Analysis of the pressure fluctuations from an LBM simulation of turbulent channel flow
The results from a simulation of turbulent channel flow computed using the D3Q19 athermal lattice Boltzmann method (LBM) are compared to those calculated using Navier-Stokes-based solvers. It is found that, when the computational domain of the simulation is made large enough, the magnitude of the LBM's overprediction of the pressure fluctuations in the near-wall region is on the order of that expected from compressibility effects. However, the relationship between density, temperature, and pressure in the LBM is different from that found in a fully-compressible simulation. For this reason, it is recommended that the athermal LBM should not be used for simulations in which the density and temperature fluctuations may play an important role. (C) 2011 Elsevier Ltd. All rights reserved.
pressure fluctuations lbm turbulent channel flow dns