[Modélisation du détachement tourbillonnaire avec des oscillateurs de van der Pol interagissant par diffusion]
Nous analysons un modèle simple de la dynamique du sillage proche derrière une structure élancée. Le modèle est constitué par une distribution continue, le long de la structure, d'oscillateurs de van der Pol interagissant par diffusion. En écoulement cisaillé, la diffusion permet de décrire le détachement tourbillonnaire par cellules, dont la taille est ici calculée analytiquement en fonction des paramètres du modèle. Dans le cas d'une structure sinueuse en écoulement uniforme, le modèle reproduit qualitativement la suppression globale du détachement tourbillonnaire.
A simple model for the near wake dynamics of slender bluff bodies in cross-flow is analyzed. It is based on a continuous distribution of van der Pol oscillators arranged along the spanwise extent of the structure and interacting by diffusion. Diffusive interaction is shown to be able to model cellular vortex shedding in shear flow, the cell size being estimated analytically with respect to the model parameters. Moreover, diffusive interaction succeeds in describing qualitatively the global suppression of vortex shedding from a sinuous structure in uniform flow.
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Mot clés : mécanique des fluides, détachement tourbillonnaire, effets 3-D, systèmes dynamiques, oscillateur de van der Pol
Matteo Luca Facchinetti 1 ; Emmanuel de Langre 1 ; Francis Biolley 2
@article{CRMECA_2002__330_7_451_0, author = {Matteo Luca Facchinetti and Emmanuel de~Langre and Francis Biolley}, title = {Vortex shedding modeling using diffusive van der {Pol} oscillators}, journal = {Comptes Rendus. M\'ecanique}, pages = {451--456}, publisher = {Elsevier}, volume = {330}, number = {7}, year = {2002}, doi = {10.1016/S1631-0721(02)01492-4}, language = {en}, }
TY - JOUR AU - Matteo Luca Facchinetti AU - Emmanuel de Langre AU - Francis Biolley TI - Vortex shedding modeling using diffusive van der Pol oscillators JO - Comptes Rendus. Mécanique PY - 2002 SP - 451 EP - 456 VL - 330 IS - 7 PB - Elsevier DO - 10.1016/S1631-0721(02)01492-4 LA - en ID - CRMECA_2002__330_7_451_0 ER -
Matteo Luca Facchinetti; Emmanuel de Langre; Francis Biolley. Vortex shedding modeling using diffusive van der Pol oscillators. Comptes Rendus. Mécanique, Volume 330 (2002) no. 7, pp. 451-456. doi : 10.1016/S1631-0721(02)01492-4. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/S1631-0721(02)01492-4/
[1] Flow-Induced Vibrations, Van Nostrand–Reinhold, 1990
[2] Vortex shedding from bluff bodies in a shear flow: a review, J. Fluids Engrg., Volume 107 (1985), pp. 298-306
[3] Vortex shedding from slender cones at low Reynolds number, J. Fluid Mech., Volume 242 (1992), pp. 299-321
[4] An experimental study of vortex shedding behind linearly tapered cylinders at low Reynolds number, J. Fluid Mech., Volume 246 (1993), pp. 163-195
[5] Reduction of bluff-body drag and suppression of vortex shedding by the introduction of wavy separation lines, J. Fluids Structures, Volume 12 (1998), pp. 123-130
[6] A low-order model for vortex shedding patterns behind vibrating flexible cables, Phys. Fluids, Volume 10 (1998), pp. 1953-1961
[7] Phase dynamics of Karman vortices in cylinder wakes, Phys. Fluids, Volume 8 (1996), pp. 91-96
[8] Vortex shedding from slender cones at low Reynolds numbers, J. Fluid Mech., Volume 38 (1969) no. 3, pp. 565-576
[9] On cell formation in vortex streets, J. Fluid Mech., Volume 227 (1991), pp. 293-308
[10] A nonlinear oscillator model for vortex shedding from cylinders and cones in uniform and shear flows, J. Fluids Structures, Volume 10 (1996), pp. 197-214
[11] Dislocation motion in cellular structures, Phys. Rev. A, Volume 27 (1983), pp. 2710-2726
[12] Memory-induced frequency oscillations in closed convection boxes, Phys. Rev. Lett., Volume 75 (1995) no. 25, pp. 4618-4621
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