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  • FLUID MECHANICS AND HEAT TRANSFER  (6)
  • 1
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    Computational aspects of heat transfer in structures via transfinite element formulations (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The paper presents a generalized Transform Method based Finite Element methodology for thermal analysis with emphasis on the computational aspects of heat transfer in structures. The purpose of this paper is to present an alternate methodology for thermal analysis of structures and therein outline the advantages of the approach in comparison with conventional finite element schemes and existing practices. The overall goals of the research, however, are aimed first toward enhanced thermal formulations and therein to provide avenues for subsequent interdisciplinary thermal/structural analysis via a common numerical methodology. Basic concepts of the approach for thermal analysis is described with emphasis on a Laplace Transform based finite element methodology. Highlights and characteristic features of the approach are described via generalized formulations and applications to several problems. Results obtained demonstrate excellent agreement in comparison with analytic and/or conventional finite element solutions with savings in computational times and model sizes. Potential of the approach for interdisciplinary thermal/structural problems are also identified.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 86-0147
    Format: text
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  • 2
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    Applicability/evaluation of flux based representations for linear/higher order elements for heat transfer in structures - Generalized gamma(T)-family (1991)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The applicability and evaluation of a generalized gamma(T) family of flux-based representations are examined for two different thermal analysis formulations for structures and materials which exhibit no phase change effects. The so-called H-theta and theta forms are demonstrated for numerous test models and linear and higher-order elements. The results show that the theta form with flux-based representations is generally superior to traditional approaches.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 91-0159
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  • 3
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    Exact finite elements for conduction and convection (1981)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: An appproach for developing exact one dimensional conduction-convection finite elements is presented. Exact interpolation functions are derived based on solutions to the governing differential equations by employing a nodeless parameter. Exact interpolation functions are presented for combined heat transfer in several solids of different shapes, and for combined heat transfer in a flow passage. Numerical results demonstrate that exact one dimensional elements offer advantages over elements based on approximate interpolation functions. Previously announced in STAR as N81-31507
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Numerical methods in thermal problems. Volume 2 Second International Conference; Jul 07, 1981 - Jul 10, 1981; Venice; Italy
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  • 4
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    Further development towards a new virtual-pulse time integral methodology for general nonlinear transient thermal analysis (1993)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: New developments describing the theoretical basis towards an effective virtual-pulse time integral procedure are presented for general nonlinear transient heat transfer problems. To validate the proposed methodology of computation, numerical test examples are given and comparisons are drawn with the implicit second-order accurate Crank-Nicolson technique. The proposed method shows superior or improved accuracy and stability characteristics for the models tested.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 93-0594 , AIAA, Aerospace Sciences Meeting and Exhibit; Jan 11, 1993 - Jan 14, 1993; Reno, NV; United States|; 8 p.
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  • 5
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    Exact finite elements for conduction and convection (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An approach for developing exact one dimensional conduction-convection finite elements is presented. Exact interpolation functions are derived based on solutions to the governing differential equations by employing a nodeless parameter. Exact interpolation functions are presented for combined heat transfer in several solids of different shapes, and for combined heat transfer in a flow passage. Numerical results demonstrate that exact one dimensional elements offer advantages over elements based on approximate interpolation functions.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-164723 , Intern. Conf. on Numerical Methods in Thermal Probl.,; Jul 07, 1981 - Jul 10, 1981; Venice; Italy
    Format: application/pdf
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  • 6
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    Integrated transient thermal-structural finite element analysis (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An integrated thermal structural finite element approach for efficient coupling of transient thermal and structural analysis is presented. Integrated thermal structural rod and one dimensional axisymmetric elements considering conduction and convection are developed and used in transient thermal structural applications. The improved accuracy of the integrated approach is illustrated by comparisons with exact transient heat conduction elasticity solutions and conventional finite element thermal finite element structural analyses.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-83125 , AIAA Struct. Dyn. Spec. Meeting,; Apr 09, 1981 - Apr 10, 1981; Atlanta, GA; United States
    Format: application/pdf
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