Ship-Model Correlation of Powering Performance on USS Oliver Hazard Perry, FFG-7 Class

1983 ◽  
Vol 20 (01) ◽  
pp. 35-52
Author(s):  
Everett L. Woo ◽  
Gabor Karafiath ◽  
Gary Borda
Keyword(s):  
Performance Prediction ◽  
Prediction Method ◽  
Model Tests ◽  
Trial Data ◽  
Full Scale ◽  
Ship Model ◽  
Single Screw ◽  
Post Trial ◽  
Model Correlation

Standardization trials were conducted on USS Oliver Hazard Perry (FFG-7) in May 1978. From the results of the trial data and the post-trial model correlation experiments which simulated the trial conditions, the powering correlation allowance of 0.00045 was obtained for the FFG-7. It should be noted that the pretrial model tests used the design correlation allowance of 0.0005 to predict full-scale powering performance. In addition, the powering performance was predicted using the "1978 ITTC Performance Prediction Method for Single Screw Ships."

Paper 11. Yaw Motion Stability; Twin-Screw, Twin-Rudder Ships—Some Model and Ship Results

1972 ◽  
Vol 14 (7) ◽  
pp. 75-79
Author(s):  
G. D. Thurman
Keyword(s):  
Model Test ◽  
Model Tests ◽  
Full Scale ◽  
Test Results ◽  
Motion Stability ◽  
Ship Model ◽  
Pull Out ◽  
Twin Screw ◽  
Model Correlation ◽  
Stability Results

This paper describes the pull-out manoeuvre as an indication of yaw motion stability. Results of model tests at the Admiralty Experiment Works and full-scale trials data are presented as a demonstration of ship/model correlation; additional model test results are given to illustrate use of the manoeuvre for detecting changes in stability due to alterations in ship configuration.

Scale Experiments with the 5.5 Metre Yacht ANTIOPE

1974 ◽  
Author(s):  
Karl L. Kirkman
Keyword(s):  
Performance Prediction ◽  
Full Scale ◽  
Hydrodynamic Performance ◽  
Prediction Methods ◽  
Ship Model ◽  
The Family

A program of Experiments with a series of four geometrically similar yacht hull models was conducted in the HYDRONAUTICS’ Ship Model Basin with the aim of improving engineering methods for model/full-scale correlation. The paper presents a brief review of the background of existing hydrodynamic performance prediction methods, outlines a number of scaling problems, and presents results from the family of models tested.

Correlation Allowances in Model Tests Results: A Delicate Balance Between Performance, Accuracy and Commercial Interests?

2016 ◽  
Author(s):  
Gerco Hagesteijn ◽  
Patrick Hooijmans ◽  
Karola van der Meij
Keyword(s):  
Model Test ◽  
Performance Prediction ◽  
Model Tests ◽  
Full Scale ◽  
Test Results ◽  
Power Performance ◽  
Low Light ◽  
Sea Trial ◽  
Performance Accuracy ◽  
Full Scale Tests

Model tests at ballast and design draught are used to convert the sea trial results from the ballast trial draught to the contractual design draught. Correlation allowances in model test results and their effect on the trial performance prediction are of major importance. Nowadays it is not only typical to verify the contract speed but also the EEDI certification requires a verification of the speed power performance of the vessel. The use of a to favorable CA-value may lead to attractive performance figures, but also leads to higher fuel consumption figures than expected. Furthermore the design point of the propeller is affected, which leads to a too low light running margin and in some cases to erosive cavitation. During a study, large spreading in the values of the correlation allowances for design draughts have been found for merchant vessels tested at different model test institutes, but at ballast trial draught the spreading is much less. Can it happen that some institutes select favorable correlations allowances on the basis of inaccurate trial data of shipyards? Or should we accept a large spreading in correlation allowances and have these indeed been confirmed by sea trials at design draught? This paper will present a discussion using the experience of a large full scale trial database as well as the accuracy of model and full scale tests.

Innovative Ice Protection for Shallow Water Drilling: Part II — SIB Model Testing in Ice

2008 ◽  
Author(s):  
Arne Gu¨rtner ◽  
Ove Tobias Gudmestad
Keyword(s):  
Shallow Water ◽  
Conceptual Design ◽  
Caspian Sea ◽  
Companion Paper ◽  
Model Testing ◽  
Model Tests ◽  
Full Scale ◽  
Ship Model ◽  
Water Developments ◽  
Broken Ice

Model tests on the Shoulder Ice Barrier (SIB) were performed in the large ice tank of the Hamburg Ship Model Basin (HSVA) during July 2007. The concept of the SIB has previously been presented in a companion paper under the same title at the OMAE 2006 (Gu¨rtner et al., 2006). Model tests were performed to investigate the conceptual design and force conditions under ice impact. Design conditions for the Northern Caspian Sea were assumed for the model tests. The characteristic shoulder sections’ inclination has been varied to investigate their contribution towards stabilizing broken ice and to prevent ice from over-riding. Ice up-riding onto the barrier contributes towards increased vertical forces. The global vertical forces showed to be higher than the global horizontal forces, and in particular when ice grounding was observed. Even under extreme rubble heights of up to 9.4 m (full scale), ice overtopping the structure was effectively prevented. The SIB showed the potential to be utilized as ice protection structure for future shallow water developments.

