13 research outputs found

    Wind tunnel study of the Dugway Proving Ground tower grid

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    November 1970.CER69-70 JA-ECN39.Contract no. DAAB07-68-C-0423.DTC project no. DTC-TR-72-606

    A systems approach to theoretical fluid mechanics: Fundamentals

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    A preliminary application of the underlying principles of the investigator's general system theory to the description and analyses of the fluid flow system is presented. An attempt is made to establish practical models, or elements of the general fluid flow system from the point of view of the general system theory fundamental principles. Results obtained are applied to a simple experimental fluid flow system, as test case, with particular emphasis on the understanding of fluid flow instability, transition and turbulence

    Computer study of transition of wall boundary layers, A

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    January 1972.CER71-72JCA-RNM21.Includes bibliographical references

    Effective-viscosity model for turbulent wall boundary layers, An

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    CER70-71JCA-RNM63.Includes bibliographical references (pages 15-16).Prepared under Office of Naval Research contract no. N00014-68-A-0493-0001; project no. NR 062-414/6-6-68 (Code 438).June 1971.Existing effective viscosity models which have been very valuable in the mean field closure method for turbulent boundary layer computation have shown certain undesirable limitations for certain realistic but general boundary layer flows. The more general flows usually involve non-negligible considerations of pressure gradients and such wall conditions as roughness, curvature and aspiration or transpiration in varying degrees of importance. The effects of these external and wall influences have, unfortunately, been underplayed by most existing effective viscosity models. The present model of the effective viscosity is developed for a general flow and has shown remarkable agreement with experimentation, without being any more complex than existing models
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