Large Eddy Simulations of Supersonic Jet Flows for Aeroacoustic Applications

Junqueira-Junior, Carlos; Yamouni, Sami; Azevedo, João Luiz F.; Wolf, William

doi:10.2514/6.2015-3306

Cited by 4 publications

(2 citation statements)

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“…Previous work have shown that the subgrid scale terms are too small when compared to the truncation error of the second order numerical scheme used in the current research. [30][31][32] Therefore, an implicit LES is performed in which all subgrid scales terms, [•] sgs , introduced in Eqs. ( 28) and ( 29) are neglected.…”

Section: Large Eddy Simulation Filteringmentioning

confidence: 99%

Dynamic Mode Decomposition of High Reynolds Number Supersonic Jet Flows

Yamouni,

Junqueira-Junior,

Azevedo

et al. 2023

Preprint

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Current design constraints have encouraged the studies of aeroacoustic fields around compressible jet flows. The present work addresses the numerical study of unsteady turbulent jet flows as a preparation for future aeroacoustic analyses of main engine rocket plumes. An in-house large eddy simulation tool is used in order to reproduce high fidelity results of compressible jet flows. The large eddy simulation formulation is written using a second order numerical scheme for a finite difference spatial discretization. Numerical simulations of perfectly expanded jets are performed and the results are compared to the literature. Dynamic mode decompositions (DMD) of the jet flow, using large size three-dimensional snapshots, are performed. Three variables are analyzed, namely, the velocity magnitude, the vorticity magnitude and the divergence of velocity. In particular, two frequencies are identified and they are linked to flow structures observed in experiments performed by other authors in the literature. The spatial shapes of the corresponding dynamic modes are also discussed.

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Section: Large Eddy Simulation Filteringmentioning

confidence: 99%

Dynamic Mode Decomposition of High Reynolds Number Supersonic Jet Flows

Yamouni,

Junqueira-Junior,

Azevedo

et al. 2023

Preprint

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“…Numerical results of such configuration using the same code are presented in the work described in Ref. [2,44]. In the present article each simulation performs 1000 iterations or 24 hours of computation.…”

Section: Viiie Computational Performancementioning

confidence: 99%

Computational Performance of a LES Solver for Supersonic Jet Flow Applications

Junqueira-Junior

Azevedo

Yamouni

et al. 2017

23rd AIAA Computational Fluid Dynamics Conference

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An in-house large eddy simulation tool is developed in order to reproduce high fidelity results of compressible jet flows. The large eddy simulation formulation is written using the finite difference approach, with an explicit time integration and using a second order spatial discretization. The energy equation is carefully discretized in order to model the energy equation of the filtered Navier-Stokes formulation. Such numerical studies are very expensive and demand high performance computing. Message passage interface protocols are implemented into the code in order to perform parallel computations. The present work addresses the computational performance of the solver running on up to 400 processors in parallel. Different mesh configurations, whose size varies from approximately 5.9 million points to approximately 1.0 billion points, are evaluate in the current paper. Speedup and efficiency curves are evaluated in order to assess the strong scalability of the solver.

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