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ALE 모델의 래티스볼츠만 스킴에의 적용 : 회전하는 타원체로부터 유기되는 유동소음 해석
최종웅(J.W Choi),강호근(H.K. Kang),안수환(S.W. Ahn),김정환(J.W. Kim) 한국항해항만학회 2008 한국항해항만학회 학술대회논문집 Vol.2008 No.공동학술
Numerical solutions are presented for compressible fluid flow past a rotating elliptic cylinder in a medium at rest at infinity. Flowfields and acoustic waves emitted from rotating elliptic cylinder are directly simulated by the lattice Boltzmann method formulated by the arbitrary Lagrangian Eulerian scheme. The flowfield is almost periodic after the calculation fully developed and studied by means of streamlines and equi-vorticity lines and by means of drag, lift and moment coefficients. The numerical analysis produce typical flows such that the large vortexes appear at the outside of the elliptic cylinder, and move slowly to the same direction as the cylinder's rotation. The positive and negative vorticity is alternately occurred at the edge by those large vortexes. The acoustic waves propagate synchronizing with the rotation and increase with M3.5 of rotational speed of elliptic cylinder.
침전지의 유동 특성과 Lagrangian Method를 이용한 침전효율 예측에 관한 연구
최종웅(Jong-Woong Choi),홍성택(Sung-Taek Hong),김성수(Seong-Su Kim),김연권(Youn-Kwon Kim),박노석(No-Suk Park) 大韓環境工學會 2017 대한환경공학회지 Vol.39 No.5
국내에서 설치 운영 중인 D정수장의 장방형 침전지를 대상으로 설계유량(15,864 m<SUP>3</SUP>/day)과 운영유량(33,333 m<SUP>3</SUP>/day))에 대하여 CFD 해석 방법을 사용하여 침전지의 유동특성 및 tracer 모의를 수행하였으며, 침전지의 유입부로 유입되는 플럭을 입자로 가정하여 모사하는 Lagrangin 기법을 적용하여 침전지의 효율을 검토하였다. 그 결과 침전지내 흐름을 plug flow영역으로 만들기 위한 평균 속도값을 0.00193 m/s, 0.00417 m/s로 도출되었다. 또한 각 유량 조건에 대해 Tracer test를 모의한 결과 β(유효접촉인자) 값은 각각 0.51, 0.46, Morrill Index값은 각각 6.05와 3.21, 단락류 Index는 0.54와 0.34로 나타났다. Flow characteristics analysis and tracer test simulations for the rectangular typed sedimentation basins, which have been operated at D_water treatment plant in Korea, were carried out using CFD (Computational Fluid Dynamics) techniques for design (15,864 m<SUP>3</SUP>/day) and operation flowrate (33,333 m<SUP>3</SUP>/day). Also, each efficiency of the sedimentation basin was evaluated by application of the Lagrangin technique on the assumption of the particles flowing into the inlet of the sedimentation basin. From the results of simulation, the mean velocity values for making the flow in the settling basin as a plug flow region were derived as 0.00193 m/s and 0.00417 m/s, respectively. In addition, β (effective contact factor) values were calculated to be 0.51 and 0.46, and the Morrill Index values were 6.05 and 3.21, respectively for both flowrate conditions.
최종웅(J.W Choi),강호근(H.K. Kang),안수환(S. W. Ahn),김정환(J.W. Kim) 한국마린엔지니어링학회 2008 한국마린엔지니어링학회 학술대회 논문집 Vol.2008 No.-
Numerical solutions are presented for compressible fluid flow past a rotating elliptic cylinder in a medium at rest at infinity. Flowfields and acoustic waves emitted from rotating elliptic cylinder are directly simulated by the lattice Boltzmann method formulated by the arbitrary Lagrangian Eulerian scheme. The flowfield is almost periodic after the calculation fully developed and studied by means of streamlines and equi-vorticity lines and by means of drag, lift and moment coefficients. The numerical analysis produce typical flows such that the large vortexes appear at the outside of the elliptic cylinder, and move slowly to the same direction as the cylinder's rotation. The positive and negative vorticity is alternately occurred at the edge by those large vortexes. The acoustic waves propagate synchronizing with the rotation and increase with M<SUP>3.5</SUP> of rotational speed of elliptic cylinder.