Can I read Resolution Effects and Scaling in Numerical Simulations of Passive Scalar Mixing in Turbulence on EtoBox?

Resolution Effects and Scaling in Numerical Simulations of Passive Scalar Mixing in Turbulence by D.A. Donzis; P.K. Yeung is a Physics and Astronomy article available to read on EtoBox.

What is Resolution Effects and Scaling in Numerical Simulations of Passive Scalar Mixing in Turbulence about?

The effects of finite grid resolution on the statistics of small scales in direct numerical simulations of turbulent mixing of passive scalars are addressed in this paper. Simulations at up to 2048 3 grid points with grid spacing ∆x varied from about 2 to 1/2 Batchelor scales (η B ) show that most conclusions on Schmidt number (Sc) dependence from prior work at less stringent resolution remain qualitatively correct, although simulations at resolution ∆x ≈ η B are preferred and will give adequate results for many important quantities including the scalar dissipation intermittency exponent and structure functions at moderately high orders. For Sc ≥ 1, since η B = ηSc -1/2 (where η is the Kolmogorov scale), the requirement ∆x ≈ η B is more stringent than the corresponding criterion ∆x ≈ η for the velocity field, which is thus well resolved in simulations aimed at high Schmidt number mixing. A simple argument is given to help interpret the effects of Schmidt and Reynolds numbers on trends towards local isotropy and saturation of intermittency at high Schmidt number. The present results also provide evidence for a trend to isotropy at high Reynolds number with fixed Sc = 1.0. This is a

Who reads Resolution Effects and Scaling in Numerical Simulations of Passive Scalar Mixing in Turbulence?

Author

D.A. Donzis; P.K. Yeung

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0167-2789)

Published

2010

Language

EN

Field

Physics and Astronomy (Physical Sciences)