Data assimilation of flow-acoustic resonance
WebJul 24, 2024 · A novel theoretical model of the internal flow field in multistage axial compressors based on an eigenvalue approach is developed, in order to predict the onset of acoustic resonance in aircraft engines. Using an example high-speed four-stage compressor, it is shown that one of the resultant frequencies is in excellent agreement … WebJun 1, 2024 · This website requires cookies, and the limited processing of your personal data in order to function. By using the site you are agreeing to this as outlined in our …
Data assimilation of flow-acoustic resonance
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WebOct 18, 2016 · The acoustic data assimilation (ADA), which melds instant observed data of different natures and various physical models, has recently been developed as a new … WebJan 1, 2009 · Flow-excited acoustic resonance of closed side-branches is caused by a feedback mechanism between the instability of the free shear layer at the mouth of the …
WebAug 31, 2024 · A nonlinear ensemble-variational data assimilation is performed in order to estimate the unknown flow field over a slender cone at Mach 6, from isolated wall-pressure measurements. ... who used a simple random-noise inflow forcing to model the receptivity processes from acoustic waves in a Mach-6 flow. However, significant overpredictions ... WebMar 30, 2024 · Abstract. Acoustic resonances in internal flows can cause noise, vibration, and even equipment damage. One geometry prone to acoustic resonance is a deadleg at the point where the main flow turns into a side branch. Here, we report experimental and computational fluid dynamics (CFD) studies of flow-generated pulsation in such a …
WebDec 15, 2024 · 1. Introduction. Flow-induced acoustic resonances in closed side branches are excited by an unstable separated shear flow, in which vortex-like structures form at the upstream edge of the branch and impinge at the downstream edge (Uchiyama and Morita, 2024).When the interaction and mutual enhancement between the unstable … WebApr 30, 2024 · The reconstruction performances of the proposed Navier–Stokes-based data-assimilation approach for single-instant velocity measurements (NS-DA-SIM) are assessed using a numerical dataset for the 3D flow past a cylinder. Comparisons with existing data assimilation methodologies allow to further illustrate the merits of the …
WebA data assimilation (DA) strategy was developed for accurate prediction of the flow-acoustic resonant fields within a channel-branch system. The challenges of numerical …
WebA data assimilation (DA) strategy was developed for accurate prediction of the flow-acoustic resonant fields within a channel-branch system. The challenges of numerical … fluttering butterfly sleeves worthWebOct 13, 2024 · We model the resonance mechanism underpinning generation of A1 and A2 screech tones in an under-expanded supersonic jet. Starting from the resonance model recently proposed by Mancinelli et al. (Exp. Fluids, vol. 60, 2024, p. 22), where the upstream-travelling wave is a neutrally stable guided-jet mode, we here present a more … greenhandle products private limitedWebJun 14, 2024 · The data-assimilated flow-acoustic resonant fields were then comprehensively validated in terms of their acoustic fields, time-averaged flow fields, and phase-dependent flow fields. The time-averaged flow fields were obtained from planar … A data assimilation (DA) strategy was developed for accurate prediction of the … A data assimilation (DA) strategy was developed for accurate prediction of the … green handle flatwarefluttering chestWebThis paper focuses on flow-excited acoustic resonance of closed side-branches. First, a design guide that can be used to predict the onset and the intensity of resonance is … green handheld machine to blow into for copdWebMay 3, 2024 · This work presents an anisotropic formulation for data assimilation (DA) of turbulent flows using the continuous adjoint system. This DA scheme serves as a tool to … green handled pregnancy testsWebAcoustic resonance is a phenomenon in which an acoustic system amplifies sound waves whose frequency matches one of its own natural frequencies of vibration (its resonance frequencies).. The term "acoustic resonance" is sometimes used to narrow mechanical resonance to the frequency range of human hearing, but since acoustics is defined in … greenhand organics