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

The development and validation of the unsteady, three-dimensional, multiblock, parallel turbomachinery how solver TFLO is presented, The unsteady Reynolds-averaged Navier-Stokes equations are solved using a cell-centered discretization on arbitrary multiblock meshes. The solution procedure is based on efficient explicit Runge-Kutta methods with several convergence acceleration techniques such as multigrid, implicit residual smoothing, and local time stepping. The solver is parallelized using domain decomposition, a single program multiple data strategy, and the message passing interface standard, Details of the communication scheme and load balancing algorithms are discussed. A general and efficient procedure for parallel interblade row interfacing is developed. The dual-time stepping technique is used to advance unsteady computations in time, The focus is on improving the parallel efficiency and scalability of the flow solver, as well as on its initial validation 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 results from other computational fluid dynamics codes used in aircraft engine industry.