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A comparison of methods for introducing synthetic turbulence

Matha, Marcel and Morsbach, Christian and Bergmann, Michael (2018) A comparison of methods for introducing synthetic turbulence. In: ECCOMAS - - ECFD 2018 - 6th European Conference on Computational Mechanics (Solids, Structures and Coupled Problems) / 7th European Conference on Computational Fluid Dynamics. ECCOMAS ECCM ECFD, 11. - 15. Juni 2018, Glasgow.

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Official URL: http://www.eccm-ecfd2018.org/admin/files/filePaper/p1497.pdf

Abstract

Scale resolving simulations are indispensable to provide in-depth knowledge of turbulence in order to improve turbulence modelling approaches for turbomachinery design processes. However, the in flow conditions of spatially evolving turbulent flow simulations are of utmost significance for the accurate reproduction of physics especially for Large Eddy Simulations. The present paper compares two approaches to introduce synthetically generated velocity fluctuations for Large Eddy Simulations: an in flow boundary condition and a source term formulation. In case of the boundary condition the velocity fluctuations are added to the mean velocity components at the inlet panel of the computational domain. The source term formulation uses an additional volume term in the momentum equation to add the fluctuating velocity field at an arbitrary location. The functionality of these methods in combination with the synthetic generation of fluctuations is validated in the generic test case of spatially decaying homogeneous isotropic turbulence. Furthermore, the spatial variation and anisotropy of turbulent statistics in a turbulent boundary layer as well as the development length of the different combinations, needed to reach a fully developed flow, are analysed for a turbulent channel flow.

Item URL in elib:https://elib.dlr.de/126212/
Document Type:Conference or Workshop Item (Speech)
Title:A comparison of methods for introducing synthetic turbulence
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Matha, Marcelmarcel.matha (at) dlr.deUNSPECIFIED
Morsbach, ChristianChristian.Morsbach (at) dlr.dehttps://orcid.org/0000-0002-6254-6979
Bergmann, MichaelMichael.Bergmann (at) dlr.deUNSPECIFIED
Date:June 2018
Journal or Publication Title:ECCOMAS - - ECFD 2018 - 6th European Conference on Computational Mechanics (Solids, Structures and Coupled Problems) / 7th European Conference on Computational Fluid Dynamics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Accepted
Keywords:synthetic turbulence, source term, Large Eddy Simulation
Event Title:ECCOMAS ECCM ECFD
Event Location:Glasgow
Event Type:international Conference
Event Dates:11. - 15. Juni 2018
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation methods
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology
Institute of Propulsion Technology > Numerical Methodes
Deposited By: Matha, Marcel
Deposited On:28 Jan 2019 07:21
Last Modified:31 Jul 2019 20:24

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