Stochastic Estimation of Coherent Structures and Their Dynamics in Transitional and Turbulent Boundary Layers
Abstract
The structure of transitional and turbulent boundary layers was investigated experimentally using the stochastic estimation technique. The two- point space-time full correlation tensor was measured at various Reynolds numbers in the near wall region of a boundary layer, and the outer region of a regular and LEBU manipulated boundary layer. It was found that multi-point stochastic estimates yield a far more realistic picture of the turbulent structures than conventional one-point conditional averages. A new technique was developed, whereby the pseudo-dynamic evolution of the flow field is reconstructed by means of the stochastic estimation for a measured time sequence of velocity at one or more points. This yields a very realistic kinematic evolution of the flow structures. Prospects for deriving dynamical evolution equations for the stochastic estimates have also been explored.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 24, 1991
- Accession Number
- ADA236231
Entities
People
- N. Trigui
- T. J. Gieseke
- Y. G. Guezennec
Organizations
- Ohio University