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가상 경계 유한 차분 격자 볼츠만 법을 이용한 2 차원 열유동에 관한 수치적 연구
양희주(Hui-Ju Yang),정해권(Hae-Kwon Jeong),김래성(Lae-Sung Kim),하만영(Man-Yeong Ha) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
In this paper, we performed thermal applications to implementing Immersed boundary in the Finite difference lattice Boltzmann method. The immersed boundary method uses the Lagrangian grid which represents the particles in the flow, whereas the lattice Boltzmann method is based on Eulerian grid. For a consideration of the coupling the immersed boundary method and the finite difference lattice Boltzmann equation, we used an equilibrium velocity scheme. The coupling method which many researchers used is not easy to apply the thermal application using the finite difference lattice Boltzmann method. However when the equilibrium velocity scheme is adopted, the thermal problem can be easily treated using a double population method. The results of the numerical simulations of a flow around a circular cylinder agreed well with benchmark data.
차분격자 볼츠만법에 의한 충돌제트 유동특성의 수치적 연구
양희주(Hui-Ju Yang),정해권(Hae-Kwon Jeong),김래성(Lae-Sung Kim),김두현(Doo-Hyun Kim),하만영(Man-Yeong Ha) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
This study investigates two-dimensional slot confmed jet impinging above the flat plate using the finite difference lattice Boltzmann method(FDLBM). The convection term is discreted by the third-order-accurate up-wind scheme, and the time-marching is discreted by the second order-accurate runge-kutta scheme. The jet Reynolds number is varied from Re=125 to 625 for a low Mach number and a fixed jet-to-plate spacing of H/D=5. We can observe the flow pattern's change for various Reynolds number.
가상경계 유한차분 격자 볼츠만 법을 이용한 평판근처 원형 실린더 주위의 비압축성 유동에 관한 수치적 연구
양희주(Hui-Ju Yang),정해권(Hae-Kwon Jeong),김래성(Lae-Sung Kim),하만영(Man-Yeong Ha) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
In this paper, incompressible flow over a cylinder near a plane wall using the Immersed Boundary ? Finite Difference Lattice Boltzmann Method (IB-FDLBM) is implemented. In this present method, FDLBM is mixed with IBM by using the equilibrium velocity. We introduce IBM so that we can easy to simulate bluffbodies. With this numerical procedure, the flow past a circular cylinder near a wall is simulated. We calculated the flow patterns about various Reynolds numbers and gap ratios between a circular cylinder and plane wall. So these are enabled to observe for vortex shedding. The numerical results are found to be in good agreement with those of previous studies.
가상경계 격자 볼츠만법을 이용한 사각 캐비티 내부 열유동 해석에 관한 전산 해석
정해권(Hae-Kwon Jeong),김래성(Las-Sung Kim),김두현(Doo-Hyun Kim),양희주(Hui-Ju Yang),하만영(Man-Yeong, Ha) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
In this paper, we propose a new approach to implementing Immersed-Boundary in the lattice Boltzmann method. We adapt the Immersed-Boundary to the thermal lattice Boltzmann method using an equilibrium velocity. This model does not have additional external force term when we calculate the collision process and is much easier to be implemented. This model is validated by the numerical simulation of the natural convection and lid-driven flow in a square cavity with a cylinder.
가상경계 유한차분 볼츠만법을 통한 2 차원 원형 실린더 주위 유동에 관한 수치적 연구
김두현(Doo-Hyun Kim),정해권(Hae-Kwon Jeong),김래성(Lae-Sung Kim),양희주(Hui-Ju Yang),하만영(Man-Yeong Ha) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
This paper presents a 2-D numerical simulation of fluid flow around a cylinder using immersed boundaryfinite difference lattice Boltzmann method(IB-FDLBM). This method is a combination and utilizes the most desirable feature of the finite difference lattice Boltzmann method and the immersed boundary method. The FDLBM uses a Eulerian grid for the flow domain and the immersed boundary is represented with a finite number of Lagrangian points. Bluff body wake interference and its effect on drag and lift force are studied. The drag and lift coefficient are compared with previous experimental and numerical results for various Reynolds number.