Direct Simulations Of Fluid Dynamic Sounds By
The Finite Difference Lattice Boltzmann Method
Author(s)
M. Tsutahara, A. Tamura, S. Tajiri & W. Long
Abstract
In this paper we present some applications of the finite difference lattice
Boltzmann method (FDLBM) to direct simulations of fluid dynamic sound. The
Arbitrary Lagrangian Eulerian formulation is introduced to FDLBM and the
sounds emitted from moving bodies are successfully simulated. The two-particle
model is used to simulate two-phase flows, and introducing a fluid elasticity the
sound propagation inside the liquid is simulated. The sounds generated on the
interface between the liquid and gas are also successfully simulated.
Keywords: fluid dynamic sound, lattice Boltzmann method, Arbitrary
Lagrangian Eulerian formulation, two-phase flow, under water sound.
1 Introduction
The lattice Boltzmann method [1–6] is now a very powerful tool of
computational fluid dynamics (CFD). This method is different from ordinary
Navier-Stokes equations based CFD methods, and is based on the particle
motions. However, mostly successful model so far is for incompressible fluids,
but several models for thermal compressible models have been proposed
including our model [7–13]. On the other hand, this method has great advantage
to simulate multi-phase flows, because the interface is automatically determined
in this method without special treatment [14–17].
We use a compressible fluid model of LBM and perform direct simulations of
aerodynamic sound emitted from moving bodies using the arbitrary Lagrangian
Eulerian formulation, especially the sound sources are detected. We also propose
a new model for liquids considering the elasticity of liquid, and the sound speed
propagating inside the liquid is correctly realized. A simulation of a water drop
colliding the water surface and sound emission is performed.
Keywords
fluid dynamic sound, lattice Boltzmann method, Arbitrary
Lagrangian Eulerian formulation, two-phase flow, under water sound.
Related Book
Other papers in this volume
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