Journal ArticleDOI
Supersonic Flutter Analysis Based on a Local Piston Theory
TLDR
In this paper, a local-pistons theory was proposed for the prediction of inviscid unsteady pressure loads at supersonic and hypersonic speeds, and the results of two-and three-dimensional air loads and flutter predictions were compared with those obtained by the classical piston theory and an unstrainedy Euler method to assess the accuracy and validity.Abstract:
DOI: 10.2514/1.37750 A highly efficient local-piston theory is presented for the prediction of inviscid unsteady pressure loads at supersonic and hypersonic speeds. A steady mean flow solution is first obtained by an Euler method. The classical pistontheoryismodifiedtoapplylocallyateachpointontheairfoilsurfaceontopofthelocalmean flowtoobtainthe unsteadypressureperturbationscausedbythedeviationoftheairfoilsurfacefromitsmeanlocationwithouttheneed of performing unsteady Euler computations. Results of two- and three-dimensional unsteady air loads and flutter predictions are compared with those obtained by the classical piston theory and an unsteady Euler method to assess theaccuracyandvalidityrangeinairfoilthickness, flightMachnumber,andangleofattackandwiththepresenceof blunt leading edges. The local-piston theory is found to offer superior accuracy and much wider validity range compared with the classical piston theory, with the cost of only a fraction of the computational time needed by an unsteady Euler method.read more
Citations
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Journal ArticleDOI
Aeroelastic and Aerothermoelastic Analysis in Hypersonic Flow: Past, Present, and Future
TL;DR: In this article, it is shown that the body, surface panels, and aerodynamic control surfaces are flexible due to minimum-weight restrictions for hypersonic vehicle configurations, and that these flexible body designs will consist of long, slender lifting body designs.
Journal ArticleDOI
Approximate Modeling of Unsteady Aerodynamics for Hypersonic Aeroelasticity
TL;DR: In this paper, various approximations to unsteady aerodynamics are examined for the aero-elastic analysis of a thin double-wedge airfoil in hypersonic flow.
Journal ArticleDOI
Model Reduction of Computational Aerothermodynamics for Hypersonic Aerothermoelasticity
TL;DR: This study examines two model reduction strategies with the goal to enable the use of computational fluid dynamics within a long time-record, dynamic, aerothermoelastic analysis.
Journal ArticleDOI
Generalized Formulation and Review of Piston Theory for Airfoils
Marius-Corné Meijer,Laurent Dala +1 more
TL;DR: A brief review of some of the notable contributions to piston theory and its theoretical basis can be found in this paper, where a generalized formulation of the downwash equation is given, accounting for arbitrary motion in the plane of the airfoil.
References
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Journal ArticleDOI
Piston Theory-A New Aerodynamic Tool for the Aeroelastician
TL;DR: In this paper, a point-function relationship between the local pressure on the surface of a wing and the normal component of fluid velocity produced by the wing's motion is predicted, and the computation of generalized forces in aeroelastic equations, such as the flutter determinant, is then reduced to elementary integrations of assumed modes of motion.
Journal ArticleDOI
Review of Nonlinear Panel Flutter at Supersonic and Hypersonic Speeds
Journal ArticleDOI
Oscillating Airfoils at High Mach Number
TL;DR: In this article, a simple formula is given for the pressure distribution on an oscillating airfoil in two-dimensional flow at high Mach Number, which is expected to be reasonably accurate if the pressure on the surface remains within the range 0.2 to 3.5 times the mainstream pressure.
Proceedings ArticleDOI
Fully-implicit time-marching aeroelastic solutions
Juan J. Alonso,Antony Jameson +1 more
Journal ArticleDOI
Calculation of Wing Flutter by a Coupled Fluid-Structure Method
TL;DR: In this article, an integrated computational fluid dynamics (CFD) and computational structural dynamics (CSD) method is developed for the simulation and prediction of flutter, which is based on an unsteady, parallel, multiblock, multigrid finite volume algorithm for the Euler/Navier-Stokes equations.