Abstract
In the preceding report, a method of calculating various boundary configulations using stream function and vorticity method (ψ-ω method) for the finite difference procedure was presented, and the calculated flow patterns showed fairly good agreement with experimental ones.In this report, two simplified methods of treating obstacles in rooms are introduced. One is diffusion coefficient method (DCM) and the other is source term method (STM). DCM is more useful than STM since DCM can treat conjugate heat transfer problems in the same manner. We treat only rectangular room configulations, but these methods may be applied easily to non-rectangular rooms as well as non-rectangular obstacles. The applied calculation scheme in this study is primitive pressure-velocity code (P-V method). We calculate three kinds of geometrical conditions. Type I: There is an isolated island in rectangular rooms. Type II: There is a fence attached to the floor in rectangular rooms. Type III: There is one outlet at each vertical wall. The calculation method is examined in detail and its results are compared with visualized flow patterns together with the results of ψ-ω method. Main outcomes of the current study are as follows. Calculated results are proved to be reasonable qualitatively, but a little discrepancy is seen in the values between ψ-ω method and P-V method. Only a more detailed experiment would be able to judge the results more strictly. In the calculation procedure, P-V method is simpler than the ψ-ω method, but the latter is more stable and converges faster than the former. The simpleness of P-V method will be underlined much more in the calculations of three dimensional problems.
