A reduced order model of unsteady flows in turbomachinery

A novel technique for computing unsteady flows about turbomachinery cascades is presented. Starting with a frequency domain CFD description of unsteady aerodynamic flows, we form a large, sparse, generalized, non-Hermitian eigenvalue problem that describes the natural modes and frequencies of fluid motion about the cascade. We compute the dominant left and right eigenmodes and corresponding eigenfrequencies using a Lanczos algorithm. Then, using just a few of the resulting eigenmodes, we construct a reduced order model of the unsteady flow field. Moreover, the eigenmode information provides insights into the physics of unsteady flows. (from Authors)

Duke Authors

Cited Authors

  • Hall, KC; Florea, R; Lanzkron, PJ

Published Date

  • 1995

Published In

  • Transactions - ASME: Journal of Turbomachinery

Volume / Issue

  • 117 / 3

Start / End Page

  • 375 - 383