A hybrid RANS model of wing-body junction flow

Abstract

The three-dimensional flow separation over the Rood wing-body junction is an exemplar application of separation affecting many important flows in turbomachinery and aerodynamics. Conventional Reynolds Averaged Navier Stokes (RANS) methods struggle to reproduce the complexity of this flow. In this paper, an unconventional use is made of a hybrid Reynolds Averaged Navier Stokes (RANS) model to tackle this challenge. The hybridization technique combines the Menter − − model with the one equation sub-grid-scale (SGS) model by Yoshizawa through a blending function, based on the wall-normal distance. The hybrid RANS turbulence closure captured most of the flow features reported in past experiments with reasonable accuracy. The model captured also the small secondary vortex at the corner ahead of the wing nose and at the trailing edge. This feature is scarcely documented in the literature. The study highlights the importance of the spatial resolution near the wing leading edge, where this localised secondary recirculation was observed by the hybrid RANS model. It also provides evidence on the applicability of the hybrid Menter and Yoshizawa turbulence closure to the wing-body junction flows in aircraft and turbomachines, where the flows are characterised by a substantially time-invariant three-dimensional separation.

A Review of the Flow-Induced Noise Study for Centrifugal Pumps

“…With the development of the computer performance, both the calculation accuracy and speed have improved significantly. Computational Fluid Dynamics (CFD) is currently the most efficient method for analyzing the flow and flow-induced noise [49][50][51][52]. It is worh noting that the empirical model and assumption are used in the simulation process, so the experimental validation is essential.…”

Junction flow inside and around three-row cylindrical group on rigid flat surface

“…The interaction of the separation flow and the downflow generates a system of horseshoe vortices that envelope the base of the obstacle. Horseshoe vortex structures are unstable, change their shape, number, circulation and location, interact with each other and the streamlined surface, pair and break under the action of Reynolds and viscous stresses ( Rona et al., 2020 ; Robison et al., 2021 ; Qi et al., 2022 ; Lin and Wu, 2022 ). On the lateral sides of the bluff body, separated shear layers are formed.…”

“…In recent years, many studies have been carried out on the research of vortex and jet flows between single and group structures of bluff bodies and junction flows, both by numerical and experimental methods. RANS, DNS, LES and DES methods with various turbulence models k-ε, k-ω, k-g, SSD and others were used for numerical simulations ( Duraisamy et al., 2019 ; Rona et al., 2020 ; Chang et al., 2020 ; Chen et al., 2020a , 2020b ; Monti et al., 2020 ; Robison et al., 2021 ; Koken and Constantinescu, 2021 ; Hassan and Jalal, 2021 ; Zhao et al., 2022 ). Experimental studies of the fields of velocity, pressure, temperature and other parameters were carried out using a wide variety of sensors, measuring systems and equipment for recording, processing and analyzing data ( Bateni et al., 2019 ; Gautam et al., 2019 ; Galan et al., 2019 ; Hamed et al., 2019 ; Priyanka et al., 2019 ; Guan et al., 2019 ; Karimaei and Zarrati, 2019 ; Zuccarello et al., 2020 ; Yang et al., 2020 , 2021 ).…”