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- W2066828364 abstract "ThevalidityofthelatticeBoltzmannmethodfordirectaeroacousticssimulationsdependsonitsabilitytocorrectly recovertheequationofstateofthegasanditsdynamicviscosity.ThispaperpresentsalatticeBoltzmannmethodwith tworelaxationtimestocarryoutthedirectaeroacousticssimulationsofatwo-dimensionalGaussiansoundpulseina uniform flowoverarangeofMachnumbers(M)varyingfrom0.01to0.9.Itisassumedthatthereisnoshockpresent intherangeofMachnumberstested.Asixth-order finite-differenceschemeisusedtoevaluatetheconvectivetermin the modeled Boltzmann equation, and a second-order Runge–Kutta scheme is used to forward march in time. Thus solved, the calculations show that the wave propagation speed (c) over the range 0:01 � M � 0:9, determined from the deduced equation of state and from the propagation of the pulse, are in good agreement with theoretical analysis and direct numerical simulation results obtained by solving the unsteady compressible Navier–Stokes equations using a low-dispersive and low-dissipative finite-difference scheme. The specific heat ratio (� ) for a diatomic gas is recovered correctly and so is the dependence of the internal energy on � . Thus, the proposed lattice Boltzmann method is valid for direct aeroacoustics simulations at very low to near transonic M." @default.
- W2066828364 created "2016-06-24" @default.
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- W2066828364 date "2006-12-01" @default.
- W2066828364 modified "2023-09-24" @default.
- W2066828364 title "Propagation Speed, Internal Energy, and Direct Aeroacoustics Simulation Using Lattice Boltzmann Method" @default.
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- W2066828364 doi "https://doi.org/10.2514/1.18933" @default.
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