Assessment of WALE and Sigma(σ) Sub-Grid Scale Models for Jet Noise Prediction

Mahak, Mahak; Moratilla-Vega, Miguel; Page, Gary J.; Xia, Hao

doi:10.2514/6.2016-2987

Cited by 3 publications

(5 citation statements)

References 12 publications

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“…The calculation of the inviscid flux is based on a secondorder Roe type scheme, with the inclusion of a smoothing parameter ( ) that acts as a blending between the central and the upwind terms in a similar way as in [41], hence controlling the amount of numerical dissipation. The use of this technique, has been demonstrated to give satisfactory results in previous studies [13,15,16]. The spatial scheme is:…”

Section: Lesmentioning

confidence: 85%

“…The subscript n defines quantities in the outward normal direction to the surface and the subscript ret refers to quantities computed at 'retarded' times. The FWH code used in this work has been used in previous studies with encouraging results [13,16,19].…”

Section: Far-field Noise Calculation Detailsmentioning

confidence: 99%

“…Shur, Spalart and Strelets [12] utilise a fifth-order Roe scheme, blended with a fourth order central-scheme. Conversely, Mahak et al [13,14], Angelino et al [15][16][17], Xia et al [18,19] and Tyacke et al [20][21][22] employ a second-order upwind scheme with a second-order central scheme. Second-order schemes are more dissipative than fifth-order, but have lower cost and more robustness than their higher order counterparts, so its use for complex configurations is more desirable.…”

Section: Introductionmentioning

confidence: 99%

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Jet noise analysis using an efficient LES/high-Order acoustic coupling method

et al. 2020

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Section: Lesmentioning

confidence: 85%

Section: Far-field Noise Calculation Detailsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Jet noise analysis using an efficient LES/high-Order acoustic coupling method

et al. 2020

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“…with g 2 i j = g ik g k j and δ i j as the Kronecker symbol. The WALE model is preferred over the Smagorinsky model since the former reproduces a more appropriate limiting behaviour near wall boundaries ν t ∝ y 3 [30] and provides zero contribution in pure 2D shear flow [31] for a reasonable level of complexity (less than, for instance σ-model).…”

Section: A Sub-grid Scalesmentioning

confidence: 99%

Comparison of Finite-Volume and Spectral/hp Methods for Large-Eddy Simulation of Combustor Port Flow

2022

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High-order accurate methods provide significant accuracy/cost benefits for well-resolved and geometrically simple scale-resolving turbulent flow simulations. However, the benefit on under-resolved unstructured grids for complex industrial geometries is unclear. The purpose of this work is to contribute to understanding of the benefit of high-order schemes for Large- Eddy Simulations (LES) in practical applications. A crucial requirement is a high-order solver that supports hybrid unstructured grids. In this context, accuracy and cost of a highorder spectral/hp Nektar++ solver and a standard second-order finite-volume OpenFoam solver are systematically compared for performing LES (with sub-grid scale treatments) on two configurations. The first configuration is Taylor-Green vortex, which shows that the accuracy benefit of fifth-order LES depends upon the mesh type and the level of under-resolution. The second configuration is geometrically more complex and represents the dilution port flows of gas turbine combustors. Specifically, the flow consists of cross-flow radial jets impinging onto each other, providing a rich variety of features and thus, making the case challenging. It is found that for a given cost, fifth-order LES reproduces the unsteady flow features significantly better and offers moderate improvements in the mean quantities. Moreover, results from a finer 5× more costly OpenFoam simulation suggest that for a similar accuracy, fifth-order LES could be 3-8× cheaper.

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“…The code is capable of solving arbitrary mesh topologies which is beneficial for complex geometries. The sub-grid scale model is chosen as σ -model [16] with model constant C σ = 1.35 [17].…”

Section: Les Solvermentioning

confidence: 99%

High-Order Propagation of Jet Noise on a Tetrahedral Mesh Using Large Eddy Simulation Sources

Moratilla-Vega

Saini

Xia

et al. 2020

Lecture Notes in Computational Science and Engineering

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Due to the rapid expansion of the commercial aviation industry, authorities have been tightening the legislation for aircraft noise. For instance, the European Commission has set a 65% reduction goal of overall aircraft noise from the year 2000 to 2050 [1]. The noise generated by the jet exhaust is one of the main contributors to the overall aircraft noise, especially during takeoff [2]. Moreover, in new generation ultra-high bypass ratio turbofan engines the increased interaction between the engine jet and the high-lift devices can potentially affect the noise field [3]. Thus, our overall aim is to develop and investigate an accurate and efficient method for the prediction of far-field jet noise in installed jet configurations. Rapid growth in computing power during the last decades has enabled the use of scale resolving numerical simulations for jet noise research at a reduced cost than most experimental campaigns. Conventionally, 2nd-order numerical schemes combined with surface integral techniques, particularly the Ffowcs Williams-Hawkings (FW-H) method [4] have been widely adopted for predicting the far-field noise, due to its simplicity and low cost. However, defining the envelope surface used in the FW-H method is not always trivial in complex configurations [5], for example, installed jets on aircraft wings. Also, the results may be overly sensitive to the size, shape and location of these surfaces. Now, directly resolving the Navier-Stokes (NS) equations for sufficiently accurate far-field jet noise results is prohibitively expensive [6]. LES using finite volume 2nd-order accurate schemes has proven to be reliable and robust for solving jets' near field, but large numerical dispersion and dissipation error makes them less suitable for the propagation of the

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Assessment of WALE and Sigma(σ) Sub-Grid Scale Models for Jet Noise Prediction

Cited by 3 publications

References 12 publications

Jet noise analysis using an efficient LES/high-Order acoustic coupling method

Jet noise analysis using an efficient LES/high-Order acoustic coupling method

Comparison of Finite-Volume and Spectral/hp Methods for Large-Eddy Simulation of Combustor Port Flow

High-Order Propagation of Jet Noise on a Tetrahedral Mesh Using Large Eddy Simulation Sources

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