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By WS Atkins Consultants And members of the NSC

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The main parameter which gives a preview of the symmetrical behaviour is the Reynolds number. If the Reynolds number is high the flow tends to be asymmetric. This asymmetry can also be forced if the real inflow conditions are not geometrically perfectly symmetrical or some distortions are within the inlet flow. g. the Karman vortex-street) or due to time-dependent boundary conditions the flow field can be unsteady. This effect should be carefully examined because the flow solvers can often compute a spurious steady solution of 47 Best Practice Guidelines for Marine Applications of Computational Fluid Dynamics the flow field that is in contradiction to the physics.

Guidelines A CFD user for non-routine applications should have good training and knowledge in classical fluid mechanics, a broad understanding of numerical methods, and detailed knowledge of the application being examined. g. turbulence, radiation, buoyancy driven flows). The training and education requirement for more routine applications can be less stringent, provided that clear guidelines or procedures have been established for the use of the code being used. An example of a routine application would be the simulation of a standard component in a design environment where many previous designs have been calculated and only relatively small changes in geometries and boundaries conditions occur.

The standard k-ε and RSM models cannot. Various so-called lowReynolds number versions of the k-ε and RSM models have been proposed incorporating modifications which remove this limitation (Patel et al. [1985] and Wilcox [1998]). Alternatively 42 Best Practice Guidelines for Marine Applications of Computational Fluid Dynamics the standard k-ε and RSM models can be used in the interior of the flow and coupled to the kL model which is used to resolve just the wall region. This is known as a two-layer model.

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BEST PRACTICE GUIDELINES FOR MARINE APPLICATIONS OF COMPUTATIONAL FLUID DYNAMICS by WS Atkins Consultants And members of the NSC


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