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Virginia Tech

1. Jones, Matthew Cecil. Accelerating Conceptual Design Analysis of Marine Vehicles through Deep Learning.

Degree: PhD, Aerospace and Ocean Engineering, 2019, Virginia Tech

Evaluation of the flow field imparted by a marine vehicle reveals the underlying efficiency and performance. However, the relationship between precise design features and their impact on the flow field is not well characterized. The goal of this work is first, to investigate the thermally-stratified near field of a self-propelled marine vehicle to identify the significance of propulsion and hull-form design decisions, and second, to develop a functional mapping between an arbitrary vehicle design and its associated flow field to accelerate the design analysis process. The unsteady Reynolds-Averaged Navier-Stokes equations are solved to compute near-field wake profiles, showing good agreement to experimental data and providing a balance between simulation fidelity and numerical cost, given the database of cases considered. Machine learning through convolutional networks is employed to discover the relationship between vehicle geometries and their associated flow fields with two distinct deep-learning networks. The first network directly maps explicitly-specified geometric design parameters to their corresponding flow fields. The second network considers the vehicle geometries themselves as tensors of geometric volume fractions to implicitly-learn the underlying parameter space. Once trained, both networks effectively generate realistic flow fields, accelerating the design analysis from a process that takes days to one that takes a fraction of a second. The implicit-parameter network successfully learns the underlying parameter space for geometries within the scope of the training data, showing comparable performance to the explicit-parameter network. With additions to the size and variability of the training database, this network has the potential to abstractly generalize the design space for arbitrary geometric inputs, even those beyond the scope of the training data. Advisors/Committee Members: Paterson, Eric G. (committeechair), Devenport, William J. (committee member), Pitt, Jonathan (committee member), Roy, Christopher John (committee member).

Subjects/Keywords: near wake; machine learning; deep learning; adversarial network; OpenFOAM

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Jones, M. C. (2019). Accelerating Conceptual Design Analysis of Marine Vehicles through Deep Learning. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/89341

Chicago Manual of Style (16th Edition):

Jones, Matthew Cecil. “Accelerating Conceptual Design Analysis of Marine Vehicles through Deep Learning.” 2019. Doctoral Dissertation, Virginia Tech. Accessed May 25, 2019. http://hdl.handle.net/10919/89341.

MLA Handbook (7th Edition):

Jones, Matthew Cecil. “Accelerating Conceptual Design Analysis of Marine Vehicles through Deep Learning.” 2019. Web. 25 May 2019.

Vancouver:

Jones MC. Accelerating Conceptual Design Analysis of Marine Vehicles through Deep Learning. [Internet] [Doctoral dissertation]. Virginia Tech; 2019. [cited 2019 May 25]. Available from: http://hdl.handle.net/10919/89341.

Council of Science Editors:

Jones MC. Accelerating Conceptual Design Analysis of Marine Vehicles through Deep Learning. [Doctoral Dissertation]. Virginia Tech; 2019. Available from: http://hdl.handle.net/10919/89341

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