Geophysical Flows—Fluid-Structure Interaction and Transport Phenomena

A special issue of Geosciences (ISSN 2076-3263). This special issue belongs to the section "Hydrogeology".

Deadline for manuscript submissions: closed (30 November 2020) | Viewed by 3827

Special Issue Editors


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Guest Editor
University of Notre Dame, Notre Dame, IN 46556, USA
Interests: environmental flows; fluvial and aeolian processes; porous media; multi-phase flows complex topographies; fluid-structure interaction; geomorphology

E-Mail Website
Guest Editor
University of Notre Dame, Notre Dame, IN 46556, USA
Interests: experimental fluid dynamics; turbulence; aeolian geomorphology; fluvial geomorphology; sediment transport

Special Issue Information

Dear Colleagues,

Geophysical flows are key drivers of environmental evolution. Occurring across an expansive range of spatial scales, they are crucially important to both science and engineering. Environmental flows transport the chemical elements that are central to all ecosystems, thus directly controlling life sustainability (hydrology, ecology). Through complex fluid-structure interaction mechanisms, they interface with infrastructure, potentially threatening their integrity (civil engineering). They sculpt planetary surfaces into dynamically changing topographies by bolstering erosion and sustaining sediment mobilization (geomorphology). The energy carried by geophysical flows, while at times accompanied by catastrophic events (volcanic explosions, floods, avalanches, tsunamis), constitutes a largely available critical resource, potentially capable of meeting the demands of modern societal activities (renewable energy). However, despite their paramount societal importance, our current understanding of the physics underlying these flows and of the processes associated with them remains limited, in part due to their multi-dimensional, multi-phase and/or time-dependent nature which hinders their investigation.

The goal of this Special Issue of Geosciences is to harvest research from disparate groups, leveraging traditional and newly available approaches, including multi-disciplinary efforts, to study geophysical flows using theoretical and experimental (field, laboratory, numerical) investigations.

This special issue aims to cover, without being limited to, the following areas:

  • river, aeolian, atmospheric and ocean flows processes;
  • flow through porous media (including canopies and urban environments);
  • laminar and turbulent environmental flows;
  • fluid-structure interaction with topography (e.g. bedforms, mountains, buildings);
  • eco-hydraulics (e.g. hyporheic fluxes, contaminant transport);
  • sediment transport and morphodynamics;

Dr. Gianluca Blois
Dr. Nathaniel Bristow
Guest Editors

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Published Papers (1 paper)

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Research

31 pages, 5754 KiB  
Article
Non-Associated Flow Rule-Based Elasto-Viscoplastic Model for Clay
by Mohammad Islam and Carthigesu Gnanendran
Geosciences 2020, 10(6), 227; https://doi.org/10.3390/geosciences10060227 - 10 Jun 2020
Cited by 5 | Viewed by 3389
Abstract
We develop a non-associated flow rule (NAFR)-based elasto-viscoplastic (EVP) model for isotropic clays. For the model formulation, we introduce the critical state soil mechanics theory (CSSMT), the bounding surface theory and Perzyna’s overstress theory. The NAFR based EVP model comprises three surfaces: the [...] Read more.
We develop a non-associated flow rule (NAFR)-based elasto-viscoplastic (EVP) model for isotropic clays. For the model formulation, we introduce the critical state soil mechanics theory (CSSMT), the bounding surface theory and Perzyna’s overstress theory. The NAFR based EVP model comprises three surfaces: the potential surface, the reference surface and the loading surface. Additionally, in the model formulation, assuming the potential surface and the reference surface are identical, we obtain the associated flow rule-based EVP model. Both EVP models require seven parameters and five of them are identical to the Modified Cam Clay model. The other two parameters are the surface shape parameter and the secondary compression index. Moreover, we introduce the shape parameter in the model formulation to control the surface shape and to account for the overconsolidation state of clay. Additionally, we incorporate the secondary compression index to introduce the viscosity of clay. Also, we validate the EVP model performances for the Shanghai clay, the San Francisco Bay Mud (SFBM) clay and the Kaolin clay. Furthermore, we use the EVP models to predict the long-term field monitoring measurement of the Nerang Broadbeach roadway embankment in Australia. From the comparison of model predictions, we find that the non-associated flow rule EVP model captures well a wide range of experimental results and field monitoring embankment data. Furthermore, we also observe that the natural clay exhibits the flow rule effect more compared to the reconstituted clay. Full article
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