Non-equilibrium turbulence considerations from rapid distortion theory have been utilized to derive a correction to the turbulence dissipation rate, which then has been implemented in combination with the RNG k-epsilon model in a KIVA-based code. This correction reflects the time delay between changes in the turbulent kinetic energy due to changes in the mean flow and its turbulence dissipation...

In recent years, energy consumption from electrical devices to foster air movement in regions with warm climates has risen, the resulting negative impact on environment. The purpose of this paper is evaluate performance a solar chimney used induce natural ventilation closed space, under weather conditions hot humid Mexican climate. For purpose, CFD simulations were run using RNG k- ɛ turbulence...

The results of computational and experimental studies a model hypersonic convergent air intake are presented. Experimental were carried out in hot-shot wind tunnel IT-302M SB RAS at Mach number M = 5.7 an angle attack α 4 °. Numerical modeling was three-dimensional setting the ANSYS Fluent software package. calculations versions using different turbulence models: k- ɛ standard, RNG ɛ, ɷ standar...

Dairesel başlıklı savaklar akım ölçümleri için yaygın olarak kullanılan su yapılarıdır. Dikdörtgen kesitli savak profillerine göre genellikle daha yüksek debi katsayılarına sahip oldukları bilinen bu tür savaklar, yapısını az rahatsız etme özelliğine dikdörtgen savaklara kıyasla avantajlıdır. Bu çalışmada, dairesel savakların etrafındaki akımın hız alanı, basınç dağılımı, çizgileri ve vektörler...

European countries are required to look for alternative gas suppliers deliver energy security Europe. Qatar has been proposed be an supplier; however, there problems that limit from exporting more Europe, namely: the limited LNG quantities available export, long-term fixed contracting strategy, and lack of room receive additional in terminals. As these critical this research aims propose potent...

In order to study the influence of ventilating cavitation flow at shoulder a submerged-launched vehicle on surface hydrodynamic characteristics, three-dimensional potential model for ventilation was established based homogeneous multiphase theory, standard RNG k- ε model, Singhal and overlapping grid technology, numerical simulation unsteady evolution process ventilated carried out, morphology ...

The rotation speed of water at the inlet low hump outlet conduit has a great effect on its hydraulic performance. Therefore, influence different speeds loss and flow pattern is studied in this paper. By solving RANS equations RNG k-ε turbulence model, 3D field were calculated under speeds. To verify numerical results, model tests with guide vanes conducted. results show that along growth speed,...

Intense fluid-dynamic interaction at the impeller outlet strongly affects unsteady flow and pressure stability within centrifugal pump. In order to have a better understanding of fluctuation pumps, numerical calculation is carried out by using RNG k-epsilon turbulence model under various rates. The results are compared with experimental in verify reliability model. amplitude frequency distribut...