자유 낙하하는 사각 실린더 주위의 유동 구조
Flow Structures Around a Freely-falling, Rectangular Cylinder
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
The flow around a two-dimensional, rectangular cylinder that is freely falling in a channel was simulated using the immersed boundary method with direct forcing to determine the interactions between the fluid and the structure. The results of the present study were in good agreement with previous experimental results. Regardless of the H/L ratio (where H and L are the height and width of the rectangular cylinder, respectively), the flow structures had essentially the same pattern as the two symmetrical circulations that form about the horizontal center of the cylinder, with those centers located at each lateral position near the wake. When the cylinder approaches very close to the bottom, a jet-like flow appeared between the bottom of the rectangular cylinder and the channel. When the jet-like flow goes through the channel, surrounding fluids are sucked into this jet, forming the secondary vortices.
Abstract
The flow around a two-dimensional, rectangular cylinder that is freely falling in a channel was simulated using the immersed boundary method with direct forcing to determine the interactions between the fluid and the structure. The results of the present study were in good agreement with previous experimental results. Regardless of the H/L ratio (where H and L are the height and width of the rectangular cylinder, respectively), the flow structures had essentially the same pattern as the two symmetrical circulations that form about the horizontal center of the cylinder, with those centers located at each lateral position near the wake. When the cylinder approaches very close to the bottom, a jet-like flow appeared between the bottom of the rectangular cylinder and the channel. When the jet-like flow goes through the channel, surrounding fluids are sucked into this jet, forming the secondary vortices.
참고문헌 (12)
- Feng, Z, "Proteus: A Direct Forcing Method in the Simulations of Particulate Flows", J. Comput. Phys, 202, pp.20~51 (2005)
- Glowinski, R, "A Distributed Lagrange Multiplier", Fictitious Domain Method for Particulate Flows, 1999, pp.25, 755~794
- Glowinski, R, "A Fictitious Domain Approach to the Direct Numerical Simulation of Incompressible Viscous Flow Past Moving Rigid Bodies: Application to Particulate Flow", J. Comp. Phys, 169, pp.363~426 (2001)
- Haider, A, "Drag Coefficient and Terminal Veolocity of Spherical and Nonspherical Rarticles", Power Technol, 58, pp.63~70 (1989)
- Höfler, K, "Navier-Stokes Simulation with Constraint Forces: Finite-difference Method for Particle, Laden Flows and Complex Geometries", Phys. Rev. E, 61(6), pp.7146~7160 (2000)
- Kim, J, "Application of a Fractional-step Method to Incompressible Navier-stokes Equations", J. Comput. Phys, 59, pp.308~323 (1985)
- Roma, A, "An Adaptive Version of the Immersed Boundary Method", J. Comput. Phys, 153, pp.15~53 (1999)
- Uhlmann,M, "An Immersed Boundary Method with Direct Forcing for the Simulation of Particulate Flows", J. Comp. Phys, 209, pp.448~476 (2005)
- Yu, Z, "A Fictitious Domain Method for Particulate Flows with Heat Transfer", J. Comput. Phys., 217, pp.424~452 (2006)
- Yu, Z, "Numerical Simulation of Particle Sedimentation in Shear-thinning Fluids with a Fictitious Domain Method", J. Non- Newtonian Fluid Mech, 136, pp.126~139 (2006)
- Wachs,A, "A DEM-DLM", FD Method for Direct Numerical Simulation of Particulate Flows:Sedimentation of Polygonal Isometric Particle in a Newtonian Fluid with Collisions, 2009, pp.38, 1608~1628
- Zang, Y, "A Nonstaggered Grid, Fractional Step Method for Time- Dependent Incompressible Navier-Stokes Equations in Curvilinear Coordinate", J. comput. Phys, 114, pp.18~33 (1994)