Validation of rans 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

S. A. Isaev^ab, A. Yu. Chulyunin^c, D. V. Nikushchenko^a, A. G. Sudakov<sup>b

a</sup> State Marine Technical University of St. Petersburg
^b Saint-Petersburg State University of Civil Aviation
^c Lomonosov Moscow State University, Institute of Mechanics

Abstract: Numerical predictions of turbulent separated flow characteristics in inclined grooves in two-row dense packets in a structured channel in a stabilized section, obtained using the RANS and IDDES approaches, 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 reasonable 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.

Received: 04.08.2025
Revised: 28.08.2025
Accepted: 29.08.2025

DOI: 10.61011/PJTF.2026.01.61915.20461

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