Broadband and transient aeroacoustic analysis of a CRM-based joined wing configuration at low speeds

Hanman, Paul; Yao, Yufeng; Bouferrouk, Abdessalem

Abstract

This study presents a computational investigation into the aeroacoustic performance of a Joined Wing (JW) configuration at low subsonic speeds. The modelled JW geometry, derived from NASA’s Common Research Model (CRM) configuration, consists of a front and a rear wing, linked by a vertical joint. The aim is to assess airframe noise generated, including that from the joint. The analysis addresses some aspects of the limited literature on the aeroacoustics of unconventional JW designs by focusing on high angles of attack (8-12°) and subsonic speed of Mach 0.3 conditions that simulate initial climb conditions, where flow separation is more pronounced and airframe noise can be annoying to those living near airports. The analysis starts from a steady Reynolds-Averaged Navier-Stokes (RANS) approach with the k-ω SST turbulence model to provide the baseline flow field for a broadband noise model; the latter giving an overview of noise distributions on the wings and the joint surfaces. This is followed by transient flow simulations using a hybrid unsteady RANS (URANS) and large-eddy simulation (LES) approach that enables the capture of time-dependent flow features and acoustic signatures via the Ffowcs-Williams and Hawkings (FWH) formulation. In all simulations, it is clear that the leading edges of the two wings are sources of significant noise. Acoustic calculations from multiple receivers also reveal that the joint is an important noise contributor, and in the vicinity of the joint the acoustic power level of receivers can reach up to 120 dB. An overall sound pressure level (OASPL) assessment is also performed, with the vertical fin producing the highest noise level at 79.5 dB.

• Presentation Conference Type: Conference Paper (unpublished)
• Conference Name: 59th 3AF International Conference AERO2025-47-HANMAN on Applied Aerodynamics
• Start Date: Mar 24, 2025
• End Date: Mar 26, 2025
• Acceptance Date: Mar 12, 2025
• Publication Date: Apr 2, 2025
• Deposit Date: Apr 2, 2025
• Publicly Available Date: Apr 3, 2025
• Peer Reviewed: Peer Reviewed
• Public URL: https://uwe-repository.worktribe.com/output/14257919