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  • AERODYNAMICS  (3)
  • 1990-1994  (3)
  • 1970-1974
  • 1992  (3)
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  • AERODYNAMICS  (3)
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  • 1990-1994  (3)
  • 1970-1974
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  • 1
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    Some recent applications of Navier-Stokes codes to rotorcraft (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Many operational limitations of helicopters and other rotary-wing aircraft are due to nonlinear aerodynamic phenomena incuding unsteady, three-dimensional transonic and separated flow near the surfaces and highly vortical flow in the wakes of rotating blades. Modern computational fluid dynamics (CFD) technology offers new tools to study and simulate these complex flows. However, existing Euler and Navier-Stokes codes have to be modified significantly for rotorcraft applications, and the enormous computational requirements presently limit their use in routine design applications. Nevertheless, the Euler/Navier-Stokes technology is progressing in anticipation of future supercomputers that will enable meaningful calculations to be made for complete rotorcraft configurations.
    Keywords: AERODYNAMICS
    Type: California State Univ., The Fifth Symposium on Numerical and Physical Aspects of Aerodynamic Flows; 15 p
    Format: application/pdf
    Location Call Number Expected Availability
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  • 2
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    Navier-Stokes analysis of blunt trailing edge airfoils (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The flow around blunt trailing edge airfoils was studied by solving the Reynolds-averaged Navier-Stokes equations. The solution procedure combines a grid around the airfoil with a second grid for the wake so that the time advancement over the domain is fully implicit. This is not only very efficient for the algorithm but also allows implicit solutions of a one equation turbulence model appropriate for both boundary layers and wakes. An algebraic and two one-equation turbulence models are tested for a blunt RAE 2822 airfoil section and detailed comparisons with experimental data are presented in the trailing edge region.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 92-0024
    Format: text
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  • 3
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    Flowfield of a lifting rotor in hover - A Navier-Stokes simulation (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The viscous, three-dimensional flowfield of a lifting helicopter rotor in hover is calculated by using an upwind, implicit, finite-difference numerical method for solving the thin layer Navier-Stokes equations. The induced effects of the wake, including the interaction of tip vortices with successive blades, are calculated as part off the overall flowfield solution without using any ad hoc wake models. Comparison of the numerical results for the subsonic and transonic conditions show good agreement with the experimental data and with the previously published Navier-Stokes calculations using a simple wake model. Some comparisons with Euler calculations are also presented, along with some discussions of the grid refinement studies.
    Keywords: AERODYNAMICS
    Type: AIAA Journal (ISSN 0001-1452); 30; 10; 2371-237
    Format: text
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