Published 1986 | Version v1
Report Restricted

Parameterization of flows with helicity

Creators

  • 1. GKSS-Forschungszentrum Geesthacht G.m.b.H., Geesthacht-Tesperhude (Germany, F.R.). Inst. fuer Physik

Description

A parameterization of the turbulent fluxes in the Navier-Stokes equations will be suggested which includes not only diffusive properties of turbulence but also assumes orderly structures to be possible in turbulence. The orderly structure measured by the turbulent helicity is the 'Schraubensinn' of the turbulent eddies. It will be shown the terms of the new parameterization stabilize a model vortex. In the limit of vanishing eddy orientation (turbulent helicity approaches zero) the new parameterization reproduces the diffusion parameterization. (orig.)

Availability note (English)

MF available from INIS under the Report Number.

Abstract (German)

Es wird eine Parameterisierung der turbulenten Fluesse in den Navier-Stokes-Gleichungen vorgeschlagen, die nicht nur die diffusiven Eigenschaften der Turbulenz enthaelt, sondern auch Ordnungsstrukturen beruecksichtigt, die im turbulenten Stroemungsfeld vorhanden sein koennen. Die Ordnungsstruktur, die durch die turbulente Helizitaet gemessen wird, ist der Schraubensinn der turbulenten Wirbel. Es wird gezeigt, dass die Terme der neuen Parameterisierung einen Modellwirbel stabilisieren. Fuer den Grenzfall verschwindender Wirbelausrichtung (turbulente Helizitaet geht gegen null) geht die neue Parameterisierung in die Diffusionsparameterisierung ueber. (orig.)

Files

Restricted

The record is publicly accessible, but files are restricted to users with access.

Additional details

Additional titles

Original title (German)
Turbulenzparameterisierung in Stroemungen mit Helizitaet

Publishing Information

Imprint Pagination
131 p.
Report number
GKSS--86/E/36

INIS

Country of Publication
Germany
Country of Input or Organization
Germany
INIS RN
18019363
Subject category
S42: ENGINEERING;
Resource subtype / Literary indicator
Thesis
Descriptors DEI
BOUNDARY CONDITIONS; CORIOLIS FORCE; EARTH ATMOSPHERE; GREEN FUNCTION; HELICAL CONFIGURATION; HELICITY; ISOVECTORS; MULTI-PARAMETER ANALYSIS; NAVIER-STOKES EQUATIONS; ROTATION; SIMULATION; THREE-DIMENSIONAL CALCULATIONS; TURBULENCE; TURBULENT FLOW; VELOCITY; VORTICES
Descriptors DEC
CONFIGURATION; DIFFERENTIAL EQUATIONS; EQUATIONS; FLUID FLOW; FUNCTIONS; PARTIAL DIFFERENTIAL EQUATIONS; PARTICLE PROPERTIES; TENSORS; VECTORS