TELFER’S GEOSIM METHOD REVISITED BY CFD

2021 ◽  
Vol 161 (A4) ◽  
Author(s):  
C Delen ◽  
S Bal
Keyword(s):  
Fluid Dynamics ◽  
Performance Prediction ◽  
Prediction Method ◽  
Full Scale ◽  
Numerical Results ◽  
Navier Stokes ◽  
Container Ship ◽  
Ship Resistance ◽  
Full Compliance ◽  
The Difference

In this study, Telfer’s GEOSIM method for the computation of ship resistance at full scale has been applied by CFD (Computational Fluid Dynamics) approach. For this purpose, the KCS (KRISO Container Ship) hull has been investigated numerically with k-ε turbulence model for three different scales and full scale analyses by URANS (Unsteady Reynolds Averaged Navier-Stokes) method. Full scale ship resistance has been predicted using the numerical results computed at different model scales by Telfer’s GEOSIM method. The numerical results at three scales have also been extrapolated separately to that at full scale by ITTC 1978 performance prediction method. An experimental study has also been carried out at a model scale for validation. The results by Telfer’s GEOSIM method have been calculated almost in full compliance with those of CFD approach. While the difference between the results of CFD and those of ITTC extrapolation method is about 5% at full scale, the difference between the results of CFD and those of Telfer’s GEOSIM method has been found to be less than 1% at full scale. In addition, this method has been applied to estimate the nominal wake coefficient at full scale from model scales. A very good correlation has also been found for nominal wake coefficient.

Telfer’s GEOSIM Method Revisited by CFD

2019 ◽  
Vol 161 (A4) ◽  
Keyword(s):  
Fluid Dynamics ◽  
Performance Prediction ◽  
Prediction Method ◽  
Full Scale ◽  
Numerical Results ◽  
Navier Stokes ◽  
Container Ship ◽  
Ship Resistance ◽  
Full Compliance ◽  
The Difference

In this study, Telfer’s GEOSIM method for the computation of ship resistance at full scale has been applied by CFD (Computational Fluid Dynamics) approach. For this purpose, the KCS (KRISO Container Ship) hull has been investigated numerically with k-ε turbulence model for three different scales and full scale analyses by URANS (Unsteady Reynolds Averaged Navier-Stokes) method. Full scale ship resistance has been predicted using the numerical results computed at different model scales by Telfer’s GEOSIM method. The numerical results at three scales have also been extrapolated separately to that at full scale by ITTC 1978 performance prediction method. An experimental study has also been carried out at a model scale for validation. The results by Telfer’s GEOSIM method have been calculated almost in full compliance with those of CFD approach. While the difference between the results of CFD and those of ITTC extrapolation method is about 5% at full scale, the difference between the results of CFD and those of Telfer’s GEOSIM method has been found to be less than 1% at full scale. In addition, this method has been applied to estimate the nominal wake coefficient at full scale from model scales. A very good correlation has also been found for nominal wake coefficient.

Experimental Verifications of a Theoretical Procedure for Propeller-Induced Hull Pressure Calculations

1984 ◽  
Vol 21 (02) ◽  
pp. 119-133
Author(s):  
A. Colombo ◽  
B. Chilo'
Keyword(s):  
Computer Program ◽  
Full Scale ◽  
Pressure Amplitude ◽  
Towing Tank ◽  
Ship Model ◽  
Single Screw ◽  
Propeller Design ◽  
Experimental Values ◽  
New Generation ◽  
Theoretical Procedure

This paper describes the methodologies adopted by the Italian Ship Research Center to predict propeller-induced pressures. An outline of the developed computer program is given, and calculated pressure amplitude results for two ships are compared with the experimental values obtained from full-scale measurements. In particular, calculated pressure results, produced by three different propeller design solutions at several points on the stern of a new-generation single-screw roll-on/roll-off containership, are discussed and compared with the same quantities measured both on a ship model in the Depressurized Towing Tank of the Netherlands Ship Model Basin and on the full-scale ship fitted with the selected propeller.

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