Validation of approaches to solving the Reynolds-averaged Navier-Stokes equations and eddy-resolving methods in the study of anomalous intensification of turbulent separated flow in a stabilized hydrodynamic section of a structured channel with two-row inclined grooves
Isaev S. A.1,2, Chulyunin A. Yu.3, Gritckevich M. S.1, Nikushchenko E. A.1, Mikheev N. I.4, Dushin N. S.4
1State Marine Technical University, St. Petersburg, Russia
2Novikov St. Petersburg State University of Civil Aviation, St. Petersburg, Russia
3Institute of Mechanics, Lomonosov Moscow State University, Moscow, Russia
4Kazan Research Center RAS, Kazan, Russia
Email: isaev3612@yandex.ru
Numerical predictions of turbulent separated flow characteristics in inclined grooves in two-row dense packets in a structured channel in a stabilized section, obtained by solving the averaged Navier-Stokes equations and using a variant of the detached vortex method, are compared with each other and with the results of numerical and physical modeling in a long channel with 26 grooves in each row. Their acceptable agreement confirms the phenomenon of anomalous intensification of separated flow and flow acceleration in the core of the structured channel, with a 1.3-fold increase in maximum velocity compared to a plane-parallel channel. Keywords: velocity fields, structured channel, inclined grooves, core flow acceleration, RANS, IDDES.
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