A new adjustment-free damping method for free-surface waves in numerical simulations
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Inclou dades d'ús des de 2022
Cita com:
hdl:2117/331055
Tipus de documentText en actes de congrés
Data publicació2017
EditorCIMNE
Condicions d'accésAccés obert
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Abstract
Simulating free-surface flow around ships in sea waves using RANSE-Methods
usually requires damping of the waves in front of the outlet to avoid reflections. It has been
shown, that common damping methods like sponge layer methods deliver a reliable damping for
monochromatic waves, but require a parameter adjustment by the user for different wave scales.
The paper describes a new wave damping method which delivers results of same accuracy (reflections
less than 2%) but does not require a manual user adjustment. The method is based on damping the
vertical velocity component to reduce wave propagation. This is done by implicitly
relaxing this component to zero. The relaxation is implemented with the deferred
correction approach. The method is implemented in our own in-house OpenFOAM solver,
which is a RANSE code using the volume of fluid method and a SIMPLE-like algorithm
for the solution. Verification is done in 2D for waves of different scales, steepness,
computational meshes and damping zone measures. A comparison to a linear sponge layer approach is
given for the different wave scales. The 2D simulations show, that the best wave damping is
achieved with the same relaxation function parameters for each individual wave. A 3D application
to a modern yacht in head waves is presented. All simulation results show that the new method
delivers a reliable wave damping without any parameter adjustment. The method is particularly
applicable for flows with waves of different scales, like sea waves superposed with the wave system
generated by a yacht.
CitacióMeyer, J.; Graf, K.; Slawig, T. A new adjustment-free damping method for free-surface waves in numerical simulations. A: MARINE VII. "MARINE VII : proceedings of the VII International Conference on Computational Methods in Marine Engineering". CIMNE, 2017, p. 296-311. ISBN 978-84-946909-8-3.
ISBN978-84-946909-8-3
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Marine-2017-23_A new adjustement-free damping.pdf | 2,516Mb | Visualitza/Obre |