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기체 흐름에 고체입자가 섞인 파이프 내의 이상유동에 대한 수치해석
박순일(S. I. Pak),장근식(K. S. Chang) 한국전산유체공학회 2002 한국전산유체공학회 학술대회논문집 Vol.2002 No.-
A numerical simulation was made to determine the motion of particles in the fluid. The simulation is based on the Eulerian-Lagrangian method. The fluid motion was solved using a PISO-based finite-element method and a k-ε model of turbulence. In the Lagrangian method for the solid phase, the trajectories of particles are calculated by integrating the equations of motion of a single particle, and the collision between particles are taken into account. The influence of particles on the fluid phase is taken into account by introducing source terms in the Eulerian equations govering the fluid flow. It is known as the particle-source-in-cell (PSIC) method. Also, the turbulent effect in the particles and fluid motion is considered. The numerical results were compared with the experiment for a two-phase flow in a vertical pipe.
2-방정식 난류모델을 이용한 스포일러 천이적 공력특성의 파라메트릭 연구
최성욱(S. W. Choi),장근식(K. S. Chang),옥호남(H. N. Ok) 한국전산유체공학회 2000 한국전산유체공학회 학술대회논문집 Vol.2000 No.10
The transient response of an airfoil to a rapidly deploying spoiler is numerically investigated using the turbulent compressible Navier-Stokes equations in two dimensions. Algebraic Baldwin-Lomax model, Wilcox k- ω model, and SST k- ω turbulence model are used to calculate the unsteady separated flow due to the rapid spoiler deployment. The spoiler motion relative to a stationary airfoil is treated by an overset grid bounded by a Dynamic Domain-Dividing Line which has been devised by the authors. The adverse effects of the spoiler influenced by the spoiler location and the hinge gap are expounded. The numerical results are in reasonably good agreement with the existing experimental data.
다중 블록 격자를 이용한 원뿔 직관 모양의 벌류트 유동의 수치해석
배황(H. Bae),강현구(H.G. Kang),윤주식(J.S. Yoon),박기철(K.C. Park),장근식(K.S. Chang) 한국전산유체공학회 2006 한국전산유체공학회지 Vol.11 No.1
Numerical investigation of a centrifugal compressor volute having a modified straight conical duct has been made. Three-dimensional Reynolds-Averaged Navier-Stokes equations with k-ε turbulence equation are solved To avoid coordinate singularity at the central axis of the duct, multi-block H-type grid is generated on the circular cross-sections of the volute and stretched toward the solid wall boundary. We obtained numerical results with three different mass flow rates at the volute inlet, namely, with the inlet conditions that give small, medium and large mass flow rates at the outlet of the conical duct. Agreement with the experimental results is observed.
최성욱(S. W. Choi),장근식(K. S. Chang) 한국전산유체공학회 2000 한국전산유체공학회 학술대회논문집 Vol.2000 No.5
Transient aerodynamic response of an airfoil to a rapidly deploying spoiler is numerically investigated using a two-dimensional turbulent compressible Navier-Stokes flow model. The spoiler moving relative to a stationary airfoil is treated by an overset grid bounded by a 'dynamic domain-dividing line' the concept of which is developed first in this paper. The fluid-dynamic mechanism of the adverse lift due to the rapidly deploying spoiler is analyzed. Also the effect of spoiler deploying rate on the initial behavior of the aerodynamic response is expounded, which is of interest in view of active control technology and controller design for the spoiler. The results of present computation about the stationary as well as moving spoilers are relatively in good agreement with the existing experimental data.
벤츄리 스크러버 내의 액체 분사 미립화에 대한 수치적 해석
박순일(S. I. Pak),장근식(K. S. Chang),문윤완(Y. W. Moon),사종엽(J. Y. Sah) 한국전산유체공학회 2004 한국전산유체공학회 학술대회논문집 Vol.2004 No.-
Liquid injection in a Venturi Scrubber creates great effect on the dust-collection efficiency and operation cost of venturi scrubbers. We have developed a model that can numerically simulate atomization of the liquid jet in the Venturi Scrubber. This simulation consists of models on liquid column, jet surface breakup, column fracture and secondary droplet breakup. These models have been embedded in the KIVA3-V code. We have calculated such parameters as the jet penetration, jet trajectory, droplet size, velocity field and the volume flux distribution. The results are compared with the experimental data in this paper.
오일러-라그랑지 방법을 이용한 벤튜리 스크라버의 압력강하 계산
박순일(S. I. Pak),장근식(Y. W. Moon),문윤완(K. S. Chang) 한국전산유체공학회 2004 한국전산유체공학회 학술대회논문집 Vol.2004 No.-
The pressure drop in a Venturi Scrubber is predicted using the Eulerian-Lagrangian Method, which is one of the numerical methods to solve the dispersed two-phase flow. KIVA-3V Code is modified to solve the coupled gas-liquid two-phase flow field. The liquid is assumed to be injected through the nozzles with the Rosin-Rammler drop size distribution. The computational results shows good agreement with the experimental data.