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Ship's Log -
Engineering
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15/03/2016 |
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 The ability of accurately predicting transitional fluid flow behavior is important to the design of many engineering systems. From a design standpoint, Reynolds Averaged Navier-Stokes based CFD represents a reasonable compromise between accuracy and expense. More recent research efforts for RANS based CFD have focused on models specifically developed to predict transitional behavior.
The k-kl-omega model is a new transitional turbulence model which is described in [1]. However in 2013 it is appeared that this paper has several errors which must be corrected. In OpenFOAM these corrections have been applied with the version 2.4.0 and later.
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Ship's Log -
Engineering
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28/07/2015 |
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 Prolate spheroids can be considered as simple geometries. On the other hand the flow around a prolate spheroid at incidence offers a complex three-dimensional turbulent shear flows, featuring stagnation flow, a highly three-dimensional boundary layer, cross-flow separation, the formation and evolution of free-vortex sheets and stream-wise vortices etc.
Since these flow features are important in the area of aerodynamic and hydrodynamic design of vehicles, they have been the basis of much research over the years and many experimental studies have provided comprehensive data that reveals the salient physics of these king of flows specially for 3:1 and 6:1 prolate spheroids. The 6:1 case has been most widely researched though.
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