Analysis of Convergence Behavior for the Overset Mesh Based Numerical Wave Tank in openfoamSource: Journal of Offshore Mechanics and Arctic Engineering:;2023:;volume( 146 ):;issue: 003::page 31901-1DOI: 10.1115/1.4063265Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper presents a solution verification and validation study for an overset mesh based numerical wave tank in openfoam, which considers the coupling between a free-surface hydrodynamic flow model, a rigid body motion model, and an overset mesh. The coupling between the rigid body motion solver and the free-surface flow solver was achieved in a segregated manner. Free decay of roll motion of a barge was modeled using the numerical wave tank, and the damping coefficient was selected as the target quantity for solution verification. The least-square based solution verification procedure was adopted, where one of the four types of error estimators was fit to the data in the least-square sense. Both structured and unstructured mesh were tested, and their effects on the convergence order, numerical uncertainty, and error were carefully investigated. From the numerical tests, it is found that the numerical wave tank exhibits a very good convergence property for the floating body problems with structured mesh, i.e., nearly second order in space and first order in time. However, when switching the body-fitted mesh to unstructured mesh, the grid convergence is reduced to first order. Unstructured mesh does not significantly affect the convergence order in time domain, but results in a larger uncertainty due to data scattering.
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contributor author | Chen, Hao | |
contributor author | Qian, Ling | |
contributor author | Cao, Deping | |
date accessioned | 2024-04-24T22:43:48Z | |
date available | 2024-04-24T22:43:48Z | |
date copyright | 10/5/2023 12:00:00 AM | |
date issued | 2023 | |
identifier issn | 0892-7219 | |
identifier other | omae_146_3_031901.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4295770 | |
description abstract | This paper presents a solution verification and validation study for an overset mesh based numerical wave tank in openfoam, which considers the coupling between a free-surface hydrodynamic flow model, a rigid body motion model, and an overset mesh. The coupling between the rigid body motion solver and the free-surface flow solver was achieved in a segregated manner. Free decay of roll motion of a barge was modeled using the numerical wave tank, and the damping coefficient was selected as the target quantity for solution verification. The least-square based solution verification procedure was adopted, where one of the four types of error estimators was fit to the data in the least-square sense. Both structured and unstructured mesh were tested, and their effects on the convergence order, numerical uncertainty, and error were carefully investigated. From the numerical tests, it is found that the numerical wave tank exhibits a very good convergence property for the floating body problems with structured mesh, i.e., nearly second order in space and first order in time. However, when switching the body-fitted mesh to unstructured mesh, the grid convergence is reduced to first order. Unstructured mesh does not significantly affect the convergence order in time domain, but results in a larger uncertainty due to data scattering. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Analysis of Convergence Behavior for the Overset Mesh Based Numerical Wave Tank in openfoam | |
type | Journal Paper | |
journal volume | 146 | |
journal issue | 3 | |
journal title | Journal of Offshore Mechanics and Arctic Engineering | |
identifier doi | 10.1115/1.4063265 | |
journal fristpage | 31901-1 | |
journal lastpage | 31901-8 | |
page | 8 | |
tree | Journal of Offshore Mechanics and Arctic Engineering:;2023:;volume( 146 ):;issue: 003 | |
contenttype | Fulltext |