A second golden age of aeroacoustics?

Lele, Sanjiva K.; Nichols, Joseph W.

doi:10.1098/rsta.2013.0321

Cited by 50 publications

(31 citation statements)

References 157 publications

(187 reference statements)

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“…There is discussion on how research in relation to Google and Facebook may offer assistance with the issue of dealing with the massive datasets from NDS. This is also discussed in the paper by Lele & Nichols [7]. Specific numerical challenges relating to turbomachinery-such as phase lagged boundary conditions-are discussed and potential algorithms to overcome them are given.…”

Section: Aeroenginesmentioning

confidence: 99%

“…Evidently, current predictions suggest 30 exaFLOPS should be possible in 2030. Like Gourdain et al and also Lele & Nichols [7], a future role for lattice Boltzmann methods is noted. A greater understanding of these methods' numerical traits might well be helpful.…”

Section: Airframesmentioning

confidence: 99%

“…The paper by Lele & Nichols [7]-a second golden age of aeroacoustics-has a wide-looking perspective that encompasses some practical engineering needs to deep issues associated with modelling and performing large-scale acoustic simulations. Computational algorithms for aeroacoustics are discussed.…”

Section: Aeroacousticsmentioning

confidence: 99%

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Aerodynamics, computers and the environment

Tucker

DeBonis

2014

Phil. Trans. R. Soc. A.

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Section: Aeroenginesmentioning

confidence: 99%

Section: Airframesmentioning

confidence: 99%

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Aerodynamics, computers and the environment

Tucker

DeBonis

2014

Phil. Trans. R. Soc. A.

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“…However, none of the current models are capable of explaining all the experimental observations (Viswanathan & Czech 2009) and significant efforts are currently devoted to improving the models (Suzuki 2010), laboratory experiments (Viswanathan & Czech 2009) and the computational simulations (e.g. Lele & Nichols 2014). All these studies are related to the entrainment of one fluid into another, however a volcanic eruption involves additional phenomena that need to be considered, especially in the near field or local region (i.e.…”

Section: Introductionmentioning

confidence: 99%

Seismic-acoustic energy partitioning during a paroxysmal eruptive phase of Tungurahua volcano, Ecuador

Palacios

Dı́ez

Kendall

et al. 2016

Geophysical Journal International

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S U M M A R YStudies of discrete volcanic explosions, that usually last less than 2 or 3 min, have suggested that the partitioning of seismic-acoustic energy is likely related to a range of physical mechanisms that depend on magma properties and other physical constraints such as the location of the fragmentation surface. In this paper, we explore the energy partition of a paroxysmal eruptive phase of Tungurahua volcano that lasted for over 4 hr, on 2006 July 14-15, using seismicacoustic information recorded by stations on its flanks (near field). We find evidence of a linear scaling between seismic and acoustic energies, with time-dependent intensities, during the sustained explosive phase of the eruption. Furthermore, we argue that this scaling can be explained by two different processes: (1) the fragmentation region ultimately acts as the common source of energy producing both direct seismic waves, that travel through the volcanic edifice, and direct acoustic waves coming from a disturbed atmosphere above the summit; (2) the coupling of acoustic waves with the ground to cause seismic waves. Both processes are concurrent, however we have found that the first one is dominant for seismic records below 4 Hz. Here we use the linear scaling of intensities to construct seismic and acoustic indices, which, we argue, could be used to track an ongoing eruption. Thus, especially in strong paroxysms that can produce pyroclastic flows, the index correlation and their levels can be used as quantitative monitoring parameters to assess the volcanic hazard in real time. Additionally, we suggest from the linear scaling that the source type for both cases, seismic and acoustic, is dipolar and dominant in the near field.

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“…This approach has achieved remarkable success in many applications. Refer to the review article [12] in this Theme Issue for details. The fidelity of the approach hinges upon the following questions:…”

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confidence: 99%

High-order computational fluid dynamics tools for aircraft design

Wang

2014

Phil. Trans. R. Soc. A.

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Most forecasts predict an annual airline traffic growth rate between 4.5 and 5% in the foreseeable future. To sustain that growth, the environmental impact of aircraft cannot be ignored. Future aircraft must have much better fuel economy, dramatically less greenhouse gas emissions and noise, in addition to better performance. Many technical breakthroughs must take place to achieve the aggressive environmental goals set up by governments in North America and Europe. One of these breakthroughs will be physics-based, highly accurate and efficient computational fluid dynamics and aeroacoustics tools capable of predicting complex flows over the entire flight envelope and through an aircraft engine, and computing aircraft noise. Some of these flows are dominated by unsteady vortices of disparate scales, often highly turbulent, and they call for higher-order methods. As these tools will be integral components of a multi-disciplinary optimization environment, they must be efficient to impact design. Ultimately, the accuracy, efficiency, robustness, scalability and geometric flexibility will determine which methods will be adopted in the design process. This article explores these aspects and identifies pacing items.

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A second golden age of aeroacoustics?

Cited by 50 publications

References 157 publications

Aerodynamics, computers and the environment

Aerodynamics, computers and the environment

Seismic-acoustic energy partitioning during a paroxysmal eruptive phase of Tungurahua volcano, Ecuador

High-order computational fluid dynamics tools for aircraft design

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