Abstract
An enhancement to the STARS integrated analysis tool has been developed in order to improve the practicality of time-marched supersonic aeroelastic solutions in an operational environment. A significant time savings in time-marched flutter prediction has been realized through the combination of a simplified aerodynamic model and an Euler flow solver. The one-dimensional wave equation is applied as a perturbation to a steady Euler solution, such that nonlinearities such as shock interactions are captured in the mean flow, and unsteady effects are treated as local perturbations. Application to configurations of practical interest have demonstrated the suitability of the methodology.
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Abbreviations
- ao :
-
Local Speed of Sound
- a∞ :
-
Freestream Speed of Sound
- C:
-
Generalized Structural Damping Matrix
- fa(t):
-
Generalized Aerodynamic Force Vector
- K:
-
Generalized Stiffness Matrix
- M:
-
Generalized Mass Matrix
- Po :
-
Local Nodal Pressure of Mean Flow
- P∞ :
-
Freestream Pressure
- q:
-
Generalized Displacement Vector
- Δu*:
-
Normalized Nodal Velocity (Δu/V∞)
- V∞ :
-
Freestream Velocity Magnitude
- γ:
-
Specific Heats Ratio
- ρo :
-
Local Nodal Density of Mean Flow
- ρ∞ :
-
Freestream Density
References
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© 1997 Springer-Verlag
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Arena, A.S., Gupta, K.K. (1997). Expediting time-marching supersonic flutter prediction through a combination of CFD and aerodynamic modeling techniques. In: Kutler, P., Flores, J., Chattot, JJ. (eds) Fifteenth International Conference on Numerical Methods in Fluid Dynamics. Lecture Notes in Physics, vol 490. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0107113
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DOI: https://doi.org/10.1007/BFb0107113
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