20-22 June 2018
Trieste (Italy)
Europe/Rome timezone

Model order reduction by means of active subspaces and dynamic mode decomposition to parametrized hull shape into hydrodynamic design problems

21 Jun 2018, 08:45
15m
Marconi (Trieste (Italy))

Marconi

Trieste (Italy)

Stazione Marittima
Paper Naval ships design & technology Hydrodynamics

Speaker

Marco Tezzele (SISSA - mathLab)

Description

We present the results of the application of a parameter space reduction methodology based on active subspaces (AS) to the hull hydrodynamic design problem. Several parametric deformations of an initial hull shape are considered to assess the influence of the shape parameters, considered on the hull wave resistance. Such problem is extremely relevant at the preliminary stages of the ship design, when several flow simulations are typically carried out by the engineers to establish a certain sensibility with respect to the parameters, which might result in a high number of time consuming hydrodynamic simulations. The main idea of this work is to employ the AS to identify possible lower dimensional structures in the parameter space. The complete pipeline involves the use of free form deformation to parametrize and deform the hull shape, the high fidelity solver based on unsteady potential flow theory, with fully nonlinear free surface treatment directly interfaced with CAD, the use of dynamic mode decomposition to reconstruct the final steady state, given only few snapshots of the simulation, and the reduction of the parameter space by means of AS. A response surface methods can then be employed to perform minimization of the hull shape.

Primary author

Marco Tezzele (SISSA - mathLab)

Co-authors

Dr Andrea Mola (SISSA - mathLab) Prof. Gianluigi Rozza (SISSA - mathLab) Mahmoud Gadalla (SISSA - mathlab) Mr Nicola Demo (SISSA)

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Paper