This HTML5 document contains 44 embedded RDF statements represented using HTML+Microdata notation.

The embedded RDF content will be recognized by any processor of HTML5 Microdata.

Namespace Prefixes

Prefix	IRI
dcterms	http://purl.org/dc/terms/
dbo	http://dbpedia.org/ontology/
n10	http://dbpedia.org/resource/File:
foaf	http://xmlns.com/foaf/0.1/
n12	https://global.dbpedia.org/id/
dbt	http://dbpedia.org/resource/Template:
rdfs	http://www.w3.org/2000/01/rdf-schema#
freebase	http://rdf.freebase.com/ns/
n6	http://commons.wikimedia.org/wiki/Special:FilePath/
rdf	http://www.w3.org/1999/02/22-rdf-syntax-ns#
owl	http://www.w3.org/2002/07/owl#
wikipedia-en	http://en.wikipedia.org/wiki/
dbp	http://dbpedia.org/property/
dbc	http://dbpedia.org/resource/Category:
prov	http://www.w3.org/ns/prov#
xsdh	http://www.w3.org/2001/XMLSchema#
wikidata	http://www.wikidata.org/entity/
dbr	http://dbpedia.org/resource/

Statements

Subject Item

dbr:Multiscale_turbulence

rdfs:label

Multiscale turbulence

rdfs:comment

Multiscale turbulence is a class of turbulent flows in which the chaotic motion of the fluid is forced at different length and/or time scales. This is usually achieved by immersing in a moving fluid a body with a multiscale, often fractal-like, arrangement of length scales. This arrangement of scales can be either passive or active Multiscale turbulence has also played an important role into probing the internal structure of turbulence. This sort of turbulence allowed researchers to unveil a novel dissipation law in which the parameter in

foaf:depiction

n6:Fractalgrids.svg

dcterms:subject

dbc:Fluid_dynamics dbc:Turbulence dbc:Chaos_theory

dbo:wikiPageID

45507060

dbo:wikiPageRevisionID

1122135295

dbo:wikiPageWikiLink

dbr:Andrey_Kolmogorov dbr:Fluid dbr:Frequency dbr:Eddy_(fluid_dynamics) dbr:Root_mean_square dbr:Automatic_control dbr:Lewis_Fry_Richardson n10:Fractalgrids.svg dbc:Fluid_dynamics dbr:Scientific_law dbr:Fractal dbr:Reynolds_number dbc:Turbulence dbr:Vortex_shedding dbr:Length_scale dbr:Energy_cascade dbr:Spoiler_(aeronautics) dbr:Turbulence dbr:Heat_transfer dbr:Freestream dbr:Acoustic_noise dbc:Chaos_theory dbr:Dissipation

owl:sameAs

n12:2AefB freebase:m.012zlk_b wikidata:Q22907106

dbp:wikiPageUsesTemplate

dbt:YouTube dbt:Reflist dbt:Orphan

dbo:thumbnail

n6:Fractalgrids.svg?width=300

dbp:id

FaWCLl_qVR4

dbp:title

See

dbo:abstract

Multiscale turbulence is a class of turbulent flows in which the chaotic motion of the fluid is forced at different length and/or time scales. This is usually achieved by immersing in a moving fluid a body with a multiscale, often fractal-like, arrangement of length scales. This arrangement of scales can be either passive or active As turbulent flows contain eddies with a wide range of scales, exciting the turbulence at particular scales (or range of scales) allows one to fine-tune the properties of that flow. Multiscale turbulent flows have been successfully applied in different fields., such as: * Reducing acoustic noise from wings by modifying the geometry of spoilers; * Enhancing heat transfer from impinging jets passing through grids; * Reducing the vortex shedding intensity of flows past normal plates without changing the shedding frequency; * Enhancing mixing by energy-efficient stirring; * Improving flow metering and flow conditioning in pipes; * Improving combustion. Multiscale turbulence has also played an important role into probing the internal structure of turbulence. This sort of turbulence allowed researchers to unveil a novel dissipation law in which the parameter in is not constant, as required by the Richardson-Kolmogorov energy cascade. This new law can be expressed as , with , where and are Reynolds numbers based, respectively, on initial/global conditions (such as free-stream velocity and the object's length scale) and local conditions (such as the rms velocity and integral length scale). This new dissipation law characterises non-equilibrium turbulence apparently universally in various flows (not just multiscale turbulence) and results from non-equilibrium unsteady energy cascade. This imbalance implies that new mean flow scalings exist for free shear turbulent flows, as already observed in axisymmetric wakes

prov:wasDerivedFrom

wikipedia-en:Multiscale_turbulence?oldid=1122135295&ns=0

dbo:wikiPageLength

9157

foaf:isPrimaryTopicOf

wikipedia-en:Multiscale_turbulence