Abstract
A Lattice-Boltzmann Method (LBM) based Very Large-eddy Simulation (VLES) approach was used to study the near-field noise generation around a complex nose landing gear configuration. LBM describes a fluid flow in terms of discrete kinetic equation based on the particle density distribution function (the Lattice Boltzmann equation). The macroscopic flow properties are results of the moments of these particle density distribution functions. The e ects of turbulence are modeled using two transport equations based on a revised renormalization-group (RNG) theory, and realized through an e ective particle-relaxation-time scale in the extended kinetic equations. The flow solution is obtained on a Cartesian grid system that resolves the boundary geometry exactly. A three dimensional, unsteady, compressible flow simulation is conducted to capture the instantaneous flow-field that is responsible for the near-field noise generation around the gear assembly. It is found that the interaction between small details of the gear components and local flow tends to produce high level fluctuations in both the low and high frequency ranges, which, contribute significantly to the overall noise generation.
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