Counterrotating prop-fan simulations which feature a relative-motion multiblock grid decomposition enabling arbitrary time-stepsImprovements are presented of a computer algorithm developed for the time-accurate flow analysis of rotating machines. The flow model is a finite volume method utilizing a high-resolution approximate Riemann solver for interface flux definitions. The numerical scheme is a block LU implicit iterative-refinement method which possesses apparent unconditional stability. Multiblock composite gridding is used to orderly partition the field into a specified arrangement of blocks exhibiting varying degrees of similarity. Block-block relative motion is achieved using local grid distortion to reduce grid skewness and accommodate arbitrary time step selection. A general high-order numerical scheme is applied to satisfy the geometric conservation law. An even-blade-count counterrotating unducted fan configuration is chosen for a computational study comparing solutions resulting from altering parameters such as time step size and iteration count. The solutions are compared with measured data.
Document ID
19900032923
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Janus, J. Mark (Mississippi State Univ. Mississippi State, MS, United States)
Whitfield, David L. (Mississippi State University Mississippi State, United States)