This paper presents a numerical study of heat transfer to turbulent and laminar Cu/water flow over a backward-facing step. Mathematical model based on finite volume method with a FORTRAN code is used to solve the continuity, momentum, energy and turbulence equations. Turbulence was modeled by the shear stress transport (SST) K–x Model. In this simulation, three volume fractions of nanofluid (0%...

The analysis of impeller shape performance was carried out with the SST (Shear-Stress Transport) model coupled with the streamline curvature turbulence model. This model combines the advantages from the κ−ε and κ−ω models, ensuring proper relation between turbulent stress and turbulent kinetic energy and allowing accurate and robust prediction of the impeller blade flow separation. The Multiple...

This study presents the first results of a new turbulence model implementation in our compressible finite volume CFD solver. The k - kL is one newest two-equation models, and it based on ideas Rotta’s model. Various research groups progressively develop model, maturing rapidly. Reports suggest that provides superior compared to other models specific problems. improved solutions are observed mai...

Flow separation at water intake is the main cause of head loss and flow discharge reduction. As a result, study of shape and size of separation is very essential when designing an optimum water intake. Water intake is normally built with a 90 degree angle to the main channel flow direction. However, the flow structure in this type of water intake consists of large separation size along with ...

To analyze the influence of tapered form two upper vertices a rectangular cube placed in channel and impact insertion hollow center obstacle, three-dimensional study was executed using K-ω SST turbulence model. Different models were presented to examine features flow with Reynolds number Re=4×104. The kinetic energy, 2D 3D time-averaged streamlines, trace-lines, streamwise velocity profiles, pr...

Thermal jet flows are the type of flow frequently encountered in engineering applications. This article aims to determine if SST k-ω turbulence model, including Low-Reynold Correction, accurately estimates Nusselt number impinging flow; because this, computational results were compared with experimental studies. comparison was made on a line (r/D) from stagnation point exit. In this article, he...

In this work, we investigate the flow field around speed skating helmets and their associated aerodynamic drag by means of computational fluid dynamics (CFD) simulations. An existing helmet frequently used in competition was taken as a baseline. Six additional designs, well bare-head configuration, were analysed. All numerical simulations performed via 3D RANS using SST k-ω turbulence model. Th...

The paper shows the results of the convective heat transfer prediction in turbulent axisymmetric jets impinging onto a flat plate using the newest version (2006) of the k-ω turbulence model of Wilcox [1]. Improvements to the heat transfer predictions are obtained in the strongly strained flow regions with the impingement invariant proposed by Manceau [2] together with the F1 function proposed b...

In this study, the aerodynamic analysis of Ahmed body which is generic automobile model performed to determine convenient turbulence and reduce drag coefficient by modifying shape model. For purpose, Computational Fluid Dynamics (CFD) carried out using different models that are Spalart-Allmaras, (Shear Stress Transport) SST k-ω, Standard k-ε, Realizable (Re-Normalisation Group) RNG k-ε models. ...

Abstract In order to study the influence of deformations nozzle’s flexible sections on its inner wall’s heat transfer, this research uses two-dimensional axisymmetric model and k − ω SST turbulence numerically analyze tail flow field flexible-extendible nozzle under multiple working conditions. The transfer with without are simulated analyzed. simulation results show that when deformed, new sho...