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- Title
Spectral structure of stratified turbulence: direct numerical simulations and predictions by large eddy simulation.
- Authors
Remmler, Sebastian; Hickel, Stefan
- Abstract
Density stratification has a strong impact on turbulence in geophysical flows. Stratification changes the spatial turbulence spectrum and the energy transport and conversion within the spectrum. We analyze these effects based on a series of direct numerical simulations (DNS) of stratified turbulence. To facilitate simulations of real-world problems, which are usually beyond the reach of DNS, we propose a subgrid-scale turbulence model for large eddy simulations of stratified flows based on the Adaptive Local Deconvolution Method (ALDM). Flow spectra and integral quantities predicted by ALDM are in excellent agreement with direct numerical simulation. ALDM automatically adapts to strongly anisotropic turbulence and is thus a suitable tool for studying turbulent flow phenomena in atmosphere and ocean.
- Subjects
TURBULENCE; COMPUTER simulation; PROPHECY; DENSITY; ANISOTROPIC crystals
- Publication
Theoretical & Computational Fluid Dynamics, 2013, Vol 27, Issue 3/4, p319
- ISSN
0935-4964
- Publication type
Article
- DOI
10.1007/s00162-012-0259-9