Multiblock interface treatments in a pressure-based flow solver

We report on measures to improve the robustness and performance of a three-dimensional pressure-based multiblock algorithm. In particular, we demonstrate the implementation of the treatment at block interfaces for arbitrary orientations of the blocks and investigate the effects of applying different boundary conditions on the pressure-correction equation at block boundaries. It is shown that the pressure corrections in different blocks need to be strongly coupled in order to achieve better convergence. The performance of the algorithm is also shown to be significantly affected by the way in which the multiblock solution scheme is organized for the individual equations, which are solved sequentially. The method developed is then applied to two practical flow problems involving turbulent and rotational effects in complex geometries.