Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Fluid Dynamics
Volume 56, Number 18
Sunday–Tuesday, November 20–22, 2011; Baltimore, Maryland
Session H13: Multiphase Flow IV: Numerical I
10:30 AM–12:40 PM,
Monday, November 21, 2011
Chair: Olivier Desjardins, Cornell University
Abstract ID: BAPS.2011.DFD.H13.2
Abstract: H13.00002 : A multilevel simulation approach to derive the slip boundary condition of the solid phase in two-fluid models*
10:43 AM–10:56 AM
Preview Abstract Abstract
(University of Texas at San Antonio)
(Los Alamos National Laboratory)
The simulation of particulate flows for industrial applications often requires the use of a two-fluid model (TFM), where the solid particles are considered as a separate continuous phase. One of the underlining uncertainties in the use of aTFM in multiphase computations comes from the boundary condition of the solid phase. The no-slip condition at a solid boundary is not a valid assumption for the solid phase. Instead, several researchers advocate a slip condition as a more appropriate boundary condition. However, the question on the selection of an exact slip length or a slip velocity coefficient is still unanswered. In the present work we propose a multilevel simulation approach to compute the slip length that is applicable to a TFM. We investigate the motion of a number of particles near a vertical solid wall, while the particles are in fluidization using a direct numerical simulation (DNS); the positions and velocities of the particles are being tracked and analyzed at each time step. It is found that the time- and vertical-space averaged values of the particle velocities converge, yielding velocity profiles that can be used to deduce the particle slip length close to a solid wall.
*This work was supported by a grant from the DOE-NETL (DE-NT0008064) and by a grant from NSF (HRD-0932339).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.DFD.H13.2
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