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Item type:Publication, Access status: with files , Advanced methods for partitioned fluid-structure interaction simulations applied to ship propellers(American Society of Mechanical Engineers (ASME), 2022-06); ; ; ; In naval architecture, fluid-structure interaction (FSI) is highly important for many applications. The accurate and fast computation of FSI problems is for this reason a major challenge for a simulation engineer working on flexible structures interacting with water and wind. For ship propellers, steel and metal alloy have long been the dominating choice of material. With the advancement in the development of fiber-reinforced polymers such as carbon fiber reinforced polymers the consideration of FSI for ship propellers becomes increasingly important. This work presents a partitioned coupled solution approach for the simulation of FSI problems on the example of a large ship propeller. The in-house developed software library comana is used as coupling manager together with the commercial finite element method solver ANSYS as structural solver and the boundary element method solver panMARE as fluid solver. comana offers the possibility to couple a number of existing and highly specialized solvers to solve multifield problems. For partitioned coupled FSI problems the increased computational effort due to the necessary coupling iterations and possible instabilities due to the partitioned coupling should be reduced by suitable predictor and convergence acceleration methods. For convergence acceleration, the Aitken method is one of the most common choices even though Quasi-Newton methods such as the Quasi-Newton least-squares method show promising results for the acceleration of FSI simulations. The interpolation technique which is necessary to map the coupling quantities between the subfields for a nonmatching discretization on the interface between the subproblems is also important for a stable, accurate, and fast solution. The simulation of a ship propeller is introduced and the advantages and disadvantages of the partitioned FSI simulation approach are shown. Predictor and convergence acceleration schemes to improve the solution process are discussed and results for flexible ship propellers are presented.Publicationtype: Conference Paper172 415 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Validation of a partitioned fluid-structure interaction simulation for turbo machine rotors(Taylor & Francis, 2022-05-14); ; ; ; A partitioned solution approach for the fluid-structure interaction (FSI) simulations of turbo machine rotors is presented. The in-house developed boundary element method solver panMARE is used for the fluid simulation, while the structural side is treated with the commercial finite element method solver ANSYS. The generic in-house multiphysics coupling library comana is used for the management of the implicit coupling procedure. As the first example, the KRISO container ship propeller is considered. The simulation is validated for open water test conditions assuming a rigid propeller based on the thrust and torque coefficients. Simulation results for a flexible propeller in open water are also presented. In the second example, the validation of the FSI simulation is conducted for a multilayered flexible submersible mixer based on thrust and torque coefficients and local strains. The results show a good agreement between the simulations and the experimental data for both examples.Publicationtype: Journal Article135 464 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , A partitioned solution approach for the simulation of the dynamic behaviour of flexible marine propellers(2020-01-02); ; ; Modern designs of ship-propellers make use of novel materials such as composites, which may show a much lower stiffness than classical material. In order to accurately predict the hydrodynamic characteristics of these propellers in real operating conditions, the structural deformation must be accounted for, which leads to a fluid-structure interaction problem. In the present paper, a partitioned solution approach for such a strongly coupled two-field problem is presented. Owing to the separate modelling of the fluid and the structural problem in such approaches, specialised numerical methods can be applied on either side. Thanks to their superior convergence properties, we use high-order finite elements to discretise the structural problem. On the fluid side, a boundary element method, which is specifically designed to simulate the hydrodynamic behaviour of ship propellers is employed. In order to stabilise the solution procedure, different coupling algorithms and convergence acceleration methods are investigated.Publicationtype: Journal Article74