The present work studied various models for predicting turbulence in the problem of injecting a fluid microjet into boundary layer turbulent flow. For this purpose, one-equation Spalart–Allmaras (SA), two-equation k–ε and k–ω, multi-equation transition k-kL–ω, shear stress transport (SST), Reynolds were used solving steady layer, their results are compared with experimental results. Comparing i...

The present work focuses on the comparison of numerical simulation sheet/cloud cavitation with Reynolds Average Navier-Stokes and Large Eddy Simulation(RANS LES) methods around NACA0012 hydrofoil in water flow. Three kinds turbulence models—SST k-?, modified SST Smagorinsky’s model—were used this paper. unstable sheet cavity periodic shedding were predicted, results, namelycavitation shape, fre...

Two promising designs of counterflow vortex reactor were numerically investigated. Such apparatus utilizes reverse flow to withdraw thermal energy and products from interelectrode area. Complex gasdynamic structure the water-vapor was investigated using turbulent three-dimensional simulation employing Reynolds averaged Navier-Stokes equations along with SST k turbulence model technique tested i...

In the present study, flow characteristics of butterfly valves with different sizes DN 80 (nominal diameter: 76.2 mm), 262 254 400 406 mm) were numerically investigated under valve opening percentages. Representative two-equation turbulence models k-epsilon model Launder and Sharma, k-omega Wilcox, SST Menter selected. Flow examined to determine effects. It was determined that increasing effect...

There are a number of systems in which supercritical cryogenic fluids are used as coolants or propellant fluids. In some modern military aircraft, the fuel is pressurized above its critical point and used as a coolant to remove heat from the aircraft engine. Accurate prediction of heat transfer coefficients to turbulent flows of supercritical fluids is essential in design of such systems. One o...

The present study reported of the numerical investigation of a high-speed wet steam flow through an asymmetric nozzle. The spontaneous non-equilibrium homogeneous condensation of wet steam was numerically modeled based on the classical nucleation theory and droplet growth rate equation combined with the field conservations within the computational fluid dynamics (CFD) code of ANSYS Fluent 13.0....

To select a more suitable turbulence model to study tire aerodynamics, the characteristics of deformed profile 185/65 R14 passenger were reproduced using 3D printing technology. Based on distance from automobile chassis ground, partially loaded with height 150 mm was selected in this paper, and surface pressure coefficient determined wind tunnel test. A computational fluid dynamics (CFD) establ...

Article history: Available online 30 October 2010