Strategies to minimise numerical ventilation in CFD simulations of high-speed planing hulls

Research output: Contribution to conferencePaper

Abstract

Numerical Ventilation is a well-known problem that occurs when the Volume of Fluid method is used to model vessels with a bow that creates a small, acute entrance angle with the freesurface, typical for planing hulls and yachts. There is a general lack of discussion focusing upon Numerical Ventilation available within the public domain, which is attributable to the fact that it only affects such a niche area. The information available s difficult to find, often fleetingly mentioned in papers with a different focus. Numerical Ventilation may be considered one of the main sources of error in numerical simulations of planing hulls and as such warrants an in-depth analysis. This paper sets out to bring together the available work, as well as performing its own investigation into the problem to develop a better understanding of Numerical Ventilation and present alternate solutions. Additionally, the success and impact of different approaches is presented in an attempt to help other researchers avoid and correct for Numerical Ventilation.

Interface smearing caused by the simulations inability to track the freesurface is identified as the main source of Numerical Ventilation. This originates from the interface between the volume mesh and the prism layer mesh. This study looks into the interface to identify strategies that minimise Numerical Ventilation, presenting a novel solution to prism layer meshing that was found to have a positive impact. Through the implementation of a modified High Resolution Interface Capture (HRIC) scheme and the correct mesh refinements, it is possible to minimise the impact of Numerical Ventilation to a level that will not affect the results of a simulation and is acceptable for engineering applications

Conference

Conference38th International Conference on Ocean, Offshore & Arctic Engineering
Abbreviated titleOMAE
CountryUnited Kingdom
CityGlasgow
Period9/06/1914/06/19
Internet address

Fingerprint

Ventilation
Computational fluid dynamics
Prisms
Yachts
Fluids
Computer simulation

Keywords

  • CFD
  • planing craft
  • numerical ventilation

Cite this

Gray-Stephens, A., Tezdogan, T., & Day, S. (2019). Strategies to minimise numerical ventilation in CFD simulations of high-speed planing hulls. 1-10. Paper presented at 38th International Conference on Ocean, Offshore & Arctic Engineering, Glasgow, United Kingdom.
Gray-Stephens, Angus ; Tezdogan, Tahsin ; Day, Sandy. / Strategies to minimise numerical ventilation in CFD simulations of high-speed planing hulls. Paper presented at 38th International Conference on Ocean, Offshore & Arctic Engineering, Glasgow, United Kingdom.10 p.
@conference{85bcb8f9765c481aad43b4e306bb319d,
title = "Strategies to minimise numerical ventilation in CFD simulations of high-speed planing hulls",
abstract = "Numerical Ventilation is a well-known problem that occurs when the Volume of Fluid method is used to model vessels with a bow that creates a small, acute entrance angle with the freesurface, typical for planing hulls and yachts. There is a general lack of discussion focusing upon Numerical Ventilation available within the public domain, which is attributable to the fact that it only affects such a niche area. The information available s difficult to find, often fleetingly mentioned in papers with a different focus. Numerical Ventilation may be considered one of the main sources of error in numerical simulations of planing hulls and as such warrants an in-depth analysis. This paper sets out to bring together the available work, as well as performing its own investigation into the problem to develop a better understanding of Numerical Ventilation and present alternate solutions. Additionally, the success and impact of different approaches is presented in an attempt to help other researchers avoid and correct for Numerical Ventilation. Interface smearing caused by the simulations inability to track the freesurface is identified as the main source of Numerical Ventilation. This originates from the interface between the volume mesh and the prism layer mesh. This study looks into the interface to identify strategies that minimise Numerical Ventilation, presenting a novel solution to prism layer meshing that was found to have a positive impact. Through the implementation of a modified High Resolution Interface Capture (HRIC) scheme and the correct mesh refinements, it is possible to minimise the impact of Numerical Ventilation to a level that will not affect the results of a simulation and is acceptable for engineering applications",
keywords = "CFD, planing craft, numerical ventilation",
author = "Angus Gray-Stephens and Tahsin Tezdogan and Sandy Day",
year = "2019",
month = "6",
day = "14",
language = "English",
pages = "1--10",
note = "38th International Conference on Ocean, Offshore & Arctic Engineering, OMAE ; Conference date: 09-06-2019 Through 14-06-2019",
url = "https://event.asme.org/OMAE",

}

Gray-Stephens, A, Tezdogan, T & Day, S 2019, 'Strategies to minimise numerical ventilation in CFD simulations of high-speed planing hulls' Paper presented at 38th International Conference on Ocean, Offshore & Arctic Engineering, Glasgow, United Kingdom, 9/06/19 - 14/06/19, pp. 1-10.

