Proceedings ArticleDOI
ZONAL TWO EQUATION k-w TURBULENCE MODELS FOR AERODYNAMIC FLOWS
TLDR
In this article, two versions of the k-w two-equation turbulence model are presented, the baseline model and the Shear-Stress Transport (SSn) model.Abstract:
Two new versions of the k - w two-equation turbulence model will be presented. The new Baseline (BSL) model is designed to give results similar to those of the original k - w model of Wilcox. but without its strong dependency on arbitrary freestream values. The BSL model is identical to the Wilcox model in the inner SOC7£; of the boundary-layer but changes gradually to the standard k - f. model (in a k - w fonnulation) towards the boundary-layer edge. The new model is also virtually identical to the k - f. model for free shear layers. The second version of the model is called Shear-Stress Transport (SSn model. It is a variation of the BSL model with the additional ability to account for the transport of the principal turbulent shear stress in adverse pressure gradient boundary-layers. The model is based on Bradshaw's assumption that the principal shear-stress is pro portional to the turbulent kinetic energy, which is introduced into the definition of the eddy-viscosity. Both models are tested for a large number of different fiowfields. The results of the BSL model are similar to those of the original k - w model, but without the undesirable free stream dependency. The predictions of the SST model are also independent of the freestrearn values but show better agreement with exper imental data for adverse pressure gradient boundary-layer flows.read more
Citations
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Jet Impingement Heat Transfer: Physics, Correlations, and Numerical Modeling
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TL;DR: In this article, a review of recent impinging jet research publications identified a series of engineering research tasks that are important for improving the design and resulting performance of impinging jets: (1) clearly resolve the physical mechanisms by which multiple peaks occur in the transfer coefficient profiles, and clarify which mechanism(s) dominate in various geometries and Reynolds number regimes.
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References
More filters
Proceedings ArticleDOI
Thin-layer approximation and algebraic model for separated turbulent flows
B. Baldwin,H. Lomax +1 more
TL;DR: In this article, an algebraic turbulence model for two-and three-dimensional separated flows is specified that avoids the necessity for finding the edge of the boundary layer, and compared with experiment for an incident shock on a flat plate, separated flow over a compression corner, and transonic flow over an airfoil.
Journal ArticleDOI
The calculation of low-Reynolds-number phenomena with a two-equation model of turbulence
W.P. Jones,Brian Launder +1 more
TL;DR: In this article, the authors present numerical predictions of various turbulent shear flows in which the structure of the viscous sublayer exerts appreciable influence on the flow, where the turbulence energy and its dissipation rate are calculated by way of transport equations which are solved simultaneously with the conservation equations for the mean flow.
Journal ArticleDOI
Near-wall turbulence models for complex flows including separation
Hamn-Ching Chen,V. C. Patel +1 more
TL;DR: In this paper, the complete fully elliptic, Reynoldsaveraged Navier-Stokes equations have been solved using a low-Reynoldsnumber model, a new two-layer model, and a two-point wall-function method, in the k-s turbulence model, for the boundary layer and wake of two axisymmetric bodies.
Journal ArticleDOI
Features of a reattaching turbulent shear layer in divergent channel flow
David M. Driver,H. L. Seegmiller +1 more
TL;DR: In this article, experimental data have been obtained in an incompressible turbulent flow over a rearward-facing step in a diverging channel flow and mean velocities, Reynolds stresses, and triple products that were measured by a laser Doppler velocimeter are presented for two cases of tunnel wall divergence.
Journal ArticleDOI
The two-dimensional mixing region
Israel Wygnanski,H. E. Fiedler +1 more
TL;DR: In this paper, the mixing region can be divided into two regions, one on the outer part of a wake and the other on the low velocity side which resembles a jet, and the turbulent energy balance was constructed twice using the conventional results and again using the turbulent zone results.