Influence of turbulence inflow conditions on aeroacoustics of wall-bounded flows
Bagheri E, Stanly R, Mukha T, Schlatter P (2026)
Publication Type: Journal article
Publication year: 2026
Journal
Book Volume: 118
Article Number: 110216
DOI: 10.1016/j.ijheatfluidflow.2025.110216
Abstract
A scale-resolving simulation of a turbulent boundary layer (TBL) requires an inflow condition that introduces turbulence into the domain. The boundary values must accurately approximate real turbulent structures in order to minimize the inflow adaption and to allow for sustained growth of the TBL. In practice, all inflow conditions incur an error on the flow field directly downstream. This error is typically quantified as the distance from the inlet at which the velocity statistics recover correct values. However, this measure is insufficient for simulations where evaluating acoustic pressure is an important outcome, necessitating a quantification of the error in the pressure field. This aspect of inflow generation is currently not addressed in the literature and constitutes the main topic of this article. We show that violation of the continuity equation near the inflow region generates spurious pressure fluctuations over the entire domain, leading to poor sound prediction results in low Mach number regimes. In particular, we look at three known inflow generation methods (namely, precursor simulations, the synthetic eddy method, and recycling using an upstream open channel flow) and evaluate how silent they are. For evaluation, the sensitive case of a TBL developing over a flat plate is used as the test case. The recycling method satisfies the divergence-free condition and introduces the least amount of spurious numerical noise to the sound field while giving reasonably good agreement in terms of the overall development of the TBL.
Authors with CRIS profile
Involved external institutions
Royal Institute of Technology / Kungliga Tekniska Högskolan (KTH)
Sweden (SE)
King Abdullah University of Science and Technology (KAUST) / جامعة الملك عبد الله للعلوم و التقنية
Saudi Arabia (SA)
Sweden (SE)
King Abdullah University of Science and Technology (KAUST) / جامعة الملك عبد الله للعلوم و التقنية
Saudi Arabia (SA)
How to cite
APA:
Bagheri, E., Stanly, R., Mukha, T., & Schlatter, P. (2026). Influence of turbulence inflow conditions on aeroacoustics of wall-bounded flows. International Journal of Heat and Fluid Flow, 118. https://doi.org/10.1016/j.ijheatfluidflow.2025.110216
MLA:
Bagheri, Eman, et al. "Influence of turbulence inflow conditions on aeroacoustics of wall-bounded flows." International Journal of Heat and Fluid Flow 118 (2026).
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