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Prevention of Reynolds-Averaging with Regard to Turbulent Force Densities

Frahnert, Holger (2005) Prevention of Reynolds-Averaging with Regard to Turbulent Force Densities. Joint EWA and PivNet2 Workshop on CFD, PIV and Experiments in Aerodynamics, 2005-05-10 - 2005-05-11, Göttingen.

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Reynolds-averaging of the Navier-Stokes equations is an approach to derive equations of motion for averaged quantities of the flow field. The treatment of averaged quantities in fluid dynamics is justified with the ratio of masses and eigentimes being generally large between a body subject to flow forces and the particles of the fluid itself. A given state of the flow-field exhibits an averaged effect on its surrounding. Contrary, the development of a turbulent flow-field itself is determined by the interaction of fluid elements of comparable masses and eigentimes. Therewith, the averaging of the equations of motion describing the evolution of the flow-field is not immediately reasoned for. While for linear processes the averaging of physical quantities does directly carry through to the averaging of the underlying equations of motion it is a topic of concern for non-linear processes. In view of that it appears meaningful to distinguish between the averaging of a state of quantities and the averaging of evolutionary equations.

Item URL in elib:https://elib.dlr.de/22292/
Document Type:Conference or Workshop Item (Speech)
Title:Prevention of Reynolds-Averaging with Regard to Turbulent Force Densities
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:23Folien
Series Name:CD-ROM Proceedings
Keywords:Navier-Stokes, Reynolds-Averaging, Turbulent Force Densities
Event Title:Joint EWA and PivNet2 Workshop on CFD, PIV and Experiments in Aerodynamics
Event Location:Göttingen
Event Type:international Conference
Event Start Date:10 May 2005
Event End Date:11 May 2005
Organizer:DLR, AS-EV
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Micknaus, Ilka
Deposited On:08 Feb 2006
Last Modified:24 Apr 2024 19:03

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