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 on the hull wave resistance. Such problem is relevant at the preliminary stages of the ship design, when several flow simulations are 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 AS, and shared subspace. Response surface method is used to minimize the total drag.

Model order reduction by means of active subspaces and dynamic mode decomposition for parametric hull shape design hydrodynamics / Tezzele, Marco; Demo, Nicola; Gadalla, Mahmoud Gamal Ali Salem; Mola, Andrea; Rozza, Gianluigi. - (2018), pp. 569-576. ((Intervento presentato al convegno 19th International Conference on Ship and Maritime Research [10.3233/978-1-61499-870-9-569].

Model order reduction by means of active subspaces and dynamic mode decomposition for parametric hull shape design hydrodynamics

Tezzele, Marco;Demo, Nicola;GADALLA, Mahmoud Gamal Ali Salem;Mola, Andrea;Rozza, Gianluigi
2018

Abstract

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 on the hull wave resistance. Such problem is relevant at the preliminary stages of the ship design, when several flow simulations are 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 AS, and shared subspace. Response surface method is used to minimize the total drag.
Technology and Science for the Ships of the Future: Proceedings of NAV 2018: 19th International Conference on Ship & Maritime Research
569
576
978-1-61499-869-3
978-1-61499-870-9
https://arxiv.org/abs/1803.07377
IOS Press
Tezzele, Marco; Demo, Nicola; Gadalla, Mahmoud Gamal Ali Salem; Mola, Andrea; Rozza, Gianluigi
File in questo prodotto:
File Dimensione Formato  
1803.07377v2.pdf

accesso aperto

Tipologia: Documento in Pre-print
Licenza: Non specificato
Dimensione 743.75 kB
Formato Adobe PDF
743.75 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11767/83976
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 14
  • ???jsp.display-item.citation.isi??? 8
social impact