Abstract
An Adaptive Grid technique, which has been developed for the 2-D numerical simulation of laminar flow, is applied to the 3-D numerical simulation of turbulent flow around a building by means of the K-ε two equation model. This technique is based on the idea of multiple component grids. The only part of flowfield where large values of errors occur, is refined and resolved in this technique. Regions which need grid refinement are deter-mined by the distribution of solution error in the method used here. Boundary conditions for refined grids are interpolated from the results with the coarser grid. In this study, boundary conditions for refined grids and those at the solid wall are investigated and modified in order to estimate the errors of the predicted flowfield by the 3-D K-ε two equation model accurately. The result using this modified boundary conditions can reproduce the levels of turbulent energy k in the wake well, in comparison with the results without mesh refinements techniques.
