Computational AeroAcoustics of Realistic Co-Axial Engines

Redonnet, Stephane; Mincu, Ciprian; Manoha, Eric

doi:10.2514/6.2008-2826

Cited by 24 publications

(27 citation statements)

References 5 publications

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“…Special attention was paid on the correct simulation of the boundary layers. 33 As can be seen in Fig. 10a where the instantaneous perturbed field is plotted, the calculation captured all the mechanisms characterizing such a cylinder/flow interaction problem, with -among other things -a strong dipolar acoustic emission (oriented orthogonally to the flow direction, and of a frequency corresponding to a Strouhal number of St = 0.1666).…”

Section: Acoustic Emission By a 2d Cylinder In A Low Reynolds/mach Numentioning

confidence: 99%

“…As for the continuous one introduced in Section 3, the discrete formulation described above was developed by the present first author through the years [17,18,22,24], and is the one that is now implemented in ONERA's time domain CAA solver sAbrinA 23 [17,18,32,33,40,41]. In particular, the latter solver integrates some of the innovative features presented here (NRI, IOFD), the other ones (SPC, IBP) having being implemented in a dedicated code, named cAmilA 24 [30].…”

Section: Some Remarksmentioning

confidence: 99%

“…As an illustration, regarding internal noise problems, such interface technique had been successfully applied to various cases (e.g. the aft fan noise emission by turbojet engines [32,33]), for which the acoustic signals to be CAA-forced had been derived via analytical means (based on the modal theory [4]). On another hand, regarding now external noise problems, the technique had been also applied with success to several airframe noise applications (e.g.…”

Section: Derivation Of An Innovative Weak Coupling Approachmentioning

confidence: 99%

“…Table 1 lists the set of weighting coefficients associated with such optimized 3-stage Runge-Kutta scheme. Please note that, regarding its use within a CAA context, this particular optimized scheme was validated on the basis of numerous test cases, before it was applied to various problems [20,32,33,40,41].…”

Section: Time Discretizationmentioning

confidence: 99%

“…All CAA computations were performed with the help of ONERA's sAbrinA solver [17,18,32,33,40,41], each being conducted over one core of a laptop (64 bits, Pentium 2.1 GHz, 4 Gb Ram) and requiring approximately 30 min of wall clock time. Next subsection summarizes these validation exercises (which detail can be found in [22][23][24][25][26][27][28][29][30]52]), so as to illustrate the main features composing the advanced CAA-based hybrid acoustic method described above.…”

Section: Tablementioning

confidence: 99%

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An advanced hybrid method for the acoustic prediction

Redonnet

Cunha

2015

Advances in Engineering Software

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Section: Acoustic Emission By a 2d Cylinder In A Low Reynolds/mach Numentioning

confidence: 99%

Section: Some Remarksmentioning

confidence: 99%

Section: Derivation Of An Innovative Weak Coupling Approachmentioning

confidence: 99%

Section: Time Discretizationmentioning

confidence: 99%

Section: Tablementioning

confidence: 99%

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An advanced hybrid method for the acoustic prediction

Redonnet

Cunha

2015

Advances in Engineering Software

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Development of optimized interpolation schemes with spurious modes minimization

Cunha

Redonnet

2015

Numerical Methods in Fluids

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SUMMARYThis work constitutes a fraction of a more extensive effort, which ultimate objective is the development of advanced aeroacoustics hybrid methods. Within this framework, we here focus on the interpolation step, on which generally rely all coupling processes that link altogether the various stages constituting any given hybrid method. In that regard, previous works by the present authors had revealed the intrinsic limitations and subsequent side effects (e.g., signal degradation) that weight on usual high-order interpolation schemes, whether the latter are of centered or noncentered nature, as well as optimized in an acoustic sense or not. Based on the outcomes of such study, here, a novel optimization technique for interpolation schemes is proposed. Such a technique, which is designed hereafter as the interpolation by parts (IBP), allows interpolating accurately a given signal, while minimizing its possible degradation. As a result, compared with its standard counterpart, any IBP -optimized interpolation scheme exhibits improved characteristics, such as a spurious modes generation that is greatly reduced (up to a 99% factor). Such improved characteristics are here validated on the basis of three test cases (of 1D, 2D and 3D nature), which illustrates the potentialities offered by the IBP optimization technique.

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The non‐reflective interface: an innovative forcing technique for computational acoustic hybrid methods

Redonnet

Lockard

Khorrami

et al. 2015

Numerical Methods in Fluids

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Summary The present article concerns a commonly used methodology for the numerical simulation of acoustic emission and propagation phenomena. We consider the so‐called multi‐stage hybrid acoustic approach, in which a given noise problem is simulated via a sequence of weakly coupled computations of noise generation and acoustic propagation stages, wherein the simulation of the propagation stage is based on advanced Computational AeroAcoustics (CAA) techniques. The paper introduces an original forcing technique, namely, the Non‐Reflective Interface (NRI), to enable the transfer of an acoustic signal from an a priori noise generation stage into a CAA‐based acoustic propagation phase. Unlike most existing forcing techniques, the NRI is non‐reflective (or anechoic) in nature and, therefore, can properly handle the backscattering effects arising during the noise propagation stage. This attribute makes the NRI‐based weak‐coupling procedure and the associated CAA‐based hybrid approach compatible with a larger variety of realistic noise problems (such as those involving installed configurations in wind tunnel experiments, for instance). The NRI technique is first validated via several test cases of increasing complexity and is then applied to two aerodynamic noise problems. Copyright © 2015 John Wiley & Sons, Ltd. Copyright © 2015 John Wiley & Sons, Ltd.

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Computational AeroAcoustics of Realistic Co-Axial Engines

Cited by 24 publications

References 5 publications

An advanced hybrid method for the acoustic prediction

An advanced hybrid method for the acoustic prediction

Development of optimized interpolation schemes with spurious modes minimization

The non‐reflective interface: an innovative forcing technique for computational acoustic hybrid methods

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