An improved tip vortex cavitation model for propeller-rudder interaction

Naz Yilmaz, Mehmet Atlar, Patrick A. Fitzsimmons

Research output: Contribution to conferencePaper

Abstract

The paper starts with the computational modelling of the tip vortex cavitation in uniform flow conditions with an isolated propeller in detail and provides experimental validation. It then moves onto further modelling to include the effect of non-uniform flow and the presence of a rudder placed in the propeller slipstream. The propeller-rudder arrangement of the Newcastle University research vessel, The Princess Royal, and associated experimental data were used for Experimental Fluid Dynamics (EFD) analysis to validate the modelling. The cavitation simulations were conducted using commercial CFD software, Star CCM+. A new meshing technique, which utilizes a Mesh Adaptive Refinement approach for Cavitation Simulations (MARCS), recently developed by the authors, has been applied successfully to simulate the tip vortex cavitation, particularly to trace its extension up to the rudder in the propeller slipstream. The comparison of the CFD and EFD methods for the isolated propeller in cavitation tunnel conditions showed very good agreement in terms of the thrust and torque coefficients of the propeller as well as the sheet and tip vortex cavitation patterns observed. The cavitation simulations have been extended for the same propeller by using the new mesh refinement approach to include the effect of the hull wake and the presence of the rudder. Although the latter simulations fall short of the EFD results and hence they are still under development, the paper presents the developments and results so far to achieve the ultimate aim of this study, i.e. computational modelling of cavitating tip vortices of a propeller interacting with a rudder.

Conference

Conference10th International Cavitation Symposium (CAV2018)
CountryUnited States
CityBaltimore
Period13/05/1816/05/18

Fingerprint

Propellers
Cavitation
Vortex flow
Fluid dynamics
Computational fluid dynamics
Dynamic analysis
Stars
Tunnels
Torque

Keywords

  • tip vortex cavitation
  • EFD
  • CFD
  • propeller rudder interaction
  • fluid dynamics

Cite this

Yilmaz, N., Atlar, M., & Fitzsimmons, P. A. (2018). An improved tip vortex cavitation model for propeller-rudder interaction. Paper presented at 10th International Cavitation Symposium (CAV2018), Baltimore, United States.
Yilmaz, Naz ; Atlar, Mehmet ; Fitzsimmons, Patrick A. / An improved tip vortex cavitation model for propeller-rudder interaction. Paper presented at 10th International Cavitation Symposium (CAV2018), Baltimore, United States.6 p.
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keywords = "tip vortex cavitation, EFD, CFD, propeller rudder interaction, fluid dynamics",
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Yilmaz, N, Atlar, M & Fitzsimmons, PA 2018, 'An improved tip vortex cavitation model for propeller-rudder interaction' Paper presented at 10th International Cavitation Symposium (CAV2018), Baltimore, United States, 13/05/18 - 16/05/18, .

An improved tip vortex cavitation model for propeller-rudder interaction. / Yilmaz, Naz; Atlar, Mehmet; Fitzsimmons, Patrick A.

2018. Paper presented at 10th International Cavitation Symposium (CAV2018), Baltimore, United States.

Research output: Contribution to conferencePaper

TY - CONF

T1 - An improved tip vortex cavitation model for propeller-rudder interaction

AU - Yilmaz, Naz

AU - Atlar, Mehmet

AU - Fitzsimmons, Patrick A.

PY - 2018/5/16

Y1 - 2018/5/16

N2 - The paper starts with the computational modelling of the tip vortex cavitation in uniform flow conditions with an isolated propeller in detail and provides experimental validation. It then moves onto further modelling to include the effect of non-uniform flow and the presence of a rudder placed in the propeller slipstream. The propeller-rudder arrangement of the Newcastle University research vessel, The Princess Royal, and associated experimental data were used for Experimental Fluid Dynamics (EFD) analysis to validate the modelling. The cavitation simulations were conducted using commercial CFD software, Star CCM+. A new meshing technique, which utilizes a Mesh Adaptive Refinement approach for Cavitation Simulations (MARCS), recently developed by the authors, has been applied successfully to simulate the tip vortex cavitation, particularly to trace its extension up to the rudder in the propeller slipstream. The comparison of the CFD and EFD methods for the isolated propeller in cavitation tunnel conditions showed very good agreement in terms of the thrust and torque coefficients of the propeller as well as the sheet and tip vortex cavitation patterns observed. The cavitation simulations have been extended for the same propeller by using the new mesh refinement approach to include the effect of the hull wake and the presence of the rudder. Although the latter simulations fall short of the EFD results and hence they are still under development, the paper presents the developments and results so far to achieve the ultimate aim of this study, i.e. computational modelling of cavitating tip vortices of a propeller interacting with a rudder.

AB - The paper starts with the computational modelling of the tip vortex cavitation in uniform flow conditions with an isolated propeller in detail and provides experimental validation. It then moves onto further modelling to include the effect of non-uniform flow and the presence of a rudder placed in the propeller slipstream. The propeller-rudder arrangement of the Newcastle University research vessel, The Princess Royal, and associated experimental data were used for Experimental Fluid Dynamics (EFD) analysis to validate the modelling. The cavitation simulations were conducted using commercial CFD software, Star CCM+. A new meshing technique, which utilizes a Mesh Adaptive Refinement approach for Cavitation Simulations (MARCS), recently developed by the authors, has been applied successfully to simulate the tip vortex cavitation, particularly to trace its extension up to the rudder in the propeller slipstream. The comparison of the CFD and EFD methods for the isolated propeller in cavitation tunnel conditions showed very good agreement in terms of the thrust and torque coefficients of the propeller as well as the sheet and tip vortex cavitation patterns observed. The cavitation simulations have been extended for the same propeller by using the new mesh refinement approach to include the effect of the hull wake and the presence of the rudder. Although the latter simulations fall short of the EFD results and hence they are still under development, the paper presents the developments and results so far to achieve the ultimate aim of this study, i.e. computational modelling of cavitating tip vortices of a propeller interacting with a rudder.

KW - tip vortex cavitation

KW - EFD

KW - CFD

KW - propeller rudder interaction

KW - fluid dynamics

M3 - Paper

ER -

Yilmaz N, Atlar M, Fitzsimmons PA. An improved tip vortex cavitation model for propeller-rudder interaction. 2018. Paper presented at 10th International Cavitation Symposium (CAV2018), Baltimore, United States.