Abstract
We have been applying the fluid analysis to predict an indoor thermal environment and an outdoor air flow. It is important that the technique to define building materials rapidly and exactly, to modify boundary conditions are developed. In this report, we introduce a real time analysis system which was realized by visualizing the results of fluid analysis as soon as calculated. Then, we describe examples of applying this system to the process of planning some buildings. Finally, we discuss a future technique for fluid analysis by using a rapid prototype method.