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By WS Atkins Consultants And members of the NSC

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Extra info for BEST PRACTICE GUIDELINES FOR MARINE APPLICATIONS OF COMPUTATIONAL FLUID DYNAMICS

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Code vendors and code developers should supply a list of known bugs and errors in each version of the code (hot-line, password secured web-page). This list should demonstrate that the number of bugs reduces as the code matures. 31 Best Practice Guidelines for Marine Applications of Computational Fluid Dynamics Ø The code developers should try to include warning notices and guidance for the user in the output. ) are being broken, when important specific default options are being overruled by the code input data or when the near wall grid is inconsistent with the turbulence modelling.

The ITTC 1957 correlation line). In this case the local skin friction for each panel can be calculated based on a parametric length from the leading edge or stagnation point. The form drag can be approximated by assuming that the important region for viscous shear is confined to a narrow domain next to the body and the trailing wake. The displacement thickness of the boundary layer is calculated and the corresponding panels then displaced by this amount. One problem with such formulations is that it is hard to prescribe the correct form of viscous correction equations for effects such as stern wave systems, as this is highly sensitive to hull form shape.

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.

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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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