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Communication Dans Un Congrès Année : 2022

Energy transfer in turbulence using Lattice Boltzmann Method based on large-eddy simulation

Résumé

Turbulent flows are characterized by the emergence of simultaneous downscale and upscale energy transfer. The challenge is to control the velocity in two complex geometries. A spectral analysis and a fluctuation velocity were performed on the numerical data obtained from Lattice Boltzmann method (LBM) and large-eddy simulation (LES) of the turbulent flow. In this context, the background of LBM is presented and the construction of Navier-Stokes equations from Boltzmann equation is discussed. The LBM-LES model was developed for solving transition and implanted turbulence modeling. A Fourier transform was chosen to study signals from LBM-LES model and to provide a local analysis of transient turbulent events. The flow in a cavity, as well as the flow around a cylindrical obstacle, were studied with a focus on the evolution of these flows at a high Reynolds number. The simulation results show that the LBM-LES model can produce results in good agreement with other numerical methods and experimental data. It should be noted that this model is easy to apply to complex geometries. The investigated geometries are to be considered a first step that provides, validates, and reliable simulation of the specific properties of the turbulent regime. The behavior of streamlining plots with increasing Reynolds number is exhibited. In the present study, a new method is developed to measure the fluctuating velocity in the turbulent boundary layer. The analyses data were taken from a different position inside the flows, allowing investigation of the turbulent flow. The shear effect on Kolmogorov’s −3 power-law scaling of the energy spectrum is discussed
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Dates et versions

hal-04154038 , version 1 (06-07-2023)

Identifiants

Citer

Insaf Mehrez, Ramla Gheith, Fethi Aloui. Energy transfer in turbulence using Lattice Boltzmann Method based on large-eddy simulation. 9ᵀᴴ EUROPEAN CONFERENCE FOR AERONAUTICS AND SPACE SCIENCES (EUCASS), Jun 2022, Lille, France. ⟨10.13009/EUCASS2022-7285⟩. ⟨hal-04154038⟩
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