Graphics Processing Unit (GPU)s scientific computing performance outperforms that of CPUs. This paper focus on the utilization of GPUs high performance computing capability, and present an efficient solution of free surface flow simulation. The performance of the GPU implementations with double precision is compared to that of the CPU code using an representative free-surface flow problem, e.g. dam-break problem.