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  • FLUID MECHANICS AND HEAT TRANSFER  (2)
  • Engineering  (1)
  • LIFE SCIENCES (GENERAL)
  • 1980-1984
  • 1975-1979  (3)
  • 1979  (3)
Collection
Keywords
Publisher
Years
  • 1980-1984
  • 1975-1979  (3)
Year
  • 1
    Electronic Resource
    Electronic Resource
    A variable thickness, curved beam and shell stiffening element with shear deformations (1979)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 14 (1979), S. 581-592 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A family of 2-D and 3-D superparametric curved beam elements are introduced as a special form of general 2-D and 3-D isoparametric continuum elements. Each beam ‘subelement’ is rectangular incross section, however several elements may be offset and overlayed for the analysis of structural members of quite general section properties. A number of examples are presented in order to illustrate the validity and range of application of the element.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620140409
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Evaluation of subgrid-scale models using an accurately simulated turbulent flow (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A calculation of periodic homogeneous isotropic turbulence is used to simulate the experimental decay of grid turbulence. The calculation is found to match the experiment in a number of important aspects and the computed flow field is then treated as a realization of a physical turbulent flow. From this flow, a calculation is conducted of the large eddy field and the various averages of the subgrid-scale turbulence that occur in the large eddy simulation equations. These quantities are compared with the predictions of the models that are usually applied in large eddy simulation. The results show that the terms which involve the large-scale field are accurately modeled but the subgrid-scale Reynolds stresses are only moderately well modeled. It is also possible to use the method to predict the constants of the models without reference to experiment. Attempts to find improved models have not met with success.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Journal of Fluid Mechanics; 91; Mar. 9
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A new approach to the solution of large, full matrix equations: A two-dimensional potential flow feasibility study (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An approach to the solution of matrix problems resulting from integral equations of mathematical physics is presented. Based on the inherent smoothness in such equations, the problem is reformulated using a set of orthogonal basis vectors, leading to an equivalent coefficient problem which can be of lower order without significantly impairing the accuracy of the solution. This approach was evaluated using a two-dimensional Neumann problem describing the inviscid, incompressible flow over an airfoil. Two different kinds of mode functions were investigated, namely eigenfunction series and Fourier series. The method using Fourier series was found preferable. It uses all of the coefficients from a Fast Fourier Transform algorithm in an approximate method which exploits the known structure of the transformed coefficient matrix and very promising results for the flow over a realistic airfoil are obtained. On the basis of the results presented here, an order of magnitude reduction in this computer time can be expected for such problems as compared with the time for a direct matrix solution.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-3173
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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