Implementation of a rotary-wing Navier-Stokes solver on a massively parallel computer

An unsteady, compressible, three-dimensional, implicit Navier-Stokes solver (NSR3D) for helicopter and propeller applications has been implemented using FORTRAN with 8X array extensions on the massively parallel connectin machine (CM-2). The modifications to the original algorithms necessary to overcome communication bottlenecks and achieve reasonable computational efficiency on the CM-2 are described. The modified implicit solver achieves better than twice the speed of a CRAY-2 processor on a 16384 processor CM-2. Some programming issues for difficult problems such as solving the linear systems, the boundary conditions, and the dissipation switching are discussed.