CADENCE: the development work included improvements of HO solver for rotor/stator configurations, inclusion of the FW-H acoustic propagation module in Fidelity software for time-domain and frequency-domain formulations and the introduction of acoustic liner capabilities in the CharLES solver, validated on an academic test case. The calculation work included NLH and CharLES high-fidelity WMLES aero-acoustic simulations on the ECL5 fan/ogv test case. The aerodynamic results were in good accordance with published data. NLH calculations were also performed with an acoustic liner. The project results demonstrate the feasibility of high-fidelity numerical methods to perform aero-acoustic analysis on a relevant industrial configuration, in hours. The experience gained with the high-fidelity setup will be re-used for other aero-acoustic configurations. The FW-H module will be accessible to all users, offering a key asset for performing aero-acoustic analysis in Fidelity GUI.
CERFACS: the work includes the implementation and validation of the MRF algorithm to extend the compressible LBM solver to rotating configurations, the enhancement of the solver isotropy property by developing new LBM scheme based on different equilibrium and lattice, the aerodynamic simulation of a NASA-STD turbofan engine scaled at 1:5 and the analysis of the best suited compressible porous numerical model, including theoretical analysis, implementation strategy and development of a test model. An aerodynamic validation of the LB compressible solver on the ECL5 test case was performed, including development of best practices and improvements to the wall treatment. The compressible porous numerical model was tested for a grazing impedance tube. The work was then centered around the extension of the domain to include the external area around the fan/OGV module for the purpose of evaluating acoustic propagation, and on further improvements to the LBM compressible solver. One of the major outcomes of this project is the enhancement of the ProLB (LBM) solver, enabling it to perform aeroacoustics simulations on rotating machinery. These advancements can be immediately utilized within SAE which used this solver, leading to more accurate and efficient simulations. Additionally, all the developed results have been shared with the broader LBM scientific and industrial community.
PSA3: for the determination and characterization of acoustic sources in the fan/OGV region, a new efficient and fast beamforming method was developed, based on the acoustic pressure, the flow speed vector and the temperature in a set of sensor points within the computation domain. The method was successfully applied to numerical results with Cadence NLH method and CERFACS LBM software on the ECL5 geometry and to LBM calculations by SAE on an installed UHBR configuration. The method was presented to the Aeroacoustics community at the CEAS/AIAA Aeroacoustics Conferences of 2023 and 2024. Further dissemination is foreseen at a DNW/Safran workshop. Safran expressed their interest for future numerical studies on UHBR geometries.
