Project Title:

Evaluation of Indicial-Function Approach Using an Euler Finite-Element CFD Code

McIntosh Structural Dynamics, Inc.
883 N. Shoreline Blvd., Suite B200
Mountain View, CA 94043

93-103.11   9277  __      AMOUNT REQUESTED $ 52,443.

Evaluation of Indicial-Function Approach Using an Euler Finite-Element CFD Code

Abstract:

New methods are proposed for achieving fast execution of
aeroservoelastic aerospace vehicle flight-characteristics
simulations. Specifically, the exploitation of approximate
solutions that appear in the indicial-function representation of
generalized aerodynamic forces is proposed. The essence of the
innovation is transformation of the convolution integrals into a
set of linear first-order differential equations that augment the
system state vector; these added states are to be solved
concurrently with the other system states that describe the rigid
and elastic motions of the vehicle. The principal Phase I
objectives are to demonstrate this indicial-function procedure with
a finite-element Euler code and to document the reduced overall
effort required for simulation studies in comparison with direct
coupling of the Euler code with the solution of the vehicle motion
equations.

Potential commercial applications include incorporating the new
approach into existing NASA software and porting the code to
parallel-processing environments

Indicial functions, aeroservoelasticity, simulation