The sensitivity of ship resistance to wall-adjacent grids and near-wall treatments

Numerical simulations of turbulent flows around KCS have been performed to study the sensitivity of ship resistance to wall-adjacent grids and disclose the influence of near-wall treatment on the sensitivity of ship resistance. The resistance coefficients of viscous and pressure forces were compared...

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Main Authors:	Dong Woo Park, Sang Bong Lee
Format:	Article
Language:	English
Published:	Elsevier 2018-11-01
Series:	International Journal of Naval Architecture and Ocean Engineering
Online Access:	http://www.sciencedirect.com/science/article/pii/S2092678217302327

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spelling	doaj-81ccd3e110d24a6b8ec5575bf09e89e12020-11-25T00:59:33ZengElsevierInternational Journal of Naval Architecture and Ocean Engineering2092-67822018-11-01106683691The sensitivity of ship resistance to wall-adjacent grids and near-wall treatmentsDong Woo Park0Sang Bong Lee1Department of Naval Architecture and Ocean Engineering, TongMyong University, Busan, South KoreaDepartment of Naval Architecture and Offshore Engineering, Dong-A University, Busan, South Korea; Corresponding author.Numerical simulations of turbulent flows around KCS have been performed to study the sensitivity of ship resistance to wall-adjacent grids and disclose the influence of near-wall treatment on the sensitivity of ship resistance. The resistance coefficients of viscous and pressure forces were compared when using realizable k-ε and SST k-ω turbulence models in structured and unstructured grids, respectively. The calculation of friction velocity was found to be mainly responsible for the reduction of viscous and total resistances when the height of wall-adjacent cells increased. Since the assumption of equilibrium state between turbulent production and dissipation was not met in a bulbous bow, it was more reasonable to iteratively calculate the friction velocity from empirical laws of the wall for near-wall treatment rather than explicitly estimate it from the turbulent kinetic energy.http://www.sciencedirect.com/science/article/pii/S2092678217302327
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Dong Woo Park Sang Bong Lee
spellingShingle	Dong Woo Park Sang Bong Lee The sensitivity of ship resistance to wall-adjacent grids and near-wall treatments International Journal of Naval Architecture and Ocean Engineering
author_facet	Dong Woo Park Sang Bong Lee
author_sort	Dong Woo Park
title	The sensitivity of ship resistance to wall-adjacent grids and near-wall treatments
title_short	The sensitivity of ship resistance to wall-adjacent grids and near-wall treatments
title_full	The sensitivity of ship resistance to wall-adjacent grids and near-wall treatments
title_fullStr	The sensitivity of ship resistance to wall-adjacent grids and near-wall treatments
title_full_unstemmed	The sensitivity of ship resistance to wall-adjacent grids and near-wall treatments
title_sort	sensitivity of ship resistance to wall-adjacent grids and near-wall treatments
publisher	Elsevier
series	International Journal of Naval Architecture and Ocean Engineering
issn	2092-6782
publishDate	2018-11-01
description	Numerical simulations of turbulent flows around KCS have been performed to study the sensitivity of ship resistance to wall-adjacent grids and disclose the influence of near-wall treatment on the sensitivity of ship resistance. The resistance coefficients of viscous and pressure forces were compared when using realizable k-ε and SST k-ω turbulence models in structured and unstructured grids, respectively. The calculation of friction velocity was found to be mainly responsible for the reduction of viscous and total resistances when the height of wall-adjacent cells increased. Since the assumption of equilibrium state between turbulent production and dissipation was not met in a bulbous bow, it was more reasonable to iteratively calculate the friction velocity from empirical laws of the wall for near-wall treatment rather than explicitly estimate it from the turbulent kinetic energy.
url	http://www.sciencedirect.com/science/article/pii/S2092678217302327
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The sensitivity of ship resistance to wall-adjacent grids and near-wall treatments

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