Abstract:In this article, the development of high-order semi-implicit interpolation schemes for convection terms on unstructured grids is presented. It is based on weighted essentially non-oscillatory (WENO) reconstructions which can be applied to the evaluation of any field in finite volumes using its known cell-averaged values. Here, the algorithm handles convex cells in arbitrary three-dimensional meshes. The implementation is parallelized using the Message Passing Interface. All schemes are embedded in the code structure of OpenFOAM ® resulting in the access to a huge open-source community and the applicability to high-level programming. Several verification cases and applications of the scalar advection equation and the incompressible Navier-Stokes equations show the improved accuracy of the WENO approach due to a mapping of the stencil to a reference space without scaling effects. An efficiency analysis indicates an increased computational effort of high-order schemes in comparison to available high-resolution methods. However, the reconstruction time can be efficiently decreased when more processors are used.
The main objective of the present paper is the assessment of the influence of shallow water conditions on the hydrodynamic exciters of ship hull vibration using hybrid RANS/LES methods. The following topics will be briefly discussed: • Validation of hybrid methods for calculation of ship wake in shallow water • Analysis of the influence of different factors on the nominal wake characteristics • Assessment of thrust fluctuations and pressure pulses and their sensitivity to motion conditions It will be shown, that the depth restriction may influence the periodic forces and moments acting on the ship stern and by these means intensify the vibration.
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