Abstract
Abstract
Highlights
Turbulent boundary layers undergoing pressure gradients and separation have been the subject of a large number of studies due to their ubiquity in science and engineering
The solution from the preliminary 2-D Reynolds averaged Navier–Stokes (RANS) simulation with the SARC–low-Re closure used to obtain the inflow profiles is shown for comparison
The boundary layer over the Gaussian bump is deeply different; it experiences an adverse pressure gradient (APG) upstream of the acceleration which, while being mild, affects the velocity and stress profiles in a significant manner, there is a high degree of non-equilibrium in the sense of non-constant Clauser pressure gradient parameter, streamline curvature effects are present throughout the entire flow, and the Reynolds number is lower than what most experimental studies were able to achieve
Summary
Turbulent boundary layers undergoing pressure gradients and separation have been the subject of a large number of studies due to their ubiquity in science and engineering. The work presented in this paper addresses this need by offering a novel case of a boundary layer undergoing strong pressure gradients and streamline curvature effects of alternating sign with the purpose of increasing the understanding of these types of flows and provide detailed data for the improvement of lower fidelity turbulence models. The present DNS is part of a larger joint study with other research groups and two recent conference publications on DNS of this flow already exist (Balin et al 2020; Uzun & Malik 2020) The former presented preliminary results from this work to evaluate wall-modelled LES in the FPG and retransition regions, while the latter takes a more holistic approach with a greater emphasis on the incipient separation and subsequent recovery, making all three papers highly complementary.
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