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Subgrid scale modelling of Relaminarization Effects in a differentially heated channel

Wetzel, Tim and Wagner, Claus (2016) Subgrid scale modelling of Relaminarization Effects in a differentially heated channel. 20. DGLR-Fachsymposium der STAB, 08.-09- Nov. 2016, Braunschweig, Deutschland.

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Official URL: https://www.tu-braunschweig.de/stab2016

Abstract

Turbulent mixed convection in a differentially heated vertical channel is simulated by means of direct numerical simulation and large eddy simulation. With regard to the LES different subgrid-scale models are compared and their ability to predict the f low is analysed. The comparison is based on statistical moments as weil as two-point correlations that show the models' abilities to represent the sizes of flow structures. A newly proposed local formulation for the classical Smagorinsky SGS model has been identified as the best choice for mixed convection flows, although it can still be improved. The importance of the accuracy of SGS heat flux models is shown to be negligible when the momentum transport is not predicred properly.Their influence can even lead to deviations in both momentum and heat transport as shown with the classical dynamic Smagorinsky model in combination with different SGS heat flux models.

Item URL in elib:https://elib.dlr.de/110508/
Document Type:Conference or Workshop Item (Speech)
Title:Subgrid scale modelling of Relaminarization Effects in a differentially heated channel
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wetzel, TimTim.Wetzel (at) dlr.deUNSPECIFIED
Wagner, ClausClaus.Wagner (at) dlr.deUNSPECIFIED
Date:2016
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Turbulenz, DNS, LES, Kanalströmung, Wärmestransport
Event Title:20. DGLR-Fachsymposium der STAB
Event Location:Braunschweig, Deutschland
Event Type:national Conference
Event Dates:08.-09- Nov. 2016
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Fluid Systems
Deposited By: Bachmann, Barbara
Deposited On:12 Jan 2017 16:19
Last Modified:13 Jan 2017 14:50

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