Strategies to minimise numerical ventilation in CFD simulations of high-speed planing hulls. / Gray-Stephens, Angus; Tezdogan, Tahsin; Day, Sandy.

2019. 1-10 Paper presented at 38th International Conference on Ocean, Offshore & Arctic Engineering, Glasgow, United Kingdom.

Research output: Contribution to conferencePaper

TY - CONF

T1 - Strategies to minimise numerical ventilation in CFD simulations of high-speed planing hulls

AU - Gray-Stephens, Angus

AU - Tezdogan, Tahsin

AU - Day, Sandy

PY - 2019/6/14

Y1 - 2019/6/14

N2 - Numerical Ventilation is a well-known problem that occurs when the Volume of Fluid method is used to model vessels with a bow that creates a small, acute entrance angle with the freesurface, typical for planing hulls and yachts. There is a general lack of discussion focusing upon Numerical Ventilation available within the public domain, which is attributable to the fact that it only affects such a niche area. The information available s difficult to find, often fleetingly mentioned in papers with a different focus. Numerical Ventilation may be considered one of the main sources of error in numerical simulations of planing hulls and as such warrants an in-depth analysis. This paper sets out to bring together the available work, as well as performing its own investigation into the problem to develop a better understanding of Numerical Ventilation and present alternate solutions. Additionally, the success and impact of different approaches is presented in an attempt to help other researchers avoid and correct for Numerical Ventilation. Interface smearing caused by the simulations inability to track the freesurface is identified as the main source of Numerical Ventilation. This originates from the interface between the volume mesh and the prism layer mesh. This study looks into the interface to identify strategies that minimise Numerical Ventilation, presenting a novel solution to prism layer meshing that was found to have a positive impact. Through the implementation of a modified High Resolution Interface Capture (HRIC) scheme and the correct mesh refinements, it is possible to minimise the impact of Numerical Ventilation to a level that will not affect the results of a simulation and is acceptable for engineering applications

AB - Numerical Ventilation is a well-known problem that occurs when the Volume of Fluid method is used to model vessels with a bow that creates a small, acute entrance angle with the freesurface, typical for planing hulls and yachts. There is a general lack of discussion focusing upon Numerical Ventilation available within the public domain, which is attributable to the fact that it only affects such a niche area. The information available s difficult to find, often fleetingly mentioned in papers with a different focus. Numerical Ventilation may be considered one of the main sources of error in numerical simulations of planing hulls and as such warrants an in-depth analysis. This paper sets out to bring together the available work, as well as performing its own investigation into the problem to develop a better understanding of Numerical Ventilation and present alternate solutions. Additionally, the success and impact of different approaches is presented in an attempt to help other researchers avoid and correct for Numerical Ventilation. Interface smearing caused by the simulations inability to track the freesurface is identified as the main source of Numerical Ventilation. This originates from the interface between the volume mesh and the prism layer mesh. This study looks into the interface to identify strategies that minimise Numerical Ventilation, presenting a novel solution to prism layer meshing that was found to have a positive impact. Through the implementation of a modified High Resolution Interface Capture (HRIC) scheme and the correct mesh refinements, it is possible to minimise the impact of Numerical Ventilation to a level that will not affect the results of a simulation and is acceptable for engineering applications

KW - CFD

KW - planing craft

KW - numerical ventilation

UR - https://event.asme.org/OMAE

M3 - Paper

SP - 1

EP - 10

ER -

Gray-Stephens A, Tezdogan T, Day S. Strategies to minimise numerical ventilation in CFD simulations of high-speed planing hulls. 2019. Paper presented at 38th International Conference on Ocean, Offshore & Arctic Engineering, Glasgow, United Kingdom.