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L-형 파이프 내 볼밸브 유동에 대한 RANS와 LES 수치해석
배기화(K.H. Bae),허형석(H.S. Heo),강상모(S.M. Kang) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.10
Numerical simulations are performed using RANS and LES on flow through a ball valve for L-shaped pipe. Turbulence models adopted for RANS and LES simulations are k-ε model, Sear Stress Transport(SST) model and LES model. The water with 5000 is exerimentally studied by CFX which is useful simulater in flow. Result of simulations are compared with each other model, that is k-ε, SST and LES, in pressure. There's some diffrence between RANS model and LES. LES model has more thaw pressure result.
버터플라이 밸브를 통과하는 압축성 유동에 대한 실험 및 수치해석적 연구
황규식(K.S. Hwang),장문석(M.S. Chang),홍진표(J.P. Hong),허형석(H.S. Heo) 한국전산유체공학회 2007 한국전산유체공학회 학술대회논문집 Vol.2007 No.-
Compressible flow characteristics in a butterfly valve is studied experimentally and numerically. The disk angle of the valve is changed as 0°~30°. The SST model is used to represent the turbulent effect in the commercial code, CFXll. It was found that the numerical results are similar to the experimental ones, general discussions are given to the pressure distributions upon the disk angle of the valve.
HCCI 엔진 부실내 소기특성에 대한 이론 및 수치해석적 연구
서용권(Y.K. Suh),허형석(H.S. Heo) 한국전산유체공학회 2005 한국전산유체공학회지 Vol.10 No.2
In this paper, we present the theoretical and numerical results of scavenge characteristics in a small subchamber of an HCCI(Homogeneous Charge Compression Ignition) engine. Two theoretical models are proposed in prediction of the scavenge time and the efficiency; one is the non-mixing model in which the input gas(CH4) and the existing gas(air) do not mix at all, and the other is the fully-mixed model in which the two gases are assumed to mix completely before ejection. Focus is also given to the effect on the scavenge performance of the size of the chamber outlet.
마이크로 채널 내 사다리꼴 전극의 제타 포텐셜 변화에 따른 혼합효과 증대에 대한 수치해석적 연구
서용권(Y.K. Suh),허형석(H.S. Heo),康金芬(J.F. Kang) 한국전산유체공학회 2006 한국전산유체공학회지 Vol.11 No.3
This paper presents the numerical results of fluid flow and mixing in a micro fluidic device for electro-osmotic flow (EOF) with an trapezoidal electrode array on the bottom wall (ETZEA). Differently from previous EOF in a channel which only transports fluid in colloidal system, E1ZEA can also be utilized to mix a target liquid with a reagent. In this study we propose a method of controlling fluid flow and mixing enhancement. To obtain the flow and mixing characteristics, numerical computations are performed by using a commercial code, CFX-10, and a self-made code LBM-D. It was found that the flow near the trapezoidal electrode in the ETZEA is of 3-D complex flows due to the zeta potential difference between the trapezoidal electrode and channel walls, and as a consequence the hetrogeneous zeta potential on the electrodes plays an important role in mixing the liquid.
서용권(Y.K. Suh),강상모(S.M. Kang),허형석(H.S. Heo) 한국전산유체공학회 2006 한국전산유체공학회지 Vol.11 No.2
In the present, The theoretical and numerical results of gas flow characteristics inside a swirl injector are presented. For this purpose a one-dimensional (theoretical) model and 2D/3D CFD models are proposed for use in the design of the injector. It was found that contradictory to the classical theory about the compressible flow, the swirl has a significant effect on the mass flow rate and the choking conditions. It was found that the one-dimensional model provides reasonably accurate results compared with the 2D/3D numerical results, and thus can be used at the initial stage of the swirl-injector design process.