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Structure and Mixing in Turbulent Shear Flows

Roshko, Anatol (1985) Structure and Mixing in Turbulent Shear Flows. In: 1985 AFOSR/ONR Contractors Meeting on Turbulent Combustion 23-35 July 1985. California Institute of Technology , Pasadena, CA, pp. 104-106.

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The broad problem being addressed in our research is to identify and describe the primary vortical ("coherent", "organized") large structures in various turbulent shear flows; to determine how they contribute to the mixing processes; and to make use of them in modelling and in possibly controlling or modifying those flows. Accumulating experimental evidence suggests that these primary vortical structures are different in different shear flows. Conclusions which follow from these views are that (i) there cannot be a universal turbulence model for these different flows; and (ii) existence of such structures implies the possibility of their manipulation or control and thus modification of the flow itself. These organized structures (and their response to excitation) are manifestations of instability response to natural or imposed disturbances and thus may be important in cooperation with other, physical processes, e.g. , acoustic coupling, rate controlled chemistry, etc., in problems like combustion chamber instability.

Item Type:Book Section
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Additional Information:ONR Contract No. N00014-76-C-0260 Task No. NR 062, 431
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Office of Naval Research (ONR)N00014-76-C-0260
Record Number:CaltechAUTHORS:20141114-143226217
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51796
Deposited On:15 Nov 2014 00:57
Last Modified:03 Oct 2019 07:36

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