Abstract
Microorganisms play a vital role in many biological and medical phenomena. Transport phenomena in a suspension of microorganisms are extremely important, because they dominate the growth and distribution of cells. In terms of fluid mechanics, however, mathematical modeling of a suspension of swimming microorganisms is still under way. In this article, I explain recent developments in modeling a suspension of microorganisms. Macroscopic properties of a suspension are strongly affected by the mesoscale flow structures, and the mesoscale flow structures are affected by the interactions between microorganisms. Thus, a bottom-up strategy, i.e. from a cellular level to a continuum suspension level, represents the natural approach to the study of a suspension of swimming microorganisms.
