### Project Title:

Turbomachinery Vibration - Analysis With a New Parallel Time Decomposition Scheme

Continuum Dynamic, Inc.
P.O. Box 3073
Princeton, NJ 08543-3073
93-101.01 9282 __ AMOUNT REQUESTED $ 69,169.37
Turbomachinery Vibration - Analysis With a New Parallel Time Decomposition Scheme

### Abstract:

Current time-marching methods for assessing periodic blade loads
consume inordinate computational time, greatly restricting analysis
and design based on such approaches. This study seeks to redress
this drawback by implementing a novel time-domain decomposition
algorithm on a parallel computer. This parallel scheme will achieve
orders of magnitude reduction in computation times while making
full use of existing sequential algorithms for simulating periodic
systems on parallel computers. Perfect load balance will be
accomplished and inter-processor communication minimized using the
proposed scheme. Though the parallel algorithm is applicable to any
time-periodic system this effort will focus upon the rotor-stator
interaction problem using an existing highly accurate aeroelastic
analysis. By basing the analysis on a validated fluid-structure
interaction code, another drawback of existing rotor-stator codes
namely the absence of a true aeroelastic capability will be
repaired. In Phase I, validation exercises will be conducted on a
parallel machine in order to assess the coding effort entailed in
adapting an existing serial code to parallel computation and CPU
gains over serial methods using the proposed technique. In Phase
II. the technique will be extended to full 3D viscous aeroelastic
turbomachinery rotor-stator computations on a parallel machine.
The principal benefit of this work to commercial licensers of this
technology would be an order of magnitude reduction in computation
time for periodic problems involving viscous compressible
turbomachinery flows through the use of a novel time-decomposition
algorithm implemented upon a parallel architecture. The reduced
analysis time should open new design capabilities previously
considered unrealistic because of prohibitive computation cost and
help alleviate the costs involved in experimental testing of
turbomachinery designs.
Fluid/Structure Interaction, Parallel Computing, Time Domain
Decomposition, Low Communication Overhead, Transonic Flow,
Turbomachinery, Aeroelasticity