Abstract
A novel application of the stochastic estimation procedure is used to examine the three-dimensional structure of the turbulent wake of a cylinder atx/d=100 and Re D =5000. The basis for this method is the measurements of the full 3-D correlation tensor for all components across the width of the wake. Using this large data base, events contributing most to the Reynolds stress are identified and the most likely ensemble-averaged structures corresponding to these events are reconstructed using the stochastic estimation procedure. This powerful technique offers the distinct advantage that multi-point conditional averages can readily be estimated. An extension of this multi-point conditional average estimation is presented in this paper in the form of a pseudo-dynamic reconstruction of the flow field. To that effect, measured time sequences of “conditions” at several points in the wake are used to estimate the three-dimensional structures most likely associated with these events, hence providing a useful tool to reconstruct the evolution of the large-scale flow structures.
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Supported by Office of Naval Research under Grant N00014-90-J-1499.
Supported by The OAI Space Grant Consortium.
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Gieseke, T.J., Guezennec, Y.G. Stochastic estimation of multipoint conditional averages and their spatio-temporal evolution. Appl. Sci. Res. 53, 305–320 (1994). https://doi.org/10.1007/BF00849107
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DOI: https://doi.org/10.1007/BF00849107