Numerical simulations of gas resonant oscillations in a closed tube using lattice Boltzmann method

Numerical studies are presented for gas resonant oscillations in a two-dimensional closed tube using the lattice Boltzmann method. A multi-distribution function model of thermal lattice Boltzmann method is adopted in this work. The oscillating flow of the gas is generated by a plane piston at one end, and reflected by the other closed end. Both isothermal and adiabatic walls of the closed tube are considered. Boundary treatments such as moving adiabatic boundary are given in detail. The time dependent velocity, density and temperature at various locations of the tube for various frequencies and wall boundary conditions are presented. Shock waves with resonant frequency or slightly off-resonant frequencies are numerically captured. From the simulation results, the gas flow and heat transfer characteristics obtained are consistent qualitatively with those from previous simulations using conventional numerical methods.