東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Parallel processing of Eulerian-Lagr...

Kuan, Chih-Kuang.

Linked to FindBook

Google Book

Amazon

博客來

Parallel processing of Eulerian-Lagrangian, cell-based adaptive method for moving boundary problems.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Parallel processing of Eulerian-Lagrangian, cell-based adaptive method for moving boundary problems./
Author:	Kuan, Chih-Kuang.
Description:	175 p.
Notes:	Source: Dissertation Abstracts International, Volume: 75-01(E), Section: B.
Contained By:	Dissertation Abstracts International75-01B(E).
Subject:	Engineering, Aerospace. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3595321
ISBN:	9781303405839

Parallel processing of Eulerian-Lagrangian, cell-based adaptive method for moving boundary problems.
Kuan, Chih-Kuang.

Parallel processing of Eulerian-Lagrangian, cell-based adaptive method for moving boundary problems. - 175 p.

Source: Dissertation Abstracts International, Volume: 75-01(E), Section: B.

Thesis (Ph.D.)--University of Michigan, 2013.

In this study, issues and techniques related to the parallel processing of the Eulerian-Lagrangian method for multi-scale moving boundary computation are investigated. The scope of the study consists of the Eulerian approach for field equations, explicit interface-tracking, Lagrangian interface modification and reconstruction algorithms, and a cell-based unstructured adaptive mesh refinement (AMR) in a distributed-memory computation framework. We decomposed the Eulerian domain spatially along with AMR to balance the computational load of solving field equations, which is a primary cost of the entire solver. The Lagrangian domain is partitioned based on marker vicinities with respect to the Eulerian partitions to minimize inter-processor communication. Overall, the performance of an Eulerian task peaks at 10,000-20,000 cells per processor, and it is the upper bound of the performance of the Eulerian- Lagrangian method. Moreover, the load imbalance of the Lagrangian task is not as influential as the communication overhead of the Eulerian-Lagrangian tasks on the overall performance. To assess the parallel processing capabilities, a high Weber number drop collision is simulated. The high convective to viscous length scale ratios result in disparate length scale distributions; together with the moving and topologically irregular interfaces, the computational tasks require temporally and spatially resolved treatment adaptively. The techniques presented enable us to perform original studies to meet such computational requirements. Coalescence, stretch, and break-up of satellite droplets due to the interfacial instability are observed in current study, and the history of interface evolution is in good agreement with the experimental data. The competing mechanisms of the primary and secondary droplet break up, along with the gas-liquid interfacial dynamics are systematically investigated. This study shows that Rayleigh-Taylor instability on the edge of an extruding sheet can be profound at the initial stage of collision, and Rayleigh-Plateau instability dominates the longitudinal disturbance on the fringe of the liquid sheet at a long time, which eventually results in primary breakups.

ISBN: 9781303405839Subjects--Topical Terms:

1018395
Engineering, Aerospace.

Parallel processing of Eulerian-Lagrangian, cell-based adaptive method for moving boundary problems.
LDR:03163nam a2200289 4500 001 1958775
005 20140426114422.5
008 150210s2013 ||||||||||||||||| ||eng d
020 $a 9781303405839
035 $a (MiAaPQ)AAI3595321
035 $a AAI3595321
040 $a MiAaPQ $c MiAaPQ
100 1 $a Kuan, Chih-Kuang. $3 2093966
245 1 0 $a Parallel processing of Eulerian-Lagrangian, cell-based adaptive method for moving boundary problems.
300 $a 175 p.
500 $a Source: Dissertation Abstracts International, Volume: 75-01(E), Section: B.
500 $a Advisers: Wei Shyy; Ken Powell.
502 $a Thesis (Ph.D.)--University of Michigan, 2013.
520 $a In this study, issues and techniques related to the parallel processing of the Eulerian-Lagrangian method for multi-scale moving boundary computation are investigated. The scope of the study consists of the Eulerian approach for field equations, explicit interface-tracking, Lagrangian interface modification and reconstruction algorithms, and a cell-based unstructured adaptive mesh refinement (AMR) in a distributed-memory computation framework. We decomposed the Eulerian domain spatially along with AMR to balance the computational load of solving field equations, which is a primary cost of the entire solver. The Lagrangian domain is partitioned based on marker vicinities with respect to the Eulerian partitions to minimize inter-processor communication. Overall, the performance of an Eulerian task peaks at 10,000-20,000 cells per processor, and it is the upper bound of the performance of the Eulerian- Lagrangian method. Moreover, the load imbalance of the Lagrangian task is not as influential as the communication overhead of the Eulerian-Lagrangian tasks on the overall performance. To assess the parallel processing capabilities, a high Weber number drop collision is simulated. The high convective to viscous length scale ratios result in disparate length scale distributions; together with the moving and topologically irregular interfaces, the computational tasks require temporally and spatially resolved treatment adaptively. The techniques presented enable us to perform original studies to meet such computational requirements. Coalescence, stretch, and break-up of satellite droplets due to the interfacial instability are observed in current study, and the history of interface evolution is in good agreement with the experimental data. The competing mechanisms of the primary and secondary droplet break up, along with the gas-liquid interfacial dynamics are systematically investigated. This study shows that Rayleigh-Taylor instability on the edge of an extruding sheet can be profound at the initial stage of collision, and Rayleigh-Plateau instability dominates the longitudinal disturbance on the fringe of the liquid sheet at a long time, which eventually results in primary breakups.
590 $a School code: 0127.
650 4 $a Engineering, Aerospace. $3 1018395
650 4 $a Computer Science. $3 626642
650 4 $a Applied Mathematics. $3 1669109
690 $a 0538
690 $a 0984
690 $a 0364
710 2 $a University of Michigan. $b Aerospace Engineering. $3 2093897
773 0 $t Dissertation Abstracts International $g 75-01B(E).
790 $a 0127
791 $a Ph.D.
792 $a 2013
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3595321