Modeling of wall-bounded complex flows and free shear flows
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Modeling of wall-bounded complex flows and free shear flows

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Published by National Aeronautics and Space Administration, Lewis Research Center, Institute for Computational Mechanics in Propulsion, National Technical Information Service, distributor in [Cleveland, Ohio], [Springfield, Va .
Written in English

Subjects:

  • Eddy viscosity.,
  • Jet flow.,
  • Mathematical models.,
  • Separation.,
  • Shear flow.,
  • Stress analysis.,
  • Turbulence models.,
  • Turbulent flow.,
  • Wall flow.

Book details:

Edition Notes

Other titlesModeling of wall bounded complex flows and free shear flows.
StatementTsan-Hsing Shih, Jiang Zhu, John L. Lumley.
SeriesNASA technical memorandum -- 106513.
ContributionsChu, Chiang., Lumley, John L. 1930-, Lewis Research Center. Institute for Computational Mechanics in Propulsion.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL18078579M

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  Various wall-bounded flows with complex geometries and free shear flows have been studied with a newly developed realizable Reynolds stress algebraic equation model. The model development is based on the invariant theory in continuum mechanics. This theory enables us to formulate a general constitutive relation for the Reynolds stresses. Pope was the first to introduce this Cited by: 2. Get this from a library! Modeling of wall-bounded complex flows and free shear flows. [Tsan-Hsing Shih; Jiang Zhu; John L Lumley; Lewis Research Center. Institute for . Various wall‐bounded flows with complex geometries and free shear flows have been studied with a newly developed realizable Reynolds stress algebraic equation model. The model development is based on the invariant theory in continuum mechanics. This theory enables us to formulate a general constitutive relation for the Reynolds stresses. Pope (J. Fluid Mech., 72, – ()) was the. Cite this paper as: Viti V., Huang G., Bradshaw P. () Comparative Study of Reynolds Stress Turbulence Models in Free-Shear and Wall-Bounded Flows.

An analysis is given of a secondary instability that obtains in a wide class of wall-bounded parallel shear flows, including plane Poiseuille flow, plane Couette flow, flat-plate boundary layers, and pipe Poiseuille flow. Turbulent shear flows have traditionally been classified into two main categories: free shear layers and wall-bounded flows. For free shear flows, jets, mixing layers, and wakes can be viewed as the building blocks of more complex flow configurations of engineering interest. These flows are relatively insensitive to low Reynolds number effects. The Fourth International Symposium on Turbulent Shear Flows took place at Karlsruhe University in Germany. The papers presented at this Symposium encompassed a similar range to that of the previous meetings, with greater emphasis placed on experimental work, and continued a trend towards the examination of complex flows.   The efficacy of large-eddy simulation (LES) with wall modeling for complex turbulent flows is assessed by considering turbulent boundary-layer flows past an asymmetric trailing-edge. Wall models based on turbulent boundary-layer equations and their simpler variants are employed to compute the instantaneous wall shear stress, which is used as approximate boundary conditions for the LES.

models is crucial in numerical simulations of two-phase flow problems [3]. Especially, the shear-induced lift and wall-induced force play an important role of determining the distribution of void fraction in wall-bounded bubbly flows. The shear-induced lift is generated due to the interaction of the bubble with the shear field of the liquid. Model the nonlinear instability of wall-bounded shear flows as a rare event: a study on two-dimensional Poiseuille flow Xiaoliang Wan1,4, Haijun Yu2 and E Weinan3 1 Department of Mathematics, Louisiana State University, Baton Rouge, LA , USA 2 Institute of Computational Mathematics, Academy of Mathematics and Systems Science. Turbulent wall-bounded flows (i.e., boundary layer, pipe and channel flows) present additional measurement challenges relative to those in, say, free shear turbulent flows or grid turbulence. The physical presence of the wall and the limitations and influences it presents on the implementation of sensing technologies creates some of these. Failure of classical linear stability analysis for wall-bounded shear flows. x Classical theory assumes 2D disturbances. x Experiments suggest transition to more complex flow is inherently 3D: streamwise streaks. Flow type. Classical prediction. Experiment. Plane Poiseuille. ~ Plane Couette. ñ ~ Pipe flow. ñ ~ x.