31 Aug '12, 5pm

Large Eddy Simulation (LES) of Particle-Laden Temporal Mixing Layers

High-fidelity models of plume-regolith interaction are difficult to develop because of the widely disparate flow conditions that exist in this process. The gas in the core of a rocket plume can often be modeled as a time-dependent, high-temperature, turbulent, reacting continuum flow. However, due to the vacuum conditions on the lunar surface, the mean molecular path in the outer parts of the plume is too long for the continuum assumption to remain valid. Molecular methods are better suited to model this region of the flow. Finally, granular and multiphase flow models must be employed to describe the dust and debris that are displaced from the surface, as well as how a crater is formed in the regolith. At present, standard commercial CFD (computational fluid dynamics) software is not capable of coupling each of these flow regimes to provide an accurate representation of th...

Full article: http://www.techbriefs.com/component/content/article/14256

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Mixing Cucumber with Test::Unit/Shoulda - GIANT...

robots.thoughtbot.com 01 Sep '12, 5am

February 20, 2009 Comments (View) Mixing Cucumber with Test::Unit/Shoulda I don’t know if cucumber is a fruit or vegetable...