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  • Fluid Mechanics and Heat Transfer  (2)
  • FLUID MECHANICS AND HEAT TRANSFER  (1)
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  • 1
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    Optimum Transonic Airfoils Based on the Euler Equations (1996)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: We solve the problem of determining airfoils that approximate, in a least square sense, given surface pressure distributions in transonic flight regimes. The flow is modeled by means of the Euler equations and the solution procedure is an adjoint- based minimization algorithm that makes use of the inverse Theodorsen transform in order to parameterize the airfoil. Fast convergence to the optimal solution is obtained by means of the pseudo-time method. Results are obtained using three different pressure distributions for several free stream conditions. The airfoils obtained have given a trailing edge angle.
    Keywords: Fluid Mechanics and Heat Transfer
    Type: NASA-CR-201638 , NAS 1.26:201638 , ICASE-96-76
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Entropy jump across an inviscid shock wave (1995)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The shock jump conditions for the Euler equations in their primitive form are derived by using generalized functions. The shock profiles for specific volume, speed, and pressure are shown to be the same, however density has a different shock profile. Careful study of the equations that govern the entropy shows that the inviscid entropy profile has a local maximum within the shock layer. We demonstrate that because of this phenomenon, the entropy, propagation equation cannot be used as a conservation law.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-195046 , NAS 1.26:195046 , ICASE-95-12
    Format: application/pdf
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  • 3
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    On the Propagation of Small Perturbations in Two Simple Aeroelastic Systems (1998)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: In this paper we investigate the wave propagation patterns for two simple flow-structure problems. We focus on the study of the propagation speeds of the waves in the fluid and in the structure, as the rigidity of the structure and the Mach number of the undisturbed flow are changing. Some implications concerning the sound emission by inhomogeneities eventually present in the structure are discussed.
    Keywords: Fluid Mechanics and Heat Transfer
    Type: NASA/CR-1998-208457 , NAS 1.26:208457 , ICASE-98-30
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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