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Keywords = finite element methed

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12 pages, 2839 KB  
Article
Multiscale Multiphysics Modeling of the Infiltration Process in the Permafrost
by Sergei Stepanov, Djulustan Nikiforov and Aleksandr Grigorev
Mathematics 2021, 9(20), 2545; https://doi.org/10.3390/math9202545 - 11 Oct 2021
Cited by 11 | Viewed by 2497
Abstract
In this work, we design a multiscale simulation method based on the Generalized Multiscale Finite Element Method (GMsFEM) for numerical modeling of fluid seepage under permafrost condition in heterogeneous soils. The complex multiphysical model consists of the coupled Richards equation and the Stefan [...] Read more.
In this work, we design a multiscale simulation method based on the Generalized Multiscale Finite Element Method (GMsFEM) for numerical modeling of fluid seepage under permafrost condition in heterogeneous soils. The complex multiphysical model consists of the coupled Richards equation and the Stefan problem. These problems often contain heterogeneities due to variations of soil properties. For this reason, we design coarse-grid spaces for the multiphysical problem and design special algorithms for solving the overall problem. A numerical method has been tested on two- and three-dimensional model problems. A a quasi-real geometry with a complex surface is considered for the three-dimensional case. We demonstrate the efficiency and accuracy of the proposed method using several representative numerical results. Full article
(This article belongs to the Collection Multiscale Computation and Machine Learning)
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23 pages, 28085 KB  
Article
Pressure Hull Design Methods for Unmanned Underwater Vehicles
by Alessia Meschini, Alessandro Ridolfi, Jonathan Gelli, Marco Pagliai and Andrea Rindi
J. Mar. Sci. Eng. 2019, 7(11), 382; https://doi.org/10.3390/jmse7110382 - 28 Oct 2019
Cited by 18 | Viewed by 14129
Abstract
This paper describes design methods for the plastic hull of an Unmanned Underwater Vehicle (UUV), with a particular focus on its cylindrical body and nearly spherical domes at the ends. With the proposed approach, the methodologies reported in the literature were compared, and [...] Read more.
This paper describes design methods for the plastic hull of an Unmanned Underwater Vehicle (UUV), with a particular focus on its cylindrical body and nearly spherical domes at the ends. With the proposed approach, the methodologies reported in the literature were compared, and suitable modifications and improvements were investigated and implemented to extend the classical theories and data to this case study. The investigated underwater vehicle, named FeelHippo, was designed and assembled by the Department of Industrial Engineering of the University of Florence. Its main hull is composed of an extruded PMMA (PolyMethyl MethAcrylate) cylinder and two thermoformed PMMA domes. Breakage of the hull results in destructive phenomena, namely, yielding and buckling. An experimental campaign and FEM (Finite Element Method) analysis were carried out to complete the theoretical study, and the collapse pressures were compared with the derived design values. In conclusion, the proposed innovative method is a lean and effective technique for designing underwater hull domes and predicting the collapse pressures. Full article
(This article belongs to the Section Ocean Engineering)
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