This paper focuses on the implementation, validation and exploitation of a vertical dropshaft flow operation using the commercial VOF-based Computational Fluid Dynamics (CFD) code, FLOW-3D ® . Using the experimental data of Chanson (2002), the package was used to simulate the flow patterns in a rectangular dropshaft with plunge-flow pattern. Both k−ε and k−ε RNG turbulence closures were tested ...

The present work aims to define strategies for numerical simulation of the mixture turbulent flows in a stirred tank with low computational effort, and investigate influence geometry four rectangular baffles on problem performance. Two models based momentum source sliding mesh are validated by comparison experimental results from literature. For both models, time-averaged conservation equations...

Eggs released by broadcast-spawning marine invertebrates are often negatively buoyant. Blastulae and gastrulae of these species are commonly motile, with passive stability that leads to upward swimming in still water. The earliest occurrence of swimming in developing embryos of diverse invertebrates may therefore permit vertical migration in nature. I used turbulent and laminar shear flows to i...

The paper considers the problem of selecting a turbulence model to simulate natural convection near surface VVER-1000 fuel assembly unloaded from reactor by computational fluid dynamics (CFD simulation) methods. is selected comparing calculated data obtained using Ansys Fluent software package with results experimental studies on heated vertical plate immersed in water, which simulates side fac...

Different results for the cascade power ε in strong, incompressible MHD turbulence with nonzero cross helicity appear in the literature. In this paper, we discuss the conditions under which these different results are valid. Our conclusions can be expressed in terms of the density ρ, the rms amplitudes z+ and z− of Alfvénic fluctuations propagating parallel and anti-parallel to the background m...

Recent progress in understanding the balance–imbalance problem is highlighted, with emphasis on spontaneous-imbalance phenomena associated with the exponentially fast “wave capture” of inertia–gravity waves. These phenomena are excluded from shallow-water models and are outside the scope of the classical Lighthill theory. Also discussed is progress on a different topic, an effort to extend the ...