Journal ArticleDOI
A Wall-Distance-Free k-ε Model With Enhanced Near-Wall Treatment
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In this paper, a wall-distance-free low-Re κ-e turbulence closure model was proposed to improve the prediction of adverse pressure gradient flows, including those involving separated flows regions.Abstract:
We evaluate a wall-distance-free low-Re κ-e turbulence closure model which Incorporates an extra source term in the e transport equation designed to increase the level of e in nonequilibrium flow regions, thus reducing the kinetic energy and length scale magnitudes to improve prediction of adverse pressure gradient flows, including those involving separated flows regions. Two such cases are used here to test the model: one in the low speed flow regime, the other a supersonic one. Comparisons with experimental data and with an earlier version of the κ-e model, as well as with a variant of the κ-ω model (both also wall-distance-free) reveal that the proposed model enables improved prediction of adverse pressure gradient flows relative to more traditional κ-e modelsread more
Citations
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Improved Rhie-Chow Interpolation for Unsteady Flow Computations
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Sub-grid turbulence modeling for unsteady flow with acoustic resonance
TL;DR: In this article, a combination of Reynoldsaveraged Navier-Stokes (RANS) and large-eddy simulation (LES) sub-grid models is proposed, which combines the best features of time-averaged and spatially filtered models, yielding the superior near-wall stress predictions of (algebraic or full-transport) Reynolds-stress models with the ability to override any quasi-steady grid-converged RAN's model solution in regions of sufficiently high grid density.
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Experimental determination of heat transfer and friction in helically-finned tubes
TL;DR: In this article, heat transfer coefficients and friction factors were determined experimentally for eight helically-finned tubes and one smooth tube using liquid water at Reynolds numbers ranging from 12,000 to 60,000.
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Numerical Study of Plane and Round Impinging Jets using RANS Models
TL;DR: In this paper, different impinging jet configurations are studied by means of time-averaged Navier-Stokes simulations, and results from numerical simulations, using different models, are compared among them and with experimental data available in the literature.
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Navier-Stokes Computations for a Spinning Projectile from Subsonic to Supersonic Speeds
TL;DR: In this paper, a computational study has been undertaken to predict the static-aerodynamic, Magnus-moment, and roll-damping coefficients of a standard spinning projectile using a single, modern, unstructured Navier-Stokes flow solver.
References
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Viscous Fluid Flow
TL;DR: In this article, the stability of Laminar Boundary Layer Flow Appendices has been investigated in Cylindrical and Spherical Coordinates of Incompressible Newtonian Fluids.
The Structure of Turbulence in Fully Developed Pipe Flow
TL;DR: In this paper, a hot-wire anemometer was used to measure the turbulent flow in a 10-inch pipe at speeds of approximately 10 and 100 feet per second, and the results include relevant mean and statistical quantities, such as Reynolds stresses, triple correlations, turbulent dissipation, and energy spectra.
Journal ArticleDOI
A Modified Form of the k-ε Model for Predicting Wall Turbulence
C. K. G. Lam,Klaus Bremhorst +1 more
Journal ArticleDOI
Reynolds-stress and dissipation-rate budgets in a turbulent channel flow
TL;DR: In this article, the Reynolds stresses and the dissipation rate of the turbulence kinetic energy are computed using direct simulation data of a turbulent channel flow using a closed-loop model, where the budget data reveal that all the terms in the budget become important close to the wall.