Numerical investigation of stratified turbulence

S. Remmler, S. Hickel

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

Abstract

In order to evaluate turbulence subgrid-scale models for stably stratified flows, we performed direct numerical simulations (DNS) 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. For large eddy simulation (LES), we use an implicit subgrid-scale model, 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
Title of host publicationHigh Performance Computing in Science and Engineering 2012 - Transactions of the High Performance Computing Center, Stuttgart, HLRS 2012
Pages415-430
Number of pages16
DOIs
Publication statusPublished - 2 Sep 2013
Externally publishedYes
Event15th Results and Review Workshop on High Performance Computing in Science and Engineering, HLRS 2012 - Stuttgart, Germany
Duration: 10 Oct 201211 Oct 2012

Conference

Conference15th Results and Review Workshop on High Performance Computing in Science and Engineering, HLRS 2012
CountryGermany
CityStuttgart
Period10/10/1211/10/12

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