A Numerical and Experimental Procedure for the Open Water Characteristics of Contra-Rotating Propellers for EEDI Improvement

2013 ◽  
Vol 16 (4) ◽  
pp. 248-254 ◽  
Author(s):  
Moon Chan Kim ◽  
Mu Seok Song ◽  
Hyeon Ji Kang ◽  
Dong Eon Kim
Keyword(s):  
Open Water ◽  
Experimental Procedure ◽  
Water Characteristics

Experimental and Numerical Investigation of DARPA Suboff Submarine Propelled with INSEAN E1619 Propeller for Self-Propulsion

2019 ◽  
Vol 63 (4) ◽  
pp. 235-250
Author(s):  
Yasemin Arıkan Özden ◽  
Münir Cansın Özden ◽  
Ersin Demir ◽  
Sertaç Kurdoğlu
Keyword(s):  
Open Water ◽  
Test Method ◽  
The Self ◽  
Propulsive Efficiency ◽  
Ship Model ◽  
Rotation Rates ◽  
Water Characteristics ◽  
Numerical Studies ◽  
Computational Fluid Dynamics Cfd ◽  
Thrust And Torque

The Defense Advanced Research Projects Agency (DARPA) Suboff Submarine propelled by the Italian Ship Model Basin (INSEAN) E1619 propeller is extensively used in submarine validation studies. Although there are several numerical studies where the DARPA Suboff submarine is used in combination with E1619 propeller there are no experimental data available in open literature for the self-propulsion condition. In this article, the self-propulsion characteristics of the DARPA Suboff submarine model with INSEAN E1619 propeller obtained with experimental and numerical methods are presented and discussed by means of Taylor wake fraction, thrust deduction, hull efficiency, relative rotative efficiency, and propulsive efficiency. To experimentally investigate the submarine form, a self-propulsion experimental setup is designed and manufactured. Resistance and self-propulsion experiments are conducted in Istanbul Technical University Ata Nutku Ship Model Testing Laboratory. Resistance tests are carried out for three different speeds, and the results show good agreement with the published experimental results. Propulsion tests are conducted by using the load-varying self-propulsion test method for constant speed and seven different propeller rotation rates. Rotational speed, thrust, and torque forces at self-propulsion point are investigated. For the numerical computations a commercial Computational Fluid Dynamics (CFD) code is used. Propeller open water characteristics and nondimensional velocities behind the propeller are calculated. Self-propulsion point of the submarine and propeller assembly is also solved numerically and the results are compared with the results obtained from the experiments, and it is seen that especially the propeller rate of revolution and thrust force are predicted with very good approximation.

scholarly journals Experimental and Numerical Validation of the Improved Vortex Method Applied to CP745 Marine Propeller Model

2018 ◽  
Vol 25 (2) ◽  
pp. 57-65 ◽  
Author(s):  
Przemysław Król ◽  
Krzysztof Tesch
Keyword(s):  
Simple Algorithm ◽  
Open Water ◽  
Vortex Method ◽  
Marine Propeller ◽  
Cfd Simulations ◽  
Surface Approach ◽  
Water Characteristics ◽  
Propeller Blades ◽  
Numerical Approaches

Abstract The article presents a numerical analysis of the CP745 marine propeller model by means of the improved vortex method and CFD simulations. Both numerical approaches are validated experimentally by comparing with open water characteristics of the propeller. The introduced modification of the vortex method couples the lifting surface approach for the propeller blades and the boundary element method for the hub. What is more, a simple algorithm for determination of the propeller induced advance angles is established. The proposed modifications provide better results than the original version of the vortex method. The accuracy of the improved method becomes comparable to CFD predictions, being at the same time a few hundred times faster than CFD.

Numerical Study on the Performance Analysis and Vibration Characteristics of Flexible Marine Propeller

2020 ◽  
Author(s):  
Kumar S. Ashok ◽  
Subramanian V. Anantha ◽  
R. Vijayakumar
Keyword(s):  
Performance Analysis ◽  
Numerical Study ◽  
Open Water ◽  
Simulation Method ◽  
Mode Shapes ◽  
Thrust Coefficient ◽  
Fluid Structure ◽  
Marine Propellers ◽  
Water Characteristics ◽  
Wet Condition

Abstract This paper addresses the hydro-elastic performance of two composite marine propellers at operating condition and compares the results with conventional materials. The study involves three stages namely, design and development of a B series propeller, hydrodynamic and structural performance analysis in uniform flow and free vibration test both in dry and wet condition. In order to perform the hydro-elastic based fluid structure interaction (FSI), Co-Simulation method was adopted to couple Reynolds Averaged Navier-Strokes Equation (RANSE) based Computational Fluid Dynamics (CFD) solver and finite element method (FEM) solvers. The open water characteristics such as thrust coefficient (KT), torque coefficient (KQ), and open water efficiency (ηO) were analyzed as a function of advance velocity (J) of the propeller. A detailed study of the various blade materials by varying mechanical properties are presented. The results obtained show the variation of stress and deflection on the blade, along with the influence of the blade deformation on the performance of propeller. The vibration behaviour of the propellers were also analysed by Block-Lanczos method in FEM solver to obtain the natural frequencies and the mode shapes using Acoustic Fluid-Structure Coupling method for both dry and wet condition. Results showed that composite propeller have better hydro-dynamic property and lower vibration than metal propeller.

