Development and validation of a massively parallel flow solver for turbomachinery flows

The development and validation of the unsteady, three-dimensional, multiblo ck, parallel turbomachinery how solver TFLO is presented, The unsteady Reyn olds-averaged Navier-Stokes equations are solved using a cell-centered disc retization on arbitrary multiblock meshes. The solution procedure is based on efficient explicit Runge-Kutta methods with several convergence accelera tion techniques such as multigrid, implicit residual smoothing, and local t ime stepping. The solver is parallelized using domain decomposition, a sing le program multiple data strategy, and the message passing interface standa rd, Details of the communication scheme and load balancing algorithms are d iscussed. A general and efficient procedure for parallel interblade row int erfacing is developed. The dual-time stepping technique is used to advance unsteady computations in time, The focus is on improving the parallel effic iency and scalability of the flow solver, as well as on its initial validat ion of steady-state calculations in multiblade row environment. The result of this careful implementation is a solver with demonstrated scalability up to 1024 processors. For validation and verification purposes, results from TFLO are compared with both existing experimental data and computational r esults from other computational fluid dynamics codes used in aircraft engin e industry.