On novel simulation methods for complex flows in maritime applications
Author Bandringa, H., Verstappen, R., Wubs, F., Klaij, C.M. and Ploeg, A. v.d.
Title On novel simulation methods for complex flows in maritime applications
Conference/Journal 15th Numerical Towing Tank Symposium (NuTTS), Cortona, Italy
Month October
Year 2012

Turbulent flows in maritime applications usually contain a wide range of length and time scales, especially for high Reynolds numbers. Therefore, it is not feasible to solve such flows with direct numerical simulation. To reduce CPU-times, a model is proposed. Verstappen et al. proposed an LES model, named regularization. The LES model is based on symmetry preserving discretization, in which the discrete convection is filtered. By this construction, the LES model does not contain any artificial dissipation. This is quite important, since artificial dissipation can interfere with the subtle interplay between inertia and dissipation of the flow. A novel aspect of our research will be to implement the regularization model on unstructured grids. On these grids, we hope to get similar behavior as for structured grids. The symmetry preserving discretization and regularization model are being implemented in MARIN's in-house CFD solver ReFRESCO. Furthermore, we expect that the new discretization techniques allow LES computations on a coarser mesh/larger time step while maintaining the same accuracy, resulting in a reduced computation time.

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