Investigation of the Turbulence Producing Structures in the Boundary Layer
Final rept. 1 Apr 89-31 Jan 91,
STANFORD UNIV CA THERMOSCIENCES DIV
Pagination or Media Count:
Phase A Community-wide survey of existing knowledge on turbulence producing structures in the boundary layer. Creation of a uniform nomenclature for the field. Phase B Study of questions focused by Phase A using a work station to interrogate the Direct Navier-Stokes Simulation Data Base for the Flat Plate, at R-theta 670. Results include 1 creation of the first clear picture of the spatio-temporal relations among the eight kinds of structure previously documented and their connections to regions of high and low pressure at the wall and in the flow 2 demonstration of the centrality of two types of vortices to the turbulence producing structures in the boundary layer tilted streamwise vortices in the wall layers and transverse vortices in the outer layer, and the range of overlap of the dense range of the distribution of the two vortex types is the log region 3 establishment of two computer methods for identification of vortices as distinct from lines of vorticity documentation of sizes, circulations and distributions of vortices for preliminary sample. This work establishes a basis for considering connections between knowledge of the physics and computer models of turbulence in the next phases of research.
- Fluid Mechanics