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Download BEST PRACTICE GUIDELINES FOR MARINE APPLICATIONS OF by WS Atkins Consultants And members of the NSC PDF

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By WS Atkins Consultants And members of the NSC

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A typical example is the specification of the turbulence properties 45 Best Practice Guidelines for Marine Applications of Computational Fluid Dynamics (turbulence intensity and length scale) at the inlet flow boundary, as these are practically arbitrary in marine CFD. However, for special cases such as propeller or water jet flows the user needs to be aware of these problems and needs to develop a good feel for the certainty or uncertainty of the boundary conditions that are imposed. This can best be achieved if the user knows and understands the application he is calculating.

Check whether fluid variables such as velocity and pressure are smoothly distributed over the body and vary rapidly only where expected. Discontinuities may be the result of poor panel definition or insufficient mesh. Ø Ø Perform some simple hand calculations to check orders of magnitudes of variables. g. with reduced geometry) to get an idea for the numbers involved. The accuracy of the result can only truly be determined by knowing the answer in advance. g. round-of errors). Guidelines: Ø Ensure that the solution algorithm used is the most suitable, and recognise the approximations used.

Unstructured meshes are especially well suited for this purpose. If block structured grids are used local refinement results in block attachments with dissimilar number of grid lines. Some CFD codes provide algorithms to adapt the grid resolution locally according to numerical criteria from the flow solution, such as gradient information or error estimators. e. with decreasing cell size. However, due to limitations imposed by the increased computer storage and runtime some compromise is nearly always inevitable.

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