ABSTRACT
CFD methodology and computers have improved dramatically since the late 1980s. As a result, the development of numerical tools and physical models has become popular not only in academic research but also in industry, as CFD tools are increasingly being employed in routine design practices. In addition, CFD technology has advanced to a state that fl ows with both complicated geometry and complex physics can be analyzed with reasonable accuracy. Th ere are numerous methodologies employed by CFD analysts. Among these, the two most widely used methods are the density-and pressure-based approaches, and each approach has its own strengths and weaknesses. Th e basic concepts and diff erences between these two methods will be described later.
