Subgrid scale contribution to noise production in decaying isotropic turbulence
| Autor: | Christophe Bailly, Daniel Juvé, Pierre Sagaut, Christelle Seror |
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| Přispěvatelé: | Institut Jean Le Rond d'Alembert (DALEMBERT), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Mecanique des Fluides et d'Acoustique (LMFA), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS) |
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| Zdroj: | Scopus-Elsevier 5th AIAA/CEAS Aeroacoustics Conference and Exhibit 5th AIAA/CEAS Aeroacoustics Conference and Exhibit, 1999, Bellevue, France. ⟨10.2514/6.1999-1979⟩ |
| DOI: | 10.2514/6.1999-1979⟩ |
| Popis: | An estimation of the noise generated by subgrid scales provided by a large-eddy simulation (LES) calculation is performed based on a priori tests. The derivation of Navier-Stokes equation to obtain Lighthill's equation (Lighthill, M.J.) is presented for both the direct numerical simulation (DNS) and the LES Navier-Stokes equations. The Lighthill tensor is split into several parts: a high-frequency part that is not resolved by LES calculation, the filtered Lighthill tensor computed from basic filtered variables, and a subgrid-scale tensor. A DNS of decaying isotropic turbulence is carried out to evaluate the contribution of each term to the noise production. It is confirmed that the high-frequency part of Lighthill's tensor does not contribute significantly to noise production for the usual cutoff wave number value of LES. The subgrid-scale contribution cannot be neglected and requires the use of a subgrid-scale model to recover reliable results dealing with the acoustic field. The acoustic contribution computed using a subgrid-scale model of scale similarity type is compared to the acoustic contribution of the exact subgrid-scale tensor |
| Databáze: | OpenAIRE |
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