Development of Efficient and Accurate Parallel Computation Algorithm Using Moving Overset Grids on Background Multi-Domains for Complex Two-Phase Flows

The goal of this study involves developing an efficient and accurate parallel computation method for two-phase flow problems including complex moving foreign bodies. The proposed parallel computing techniques are based on the moving body-fitted grids’ overset on background multidomains wit...

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Main Authors: Minho Ha, Cheolung Cheong, Hanshin Seol, Bu-Geun Paik, Min-Jae Kim, Young-Rae Jung
Format: Article
Language:English
Published: MDPI AG 2018-10-01
Series:Applied Sciences
Subjects:
Online Access:http://www.mdpi.com/2076-3417/8/10/1937
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author Minho Ha
Cheolung Cheong
Hanshin Seol
Bu-Geun Paik
Min-Jae Kim
Young-Rae Jung
author_facet Minho Ha
Cheolung Cheong
Hanshin Seol
Bu-Geun Paik
Min-Jae Kim
Young-Rae Jung
author_sort Minho Ha
collection DOAJ
description The goal of this study involves developing an efficient and accurate parallel computation method for two-phase flow problems including complex moving foreign bodies. The proposed parallel computing techniques are based on the moving body-fitted grids’ overset on background multidomains with grid-overlapping at their interface. First, the cavitation flow over the hemispherical head form is investigated using the two-phase flow solver, which is validated by comparing the numerical and experimental results. Subsequently, the parallel computing technique based on the multidomain method that divides the computational domain into several smaller subdomains is proposed to facilitate more efficient numerical simulations. At the interface of the subdomains, the grid-overlapping method is proposed for more accurate simulations. The illustrative computations indicate that the accuracy of the parallel computation combined with the grid-overlapping method on multidomains is identical to that of the serial computation based on a single block, albeit with a significant reduction in the computation time. Finally, the moving overset grid technique is combined with the background multidomain method and applied to simulate the gust flow that is generated by the pitching motions of the twin hydrofoils. The overset grid technique includes the following three sequential steps: hole-cutting, finding donor cells, and bilinear interpolation. The prediction results for the inflow gust generated by oscillating hydrofoils closely follow the measured results.
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spelling doaj.art-21b299728fc74e73b32a4214eaa680532022-12-21T19:19:43ZengMDPI AGApplied Sciences2076-34172018-10-01810193710.3390/app8101937app8101937Development of Efficient and Accurate Parallel Computation Algorithm Using Moving Overset Grids on Background Multi-Domains for Complex Two-Phase FlowsMinho Ha0Cheolung Cheong1Hanshin Seol2Bu-Geun Paik3Min-Jae Kim4Young-Rae Jung5School of Mechanical Engineering, Pusan National University, Busan 46241, KoreaSchool of Mechanical Engineering, Pusan National University, Busan 46241, KoreaKorea Research Institute of Ships & Ocean Engineering, Daejeon 34103, KoreaKorea Research Institute of Ships & Ocean Engineering, Daejeon 34103, KoreaAgency for Defense Development, Changwon 51698, KoreaAgency for Defense Development, Changwon 51698, KoreaThe goal of this study involves developing an efficient and accurate parallel computation method for two-phase flow problems including complex moving foreign bodies. The proposed parallel computing techniques are based on the moving body-fitted grids’ overset on background multidomains with grid-overlapping at their interface. First, the cavitation flow over the hemispherical head form is investigated using the two-phase flow solver, which is validated by comparing the numerical and experimental results. Subsequently, the parallel computing technique based on the multidomain method that divides the computational domain into several smaller subdomains is proposed to facilitate more efficient numerical simulations. At the interface of the subdomains, the grid-overlapping method is proposed for more accurate simulations. The illustrative computations indicate that the accuracy of the parallel computation combined with the grid-overlapping method on multidomains is identical to that of the serial computation based on a single block, albeit with a significant reduction in the computation time. Finally, the moving overset grid technique is combined with the background multidomain method and applied to simulate the gust flow that is generated by the pitching motions of the twin hydrofoils. The overset grid technique includes the following three sequential steps: hole-cutting, finding donor cells, and bilinear interpolation. The prediction results for the inflow gust generated by oscillating hydrofoils closely follow the measured results.http://www.mdpi.com/2076-3417/8/10/1937cavitation flowmoving overset gridgrid-overlapping interfaceparallel computing
spellingShingle Minho Ha
Cheolung Cheong
Hanshin Seol
Bu-Geun Paik
Min-Jae Kim
Young-Rae Jung
Development of Efficient and Accurate Parallel Computation Algorithm Using Moving Overset Grids on Background Multi-Domains for Complex Two-Phase Flows
Applied Sciences
cavitation flow
moving overset grid
grid-overlapping interface
parallel computing
title Development of Efficient and Accurate Parallel Computation Algorithm Using Moving Overset Grids on Background Multi-Domains for Complex Two-Phase Flows
title_full Development of Efficient and Accurate Parallel Computation Algorithm Using Moving Overset Grids on Background Multi-Domains for Complex Two-Phase Flows
title_fullStr Development of Efficient and Accurate Parallel Computation Algorithm Using Moving Overset Grids on Background Multi-Domains for Complex Two-Phase Flows
title_full_unstemmed Development of Efficient and Accurate Parallel Computation Algorithm Using Moving Overset Grids on Background Multi-Domains for Complex Two-Phase Flows
title_short Development of Efficient and Accurate Parallel Computation Algorithm Using Moving Overset Grids on Background Multi-Domains for Complex Two-Phase Flows
title_sort development of efficient and accurate parallel computation algorithm using moving overset grids on background multi domains for complex two phase flows
topic cavitation flow
moving overset grid
grid-overlapping interface
parallel computing
url http://www.mdpi.com/2076-3417/8/10/1937
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