Large-Eddy Simulation of Subsonic Turbulent Jets and Their Radiated Sound

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Fältnamn	Indikatorer	Metadata
000		03334naa a2200289 4500
001		oai:research.chalmers.se:13e5c77a-8be6-4d84-877f-2698ae30d5d0
003		SwePub
008		171008s2005 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
024	7	a https://research.chalmers.se/publication/162582 URI
040		a (SwePub)cth
041		a engb eng
042		9 SwePub
072	7	a art2 swepub-publicationtype
072	7	a ref2 swepub-contenttype
100	1	a Andersson, Niklas,d 1976u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)nian
245	1 0	a Large-Eddy Simulation of Subsonic Turbulent Jets and Their Radiated Sound
264	1	c 2005
520		a Large-Eddy Simulations (LES) of a compressible nozzle/jet configuration have been carried out. Two jets were simulated, an isothermal jet and a jet with a higher temperature than the quiescent surrounding air. The Mach number was in both cases 0.75 and the jet Reynolds number was 50,000. Sound pressure levels in far-field observer locations were evaluated using Kirchhoff surface integration. The Favre filtered Navier-Stokes equations were solved using a finite volume method solver with a low-dissipation third-order upwind scheme for the convective fluxes, a second-order centered difference approach for the viscous fluxes and a three-stage second-order Runge-Kutta technique in time. The computational domain was discretized using a block structured boundary fitted mesh with approximately 3,000,000 cells. The calculations were performed on a parallel computer, using message-passing interface (MPI). A compressible form of Smagorinsky's subgrid scale model was used for computation of the subgrid scale stresses. Absorbing boundary conditions based on characteristic variables were adopted for all free boundaries. Velocity components specified at the entrainment boundaries were estimated from corresponding Reynolds Averaged Navier-Stokes (RANS) calculations, which enable the use of a rather narrow domain. This, furthermore, ensures that the correct amount of fluid is entrained into the domain. Two-point space-time correlations were obtained for locations in the shear layer center, from which length and time scales of turbulence structures were evaluated. Predicted near-field flow statistics and far-field sound pressure levels (SPL) are both in good agreement with experiments. Predicted (SPL) are for all observers locations, where evaluated, within a 3.0 [dB] deviation from measured levels and for most locations within a 1.0 [dB] deviation. Experimental data used for validation were provided by Laboratoire dEtude Aeròdynamiques, Poiters, France.
650	7	a TEKNIK OCH TEKNOLOGIERx Maskinteknikx Strömningsmekanik och akustik0 (SwePub)203062 hsv//swe
650	7	a ENGINEERING AND TECHNOLOGYx Mechanical Engineeringx Fluid Mechanics and Acoustics0 (SwePub)203062 hsv//eng
653		a Jet noise
653		a LES
700	1	a Eriksson, Lars-Erik,d 1950u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)lee
700	1	a Davidson, Lars,d 1957u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)lada
710	2	a Chalmers tekniska högskola4 org
773	0	t AIAA Journalg 43:9, s. 1899-1912q 43:9<1899-1912
856	4 8	u https://research.chalmers.se/publication/16258

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