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Development of a Coupled 3-D DEM-LBM...

Gardner, Michael Henry.

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Development of a Coupled 3-D DEM-LBM Model for Simulation of Dynamic Rock-fluid Interaction.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Development of a Coupled 3-D DEM-LBM Model for Simulation of Dynamic Rock-fluid Interaction./
作者:	Gardner, Michael Henry.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
面頁冊數:	110 p.
附註:	Source: Dissertation Abstracts International, Volume: 80-03(E), Section: B.
Contained By:	Dissertation Abstracts International80-03B(E).
標題:	Civil engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10930618
ISBN:	9780438643604

Development of a Coupled 3-D DEM-LBM Model for Simulation of Dynamic Rock-fluid Interaction.
Gardner, Michael Henry.

Development of a Coupled 3-D DEM-LBM Model for Simulation of Dynamic Rock-fluid Interaction. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 110 p.

Source: Dissertation Abstracts International, Volume: 80-03(E), Section: B.

Thesis (Ph.D.)--University of California, Berkeley, 2018.

Scour of rock is a challenging and interesting problem that combines rock mechanics and hydraulics of turbulent flow. On a practical level, rock erosion is a critical issue facing many of the world's dams at which excessive scour of the dam foundation or spillway can compromise the stability of the dam resulting in significant remediation costs, if not direct personal property damage or even loss of life. The most current example of this problem is Oroville Dam in Northern California where massive scour damage to both the service and emergency spillways during the flood events of February 2017 led to the evacuation of more than 188,000 people living downstream of the dam.

ISBN: 9780438643604Subjects--Topical Terms:

860360
Civil engineering.

Development of a Coupled 3-D DEM-LBM Model for Simulation of Dynamic Rock-fluid Interaction.
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245 1 0 $a Development of a Coupled 3-D DEM-LBM Model for Simulation of Dynamic Rock-fluid Interaction.
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500 $a Source: Dissertation Abstracts International, Volume: 80-03(E), Section: B.
500 $a Adviser: Nicholas Sitar.
502 $a Thesis (Ph.D.)--University of California, Berkeley, 2018.
520 $a Scour of rock is a challenging and interesting problem that combines rock mechanics and hydraulics of turbulent flow. On a practical level, rock erosion is a critical issue facing many of the world's dams at which excessive scour of the dam foundation or spillway can compromise the stability of the dam resulting in significant remediation costs, if not direct personal property damage or even loss of life. The most current example of this problem is Oroville Dam in Northern California where massive scour damage to both the service and emergency spillways during the flood events of February 2017 led to the evacuation of more than 188,000 people living downstream of the dam.
520 $a This research is specifically aimed at developing the ability to numerically evaluate rock- water interaction, building upon the experimental and analytical work by George and Sitar . The focus is on producing simulation techniques capable of considering the interaction between three-dimensional polyhedral rock blocks interacting with fluid such that the complex shape of the blocks is captured in both the fluid and solid numerical models. Accounting for the rock block geometry and orientations is essential in capturing the correct kinematic response.
520 $a To this end, a three-dimensional, open-source program to generate the fractured rock mass was developed based on a linear programming approach. The application runs on Apache Spark which enables it to run locally, on a computer cluster or on the Cloud. The program automatically maintains load balance among parallel processes and can be scaled up to meet computational demands without having to make any changes to the underlying source code. This enables the program to generate real-world scale block systems containing millions of blocks in minutes.
520 $a The second stage of this research effort focused on developing a new open-source Discrete Element Method (DEM) program capable of analyzing the kinematic response of fractured rock. The contact detection computations for DEM are also based on a linear programming approach such that similar logic and data structures can be used in both the block generation and DEM code, though the DEM code is written in C++. The program was validated against analytical solutions as well as other numerical solutions and has been shown to accurately capture the kinematic response of three-dimensional polyhedral rock blocks.
520 $a The DEM formulation was then extended to perform coupled fluid-solid interaction analyses by coupling it with the weakly compressible Lattice Boltzmann Method (LBM). A new algorithm, which extends the partially saturated approach, was developed to consider three-dimensional convex polyhedra moving through the fluid domain. The algorithm uses both linear programming and simplex integration for the coupling process. The LBM code and the new fluid-solid coupling algorithm were validated against experimental data and the capabilities of the new coupled DEM-LBM implementation were explored by evaluating the performance of the program in simulating several different problems involving fluid-solid interaction. The results show that the program is able to accurately capture the interaction between polyhedral rock blocks and fluid; however, further performance improvements are necessary to simulate realistic, field scale problems. Particularly, adaptive mesh refinement and multigrid methods implemented in a parallel computing environment will be essential for capturing the highly computationally intensive and multiscale nature of rock-fluid interaction.
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