Aerodynamics and Design for Ultra-Low Reynolds Number Flight

Chapter 2
Two-Dimensional Computational
Analysis Methods
2.1 Motivation for Two-Dimensional Analysis
In many aerospace applications two-dimensional analysis is considered to be of limited
value due to the existence of a large established knowledge-base and ever-increasing
computational abilities that allow three-dimensional analysis of complex configurations
and phenomena. These views may be justified when the end goal is the design of a
specific device for a particular application, or to expand the level of understanding
beyond the limits of two-dimensional study, but the present work encompasses
something entirely different. The existing knowledge-base at ultra-low Reynolds
numbers pertaining to applied aerodynamics, airfoils, and flight vehicle design is
minimal. The need for a broader understanding of these areas, combined with limited
time and resources, makes two-dimensional analysis a practical starting point. The
analyses are relatively fast, permitting a large and varied test matrix. This is essential
when the investigation is broadly exploratory both in geometry and flow properties.
Two-dimensional analysis can also provide a more informative picture of fundamental
behavior, free from three-dimensional effects such as cross-flow and induced drag which
can be difficult to discern and isolate in both computational and experimental results.
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