Finite-size effects in the dynamics of neutrally buoyant particles in turbulent flow - Physics > Fluid DynamicsReport as inadecuate




Finite-size effects in the dynamics of neutrally buoyant particles in turbulent flow - Physics > Fluid Dynamics - Download this document for free, or read online. Document in PDF available to download.

Abstract: The dynamics of neutrally buoyant particles transported by a turbulent flowis investigated for spherical particles with radii of the order of theKolmogorov dissipative scale or larger. The pseudo-penalisation spectral methodthat has been proposed by Pasquetti et al. 2008 is adapted to integratenumerically the simultaneous dynamics of the particle and of the fluid. Such amethod gives a unique handle on the limit of validity of point-particleapproximations, which are generally used in applicative situations. Analyticalpredictions based on such models are compared to result of very well resolveddirect numerical simulations. Evidence is obtained that Faxen corrections givedominant finite-size corrections to velocity and acceleration fluctuations forparticle diameters up to four times the Kolmogorov scale. The dynamics ofparticles with larger diameters is dominated by inertial-range physics, and isconsistent with predictions obtained from dimensional analysis.



Author: Holger Homann, Jeremie Bec

Source: https://arxiv.org/







Related documents