A MULTIGRID ALGORITHM FOR A MULTIBLOCK PRESSURE-BASED FLOW AND HEAT-TRANSFER SOLVER

A multigrid algorithm is developed along with an implicit multiblock p ressure-based solver for calculating flow and heat transfer problems o n nonorthogonal grids. The implicit treatment of the block interface h as proven to be important for the efficiency of a multiblock method In this study, the implicitness is adopted for all grid levels during a multigrid solution process. As a result, the block interface becomes i nvisible in the final solutions and the convergence is not adversely a ffected. The proposed multiblock multigrid algorithm is demonstrated o n several representative two-dimensional flow and heat transfer proble ms. The results show that order-of-magnitude saving in computational t ime can be achieved with the multigrid algorithm.