10:30 AM–12:40 PM, Sunday, November 23, 2008
- 202B
Chair: Xiaolong Yin, Colorado School of Mines
Abstract ID: BAPS.2008.DFD.BQ.7
11:48 AM–12:01 PM
Francesco Lucci
(University of California, Irvine)
Antonino Ferrante
(California Institute of Technology)
Said Elghobashi
(University of California, Irvine)
Our DNS study concerns the interactions between decaying isotropic turbulence and solid spherical particles with diameter, $d$, larger than the Kolmogorov length scale, $\eta$. We employ an Immersed Boundary method similar to that of Uhlmann (JCP, 2005) to resolve the flow around $6400$ spherical particles with a volume fraction of $\phi_v=0.1$. The monosize particles have a diameter, $d = 16 \eta_o$. Our simulations, with $256^3$ mesh points and $Re_{\lambda_0} = 75$, cover a range of $38 \le \tau_p/\tau_{K_o} \le 149$, for the ratio of the particle response time to the initial Kolmogorov time scale. A Lagrangian approach is used to compute the frequency spectrum of the turbulence kinetic energy (TKE) of the fluid phase. The effects of varying $\tau_p/\tau_{K_o}$ on the spectrum and the decay rate of TKE are discussed. The effects of the formation of the particle boundary layer on the viscous dissipation rate of TKE are also discussed.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2008.DFD.BQ.7