Abstract Numerical modeling of the outflow an air jet into water with a guillotine rupture pipeline by VOF method using k-ε and k-ω SST turbulence models was carried out. The calculations were out in axisymmetric approximation. following phases process calculated: formation large gas bubble at place rupture, its growth, separation from behind bubble. It is shown that rate detachment model highe...

A wall–distance–free version of the Spalart–Allmaras (SA) one–equation model is proposed to account for the distinct effects of low-Reynolds number (LRN) and wall proximity. The turbulent kinetic energy k and the dissipation rate ǫ are evaluated using the ν̃t–transport equation together with some empirical relations. The model coefficients/functions preserve the anisotropic characteristics of tu...

Abstract The accuracy of wind flow simulation in mountain area micro-topography is related to discrete scheme, turbulence model and wall function. In this paper, the standard hill adopt analyze calculation different models. Four models, including RNG k-ε, k-ω , SST TSST were used calculation, compared with result tunnel test. results second-order upwind or scalable function are basically consis...

The drops are used to control the descents,  stabilize the bed level, and control the upstream water level in sloping channels with less slope than the ground slope. The current study presents a numerical analysis of hydraulic characteristics in the vertical drop using computational fluid dynamics. At first, the laboratory models were used for verification and choosing the best model of turbule...

UNLABELLED Accurate prediction of ventilation flow is of primary importance for designing a healthy, comfortable, and energy-efficient indoor environment. Since the 1970s, the use of computational fluid dynamics (CFD) has increased tremendously, and nowadays, it is one of the primary methods to assess ventilation flow in buildings. The most commonly used numerical approach consists of solving t...

In the present work two turbulence modeling approaches, namely Large Eddy Simulation and Detached Eddy Simulation, are employed to predict the turbulent, swirling flow within an industrial cyclone separator running at Reynolds number 267,000. The results from three LES models, Smagorinsky, dynamic and Yakhot, and the SST-DES model of Strelets have been compared to experimental results for the a...

Three different geometries have been used in this study, which investigated the effect of inclination angle on convective heat transfer corrugated channels. The channel angles 30°, 45°, and 60°. finite volume method has study with numerical methods. k-?, SST, transition SST as turbulence models. mesh file analysis consists 192000 cells. results obtained from calculations using a 30° compared ex...

Numerical simulations are performed using a Reynolds-averaged Navier-Stokes (RANS) flow solver for a circulation control airfoil. 2D and 3D simulation results are compared to a circulation control wind tunnel test conducted at the NASA Langley Basic Aerodynamics Research Tunnel (BART). The RANS simulations are compared to a low blowing case with a jet momentum coefficient, Cμ, of 0.047 and a hi...

Abstract Turbulence models are considered one of the most important sources numerical errors in CFD studies on different aeronautical problems. The mesh type can also affect accuracy and computational efficiency. In this paper, various simulations store separation from an aircraft model transonic flow have been carried out by coupling rigid body dynamics overset mesh. influence S-A model, Stand...

The well-known Shear Stress Transport (SST k–ω) turbulence model was modified and examined. Two industrially relevant problems with curved rotating channels have been selected to assess the modification potential: a lid in confined cylinder swirling flow through three-dimensional abrupt expansion pipe. postulated amendment simplified rotation curvature correction term that suggested earlier by ...