Scale effects on open water characteristics of a controllable pitch propeller working within different duct designs

2016 ◽  
Vol 112 ◽  
pp. 226-242 ◽  
Author(s):  
Anirban Bhattacharyya ◽  
Vladimir Krasilnikov ◽  
Sverre Steen
Keyword(s):  
Scale Effects ◽  
Open Water ◽  
Water Characteristics

SPH Simulations of Ship Propeller Induced Harbour Bed Erosion

2012 ◽  
Author(s):  
Christian Ulrich ◽  
Thomas Rung
Keyword(s):  
Open Water ◽  
Local Flow ◽  
Stress Criterion ◽  
Counter Measures ◽  
Water Characteristics ◽  
Bed Erosion ◽  
Particle Hydrodynamics ◽  
Suspension Layer ◽  
Smoothed Particle ◽  
Ship Propeller

The paper reports on the predictive prospects of Smoothed-Particle-Hydrodynamics (SPH) for simulations of ship propeller induced scours in harbours. Such erosions represent unpleasant phenomena, especially if they occur close to quay walls, and generate cost intensive counter measures. These measures are usually based on a rather weak background knowledge. SPH simulations can help to analyse the erosional processes and to understand the interaction between ship, water, soil and structure. In the present research, a body-force propulsor model based on the open water characteristics is used to represent the ship’s propeller. The evolution of the liquid and granular phase particles is obtained from an SPH-integration of the continuity and momentum equations. The fluid is considered to be Newtonian and the viscosity of the soil-phase is modelled in line with the Mohr-Coulomb yield stress criterion. Water and soil particles interacting in a suspension layer are assigned to a viscosity that is derived from a Chézy-relation between the shear stress and the local flow velocity. A variable particle resolution strategy is applied to handle large domains, in which the areas around the ship hull demand a fine resolution. A complex full-scale application example included refers to the starting sequence of a container ship propeller.

scholarly journals Heeling Moment Acting on a River Cruiser in Manoeuvring Motion

2016 ◽  
Vol 23 (1) ◽  
pp. 45-51
Author(s):  
Tomasz Tabaczek ◽  
Jan Kulczyk
Keyword(s):  
Numerical Integration ◽  
Open Water ◽  
Theoretical Method ◽  
Small River ◽  
Centrifugal Forces ◽  
Water Characteristics ◽  
Ducted Propeller ◽  
Time Histories ◽  
Heeling Moment

Abstract By using fully theoretical method the heeling moment due to centrifugal forces has been determined for a small river cruiser in turning manoeuvre. The authors applied CFD software for determination of hull hydrodynamic forces, and open water characteristics of ducted propeller for estimation of thrust of rudder-propellers. Numerical integration of equations of 3DOF motion was used for prediction of ship trajectory and time histories of velocities, forces and heeling moment.

scholarly journals The Effect of Propeller Scaling Methodology on the Performance Prediction

2018 ◽  
Author(s):  
Stephan Helma ◽  
Heinrich Streckwall ◽  
Jan Richter
Keyword(s):  
Open Water ◽  
Single Step ◽  
Complex Nature ◽  
Power Prediction ◽  
Water Characteristics ◽  
Scaling Procedure ◽  
Interaction Factors ◽  
Inherent Problem ◽  
Derivatives Of

In common model testing practise, the measured values of the self propulsion test are split into the characteristics of the hull, the propeller and into the interaction factors. These coefficients are scaled separately to the respective full scale values and subsequently reassembled to give the power prediction. The accuracy of this power prediction depends {\em inter alia} on the accuracy of the measured values and the scaling procedure. An inherent problem of this approach is, that it is virtually impossible to verify each single step, because of the complex nature of the underlying problem. In recent years the scaling of the open-water characteristics of propeller model tests attracted a renewed interest, fuelled by competitive tests, which became the norm due to requests of the customer. This paper will show the influence of different scaling procedures on the predicted power. The prediction is compared to the measured trials data and the quality of the prediction will be judged. The procedures examined are the standard ITTC~1978 procedure plus derivatives of it: the Meyne, the strip method and the βᵢ-method.

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