Direct and large eddy simulation of stratified turbulence

Sebastian Remmler, Stefan Hickel

Research output: Contribution to journalArticleScientificpeer-review

27 Citations (Scopus)

Abstract

Simulations of geophysical turbulent flows require a robust and accurate subgrid-scale turbulence modeling. To evaluate turbulence models for stably stratified flows, we performed direct numerical simulations (DNSs) of the transition of the three-dimensional Taylor-Green vortex and of homogeneous stratified turbulence with large-scale horizontal forcing. In these simulations we found that energy dissipation is concentrated within thin layers of horizontal tagliatelle-like vortex sheets between large pancake-like structures. We propose a new implicit subgrid-scale model for stratified fluids, based on the Adaptive Local Deconvolution Method (ALDM). Our analysis proves that the implicit turbulence model ALDM correctly predicts the turbulence energy budget and the energy spectra of stratified turbulence, even though dissipative structures are not resolved on the computational grid.

Original languageEnglish
Pages (from-to)13-24
Number of pages12
JournalInternational Journal of Heat and Fluid Flow
Volume35
DOIs
Publication statusPublished - 1 Jun 2012
Externally publishedYes

Keywords

  • Boussinesq equations
  • Direct numerical simulation
  • Large eddy simulation
  • Stratified turbulence
  • Taylor-Green vortex

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