Print Email Facebook Twitter Implementation of wave effects in the unstructured Delft3D suite Title Implementation of wave effects in the unstructured Delft3D suite Author Stengs, B. Contributor Stive, M.J.F. (mentor) Luijendijk, A.P. (mentor) Zijlema, M. (mentor) Roelvink, J.A. (mentor) Stelling, G.S. (mentor) Faculty Civil Engineering and Geosciences Department Hydraulic Engineering Date 2013-05-28 Abstract Recently an unstructured version of Delft3D, named D-Flow FM, has been developed at Deltares. This tool shows high potentials for coastal modelling due to the flexibility in domain resolution and unstructured grids. This MSc thesis focussed on implementing wave effects in D-Flow FM with satisfying results. In addition, a coupling system is built, enabling a flexible coupling between D-Flow FM and the wave module SWAN, for modelling the wave-current interaction. An innovative program-structure is presented which provides a dynamic coupling tool enabling interactive modelling. This coupled tool shows large opportunities for coastal models where flexible resolution and geometry fitting are desired. Applications like the Sand Engine or the Wadden Sea modelling tidal velocity patterns at offshore regions and meandering gullies and rip channels at nearshore regions, all in one domain. These kinds of models are usually very computationally intensive, especially when morphodynamics are also included. With the introduction of unstructured modelling, coastal applications like the Sand Engine or the Wadden Sea, are modelled more efficiently. The wave formulations implemented in D-Flow FM are state-of-the-art and correspond to the implementation as in Delft3D, which have been tested and validated with success. In the validation of wave modelling by D-Flow FM, four different test cases are considered. First, a simplified open channel flow is analysed, where the general performance of D-Flow FM is verified to the analytical solution. Second, an M2-tide for an alongshore uniform beach is modelled. Next, oblique incident waves are modelled on a planar beach. And finally, a non-uniform barred beach is modelled (Egmond case) with rip channels induced by waves. By means of these test cases the wave formulations in D-Flow FM are validated. From the test cases, it is concluded that modelling waves in D-Flow FM generally gives good agreement with validated Delft3D models. The velocity patterns, both in magnitude and direction, show a good match, as confirmed by the Egmond case. The water levels modelled by the planar beach case match the Delft3D simulation as well. However, despite a good performance inside the surf zone, small model deviations are found outside the surf zone, at intermediate water depths. These model deviations should be reduced by correcting the bed shear stress for Stokes drift. Past studies have proven the benefits of unstructured modelling over structured techniques, which shows high potential for D-Flow FM. With the inclusion of wave effects in D-Flow FM, improvement to nearshore modelling is made, but an extensive validation needs to be done. The dynamic software coupler provides an interactive modelling experience, and serves as a comprehensive tool for general model understanding. These developments have contributed significantly to improve nearshore modelling by D-Flow FM. Subject Delft3DD-Flow FMSWANunstructured gridflexible meshnumerical wave modelling To reference this document use: http://resolver.tudelft.nl/uuid:cbe8a60c-3b67-4048-beb6-b5e79a5b3d26 Part of collection Student theses Document type master thesis Rights (c) 2013 Stengs, B. Files PDF 280513_Implementation_of_ ... _Final.pdf 2.81 MB Close viewer /islandora/object/uuid:cbe8a60c-3b67-4048-beb6-b5e79a5b3d26/datastream/OBJ/view