A more efficient application of lattice-Boltzmann method for Stokes flow
Abstract
The clustering of red blood cells (RBC) had been studied using direct numerical simulation based on the classical lattice-Boltzmann (LB) computational approach. However, these simulations are not efficient because of exceedingly small time steps in the integration process. Considering that the blood flow in microcirculation is a very low Reynolds number flow, one can take advantage of the zero Reynolds number approximation and apply the LB method in a much more efficient manner. In this presentation, an improved LB method is suggested to effectively simulate the Stokes flow for longer time scales. The accuracy and high efficiency is demonstrated by simulating the rotation of an elliptical cylinder in shear flow and the sedimentation of a circular cylinder in a vertical channel at zero Reynolds number. The results are in perfect agreement with theoretical analysis for Stokes flows. The improved method saves up to 98% of CPU time for these types of simulations.
- Publication:
-
APS Division of Fluid Dynamics Meeting Abstracts
- Pub Date:
- November 2004
- Bibcode:
- 2004APS..DFD.KJ008D