Extension of a fast method for 2d steady free surface flow to stretched surface grids
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Estadístiques de LA Referencia / Recolecta
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/329643
Tipus de documentText en actes de congrés
Data publicació2019
EditorCIMNE
Condicions d'accésAccés obert
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Abstract
Steady free surface flow is often encountered in marine engineering, e.g. for
calculating ship hull resistance. When these flows are solved with CFD, the water-air interface can
be represented using a surface fitting approach. The resulting free boundary problem requires an
iterative technique to solve the flow and at the same time determine the free surface position. Most
such methods use a time-stepping scheme, which is inefficient for solving steady flows.
There is one steady technique which uses a special boundary condition at the free
surface, but that method needs a dedicated coupled flow solver. To overcome these
disadvantages an efficient free surface method was developed recently, in which the flow solver can
be a black-box. It is based on quasi-Newton iterations which use a surrogate model in
combination with flow solver inputs and outputs from previous iterations to approximate the
Jacobian. As the original method was limited to uniform free surface grids, it is extended in this
paper to stretched free surface grids. For this purpose, a different surrogate model is
constructed by transforming a relation between perturbations of the free surface height
and pressure from the wavenumber domain to the spatial domain using the convolution theorem.
The method is tested on the 2D flow over an object. The quasi-Newton iterations converge
exponentially and in a low number of iterations.
CitacióDemeester, T.; Van Brummelen, E.H.; Degroote, J. Extension of a fast method for 2d steady free surface flow to stretched surface grids. A: MARINE VIII. "MARINE VIII : proceedings of the VIII International Conference on Computational Methods in Marine Engineering". CIMNE, 2019, p. 235-246. ISBN 978-84-949194-3-5.
ISBN978-84-949194-3-5
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