PREDICTION OF DUCT FLOWS WITH A PRESSURE-BASED PROCEDURE

First, a pressure-based procedure is developed for the prediction of t hree-dimensional steady incompressible flows using the general curvili near coordinate system. bt this procedure, a nonstaggered grid is adop ted, and the covariant velocity components are used as the main variab les when solving the momentum equations. To validate the present algor ithm, it is applied to predict the three-dimensional laminar flow irt a 90 degrees bend with square cross section. The computed velocity dis tributions are compared with the measurements and computations of othe rs. Second, with the aid of the k-epsilon turbulence model, the proced ure is applied to predict various duct flows. Time performances of var ious wall functions are compared numerically.