[On the Ad-Hoc control and its effect on the passive scalar transport]
The behaviour of a passive scalar, represented by the temperature, is studied through two types of active control, Ad-Hoc wall-normal v and transverse w velocity components in a turbulent wall-bounded flow. A link is established between the flux and shear reduction at the wall. The Ad-Hoc control through the opposite in phase transverse velocity component is elucidated. The differences between v and w control are discussed through this mechanism.
Un scalaire passif tel que la température est ici soumis à l'action de deux contrôles actifs, Ad-Hoc v et w dans un écoulement turbulent de proche paroi. L'analyse des résultats permet d'établir le lien entre les diminutions de transfert de chaleur et de contrainte en paroi. On propose alors un mécanisme de réduction de frottement et de flux pariétal pour le contrôle w. Ce dernier permet d'expliquer les différences constatées lors de l'application des deux types de contrôle.
Accepted:
Published online:
Keywords: Heat transfer, Ad-Hoc control, Active control, Feedback control, Passive scalar, Turbulence, Drag reduction, Heat transfer reduction, DNS, Wall-bounded flows
Olivier Doche 1; Sedat Tardu 1
@article{CRMECA_2008__336_3_289_0, author = {Olivier Doche and Sedat Tardu}, title = {Sur le contr\^ole {Ad-Hoc} et son effet sur le transport d'un scalaire passif}, journal = {Comptes Rendus. M\'ecanique}, pages = {289--296}, publisher = {Elsevier}, volume = {336}, number = {3}, year = {2008}, doi = {10.1016/j.crme.2007.12.002}, language = {fr}, }
Olivier Doche; Sedat Tardu. Sur le contrôle Ad-Hoc et son effet sur le transport d'un scalaire passif. Comptes Rendus. Mécanique, Volume 336 (2008) no. 3, pp. 289-296. doi : 10.1016/j.crme.2007.12.002. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2007.12.002/
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