Vortex dynamics - Application to the environmental impact of immersed structures
Identifieur interne : 000547 ( Main/Exploration ); précédent : 000546; suivant : 000548Vortex dynamics - Application to the environmental impact of immersed structures
Auteurs : Adrien Poupardin [France]Source :
Descripteurs français
- mix :
English descriptors
- mix :
Abstract
The study was performed experimentally. The vortices are generated by interaction between a monochromatic wave and a horizontal thin plate used as vortex generator. Their characterisation has been done in two and three dimensions. The two-dimensional vortex dynamics is characterized using PIV measurements. We observed the formation of downstream and upstream vortex pairs which are mutually advected toward the flume bottom and the free surface respectively. These evolutions are characterised through mean vortex trajectories computed thanks to λ2 criteria. It shows the presence of two stagnation point at the flume bottom due to the vortex pair advection and to the presence of two adjacent recirculation cells under the plate. These points would be a location of scouring phenomenon in the case of a sea bed. The three-dimensional vortex destabilisation has been studied thanks to the stereo-videography. The vortex cores are visualised with hydrogen micro bubbles generated at the edges of the plate by electrolysis. The deformation modes study, using a Fourier and a wavelet analysis, revealed that the deformation modes vary over the wave period. Strong axial velocity had been visualised on the vortex cores from the beginning of their development. These velocities are characteristics of strong destabilisations and vortex bursting.
Url:
Affiliations:
Links toward previous steps (curation, corpus...)
- to stream Hal, to step Corpus: 000372
- to stream Hal, to step Curation: 000372
- to stream Hal, to step Checkpoint: 000274
- to stream Main, to step Merge: 000551
- to stream Main, to step Curation: 000547
Le document en format XML
<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Vortex dynamics - Application to the environmental impact of immersed structures</title><title xml:lang="fr">Dynamique tourbillonnaire - Application à l'impact environnemental de structures immergées</title><author><name sortKey="Poupardin, Adrien" sort="Poupardin, Adrien" uniqKey="Poupardin A" first="Adrien" last="Poupardin">Adrien Poupardin</name><affiliation wicri:level="1"><hal:affiliation type="laboratory" xml:id="struct-56485" status="VALID"><orgName>Laboratoire Ondes et Milieux Complexes</orgName><orgName type="acronym">LOMC</orgName><desc><address><country key="FR"></country></address><ref type="url">http://www.univ-lehavre.fr/recherche/lomc/</ref></desc><listRelation><relation active="#struct-300317" type="direct"></relation><relation name="FRE1302" active="#struct-441569" type="direct"></relation></listRelation><tutelles><tutelle active="#struct-300317" type="direct"><org type="institution" xml:id="struct-300317" status="VALID"><orgName>Université du Havre</orgName><desc><address><country key="FR"></country></address></desc></org></tutelle><tutelle name="FRE1302" active="#struct-441569" type="direct"><org type="institution" xml:id="struct-441569" status="VALID"><idno type="ISNI">0000000122597504</idno><idno type="IdRef">02636817X</idno><orgName>Centre National de la Recherche Scientifique</orgName><orgName type="acronym">CNRS</orgName><date type="start">1939-10-19</date><desc><address><country key="FR"></country></address><ref type="url">http://www.cnrs.fr/</ref></desc></org></tutelle></tutelles></hal:affiliation><country>France</country><placeName><settlement type="city">Le Havre</settlement><region type="region" nuts="2">Région Normandie</region><region type="old region" nuts="2">Haute-Normandie</region></placeName><orgName type="university">Université du Havre</orgName></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">HAL</idno><idno type="RBID">Hal:tel-00832174</idno><idno type="halId">tel-00832174</idno><idno type="halUri">https://tel.archives-ouvertes.fr/tel-00832174</idno><idno type="url">https://tel.archives-ouvertes.fr/tel-00832174</idno><date when="2012-12-12">2012-12-12</date><idno type="wicri:Area/Hal/Corpus">000372</idno><idno type="wicri:Area/Hal/Curation">000372</idno><idno type="wicri:Area/Hal/Checkpoint">000274</idno><idno type="wicri:Area/Main/Merge">000551</idno><idno type="wicri:Area/Main/Curation">000547</idno><idno type="wicri:Area/Main/Exploration">000547</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Vortex dynamics - Application to the