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  • 1
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    Interacting steady states in thermohaline convection (1987)
    American Physical Society
    Details
    Publication Date: 1987-12-01
    Print ISSN: 0556-2791
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Physical Society
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    PAPER CURRENT
  • 2
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    SOME RECENT RESULTS ON THE BUCKLING MECHANISM OF SPHERICAL CAPS (1962)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Buckling mechanism of spherical caps - dependence on boundary conditions
    Keywords: THERMODYNAMICS AND COMBUSTION
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A new asymptotic method for jump phenomena (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Physical phenomena involving rapid and sudden transitions, such as snap buckling of elastic shells, explosions, and earthquakes, are characterized mathematically as a small disturbance causing a large-amplitude response. Because of this, standard asymptotic and perturbation methods are ill-suited to these problems. In the present paper, a new method of analyzing jump phenomena is proposed. The principal feature of the method is the representation of the response in terms of rational functions. For illustration, the method is applied to the snap buckling of an elastic arch and to a simple combustion problem.
    Keywords: PHYSICS (GENERAL)
    Type: SIAM Journal on Applied Mathematics; 39; Dec. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    A nonlinear structural concept for compliant walls (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Two mechanisms of drag reduction for flow over flat plates were investigated. The first mechanism employs Bushnell's hypothesis that compliant walls produce drag reduction by interfering with the formation of the turbulent spots in a turbulent boundary layer. It is shown that the amplitudes and frequencies of compliant wall motions for drag reduction might be achieved by using slightly curved walls and the resulting large amplitude motions of snap buckling. A simple structural model of an arch is used in the analysis, and an asymptotic method is developed. The required wall motions can be obtained by using materials like mylar. In addition, the delay of transition from laminar to turbulent flow by driven walls was studied for Poiseuille channel flow. The walls are driven by a periodic traveling wave. A significant increase in the transitional Reynolds number is obtained by appropriately prescibing the wavelength and phase velocity of the wall motion. Previously developed asymptotic methods are used in the analysis.
    Keywords: AERODYNAMICS
    Type: NASA-CR-3628 , NAS 1.26:3628
    Format: application/pdf
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  • 5
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    A nonlinear structural concept for drag-reducing compliant walls (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Two mechanisms of drag reduction for flow over flat plates were investigated. The first mechanism employs Bushnell's hypothesis that compliant walls produce drag reduction by interfering with the formation of the turbulent spots in a turbulent boundary layer. It is shown that the amplitudes and frequencies of compliant wall motions for drag reduction might be achieved by using slightly curved walls and the resulting large amplitude motions of snap buckling. A simple structural model of an arch is used in the analysis, and an asymptotic method is developed. The required wall motions can be obtained by using materials like mylar. In addition, the delay of transition from laminar to turbulent flow by driven walls was studied for Poiseuille channel flow. The walls are driven by a periodic traveling wave. A significant increase in the transitional Reynolds number is obtained by appropriately prescribing the wavelength and phase velocity of the wall motion. Previously developed asymptotic methods are used in the analysis. Previously announced in STAR as N83-11061
    Keywords: AERODYNAMICS
    Type: AIAA Journal (ISSN 0001-1452); 22; 399-402;
    Format: text
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  • 6
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    Jump phenomena (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The paper considers jump phenomena composed of large amplitude responses of nonlinear systems caused by small amplitude disturbances. Physical problems where large jumps in the solution amplitude are important features of the response are described, including snap buckling of elastic shells, chemical reactions leading to combustion and explosion, and long-term climatic changes of the earth's atmosphere. A new method of rational functions was then developed which consists of representing the solutions of the jump problems as rational functions of the small disturbance parameter; this method can solve jump problems explicitly.
    Keywords: PHYSICS (GENERAL)
    Type: Nonlinear partial differential equations in engineering and applied science; Jun 04, 1979 - Jun 08, 1979; Kingston, RI
    Format: text
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