environmental impact of immersed structures</title><title xml:lang="fr">Dynamique tourbillonnaire - Application à l'impact environnemental de structures immergées</title><author><name sortKey="Poupardin, Adrien" sort="Poupardin, Adrien" uniqKey="Poupardin A" first="Adrien" last="Poupardin">Adrien Poupardin</name><affiliation wicri:level="1"><hal:affiliation type="laboratory" xml:id="struct-56485" status="VALID"><orgName>Laboratoire Ondes et Milieux Complexes</orgName><orgName type="acronym">LOMC</orgName><desc><address><country key="FR"></country></address><ref type="url">http://www.univ-lehavre.fr/recherche/lomc/</ref></desc><listRelation><relation active="#struct-300317" type="direct"></relation><relation name="FRE1302" active="#struct-441569" type="direct"></relation></listRelation><tutelles><tutelle active="#struct-300317" type="direct"><org type="institution" xml:id="struct-300317" status="VALID"><orgName>Université du Havre</orgName><desc><address><country key="FR"></country></address></desc></org></tutelle><tutelle name="FRE1302" active="#struct-441569" type="direct"><org type="institution" xml:id="struct-441569" status="VALID"><idno type="ISNI">0000000122597504</idno><idno type="IdRef">02636817X</idno><orgName>Centre National de la Recherche Scientifique</orgName><orgName type="acronym">CNRS</orgName><date type="start">1939-10-19</date><desc><address><country key="FR"></country></address><ref type="url">http://www.cnrs.fr/</ref></desc></org></tutelle></tutelles></hal:affiliation><country>France</country><placeName><settlement type="city">Le Havre</settlement><region type="region" nuts="2">Région Normandie</region><region type="old region" nuts="2">Haute-Normandie</region></placeName><orgName type="university">Université du Havre</orgName></affiliation></author></analytic></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="mix" xml:lang="en"><term>Environment</term><term>Flow</term><term>Instabilities</term><term>Vortex</term><term>Wave</term></keywords><keywords scheme="mix" xml:lang="fr"><term>Environnement</term><term>Houle</term><term>Instabilités</term><term>Structure</term><term>Tourbillon</term><term>Écoulements</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The study was performed experimentally. The vortices are generated by interaction between a monochromatic wave and a horizontal thin plate used as vortex generator. Their characterisation has been done in two and three dimensions. The two-dimensional vortex dynamics is characterized using PIV measurements. We observed the formation of downstream and upstream vortex pairs which are mutually advected toward the flume bottom and the free surface respectively. These evolutions are characterised through mean vortex trajectories computed thanks to λ2 criteria. It shows the presence of two stagnation point at the flume bottom due to the vortex pair advection and to the presence of two adjacent recirculation cells under the plate. These points would be a location of scouring phenomenon in the case of a sea bed. The three-dimensional vortex destabilisation has been studied thanks to the stereo-videography. The vortex cores are visualised with hydrogen micro bubbles generated at the edges of the plate by electrolysis. The deformation modes study, using a Fourier and a wavelet analysis, revealed that the deformation modes vary over the wave period. Strong axial velocity had been visualised on the vortex cores from the beginning of their development. These velocities are characteristics of strong destabilisations and vortex bursting.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Haute-Normandie</li><li>Région Normandie</li></region><settlement><li>Le Havre</li></settlement><orgName><li>Université du Havre</li></orgName></list><tree><country name="France"><region name="Région Normandie"><name sortKey="Poupardin, Adrien" sort="Poupardin, Adrien" uniqKey="Poupardin A" first="Adrien" last="Poupardin">Adrien Poupardin</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
EXPLOR_STEP=$WICRI_ROOT/Wicri/France/explor/LeHavreV1/Data/Main/Exploration
HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 000547 | SxmlIndent | more
Ou
HfdSelect -h $EXPLOR_AREA/Data/Main/Exploration/biblio.hfd -nk 000547 | SxmlIndent | more
Pour mettre un lien sur cette page dans le réseau Wicri
{{Explor lien
|wiki= Wicri/France
|area= LeHavreV1
|flux= Main
|étape= Exploration
|type= RBID
|clé= Hal:tel-00832174
|texte= Vortex dynamics - Application to the environmental impact of immersed structures
}}
| This area was generated with Dilib version V0.6.25. |  |