Circular motion tests and uncertainty analysis for ship maneuverability

Ueno, Michio; Yoshimura, Y.; Tsukada, Yoshiaki; Miyazaki, Hiroyuki

doi:10.1007/s00773-009-0065-2

Cited by 29 publications

(9 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The validation results of X ′, Y ′, N ′ and F ′ N of these three cases are shown in Table 7. It should be noted that the experimental data D are obtained from SIMMAN 2014 submitted by NMRI, 11 and the corresponding experimental uncertainty u exp is published in Ueno et al 9 under the condition of hull with rudder and propeller. No specific experimental uncertainty assessment is made for the un-propelled static rudder or static rudder case, so the experimental uncertainty u exp estimated from the propelled 12° drift case is applied, assuming that the percentage is the same as the un-propelled ones discussed here.…”

Section: Resultsmentioning

confidence: 99%

“…Input uncertainty is usually determined analytically or solved by propagation techniques. 40 The numerical uncertainty is obtained by equation (9). To determine the validation uncertainty u val , only numerical (u num ) and experimental (u exp ) uncertainties are considered since the uncertainty caused by the input parameter is minor.…”

Section: Methodsmentioning

confidence: 99%

“…6 Thus, the demand of experimental assessment of hydrodynamic forces on the ship during captive model tests under fixed or free sinkage and trim condition is increasing. Yoon et al 6,7 carried out PMM tests for a David Taylor Model Basin (DTMB) model 5415 hull and investigated the sinkage and trim effects based on the test results; Kume et al 8 conducted the same tests with zero sinkage and trim and Ueno et al 9 with free sinkage and trim for a 2nd Variant of the KRISO Very Large Crude-oil Carrier (KVLCC2); Longo and Stern 10 studied the drift angle effect on the sinkage and trim for a Series 60. In addition, there are many experimental studies with the KRISO Container Ship (KCS) model conducted at several institutions, such as National Maritime Research Institute (NMRI), 11 Hiroshima University (HU) 12 and most recently at Hyundai Maritime Research Institute (HMRI).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Computational fluid dynamics prediction of hydrodynamic forces on a manoeuvring ship including effects of dynamic sinkage and trim

Liu

Zou

2017

Proceedings of the Institution of Mechanical Engineers, Part M:

View full text Add to dashboard Cite

Understanding the manoeuvring performance of a ship requires accurate predictions of the hydrodynamic forces and moments on the ship. In the present study, the hydrodynamic forces and moments on a manoeuvring container ship at various rudder and drift angles are numerically predicted by solving the unsteady Reynolds-averaged Navier-Stokes equations. The effects of dynamic sinkage and trim on the hydrodynamic forces are first investigated together with a grid dependency study to estimate the numerical error and uncertainty caused by grid discretization, and with a validation study combining the experimental data. The results show that the effect of dynamic sinkage and trim is non-negligible, since including it improves the hydrodynamic force predictions and reduces the numerical error and uncertainty, and the averaged error and uncertainty are smaller than the other computational fluid dynamics results where sinkage and trim were fixed with given values from model tests. Therefore, it is included in the subsequent systematic simulations regarding the influence of rudder and drift angles. The computed forces, moments and rudder coefficients at different rudder and drift angles on the container ship are compared with the benchmark model test data. From the computations, all the predicted quantities are in satisfactory agreement with the experimental data. The details of the flow filed and hydrodynamic forces, such as pressure distributions, transverse force distributions along the hull, velocity contours, streamlines and wave patterns are presented and discussed, and a deep insight into the physical mechanism in the hydrodynamic forces on a manoeuvring ship is obtained.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Computational fluid dynamics prediction of hydrodynamic forces on a manoeuvring ship including effects of dynamic sinkage and trim

Liu

Zou

2017

Proceedings of the Institution of Mechanical Engineers, Part M:

View full text Add to dashboard Cite

show abstract

“…The sample ship studied here is the bare KVLCC2 tanker model. This ship is a very popular test model, and many experimental and CFD test results for this model are open to the public and have been discussed in workshops and conferences [14][15][16]. Table 1 shows the main particulars.…”

Section: Model Ship Descriptionmentioning

confidence: 99%

Manoeuvring Prediction of KVLCC2 with Hydrodynamic Derivatives Generated by a Virtual Captive Model Test

Dai

2019

Polish Maritime Research

View full text Add to dashboard Cite

This paper describes the application of computational fluid dynamics rather than a towing tank test for the prediction of hydrodynamic derivatives using a RANS-based solver. Virtual captive model tests are conducted, including an oblique towing test and circular motion test for a bare model scale KVLCC2 hull, to obtain linear and nonlinear hydrodynamic derivatives in the 3rd-order MMG model. A static drift test is used in a convergence study to verify the numerical accuracy. The computed hydrodynamic forces and derivatives are compared with the available captive model test data, showing good agreement overall. Simulations of standard turning and zigzag manoeuvres are carried out with the computed hydrodynamic derivatives and are compared with available experimental data. The results show an acceptable level of prediction accuracy, indicating that the proposed method is capable of predicting manoeuvring motions.

show abstract

“…Even when other special techniques are used, such as a bent model [19], which reproduces the effects of curved flow in a straight flow field, or a special wind tunnel with a rotating test section [20] designed to cancel out the radial pressure distribution, it is difficult to precisely and flexibly reproduce the relative flow acting on a cornering vehicle. On the other hand, a ship model basin for a towing test, which is generally used to measure the hydrodynamic force acting on a ship model, can measure the fluid-dynamic forces under steady-state cornering conditions, which is the so-called circular motion test (CMT) [21]. Such towing tank facilities can directly apply the cornering motion to a vehicle model, without requiring the Galilean transformation assumed in wind tunnel measurements.…”

Section: Introductionmentioning

confidence: 99%

Fluid-Dynamic Force Measurement of Ahmed Model in Steady-State Cornering

et al. 2020

View full text Add to dashboard Cite

The effects of on-road disturbances on the aerodynamic drag are attracting attention in order to accurately evaluate the fuel efficiency of an automobile on a road. The present study investigated the effects of cornering motion on automobile aerodynamics, especially focusing on the aerodynamic drag. Using a towing tank facility, measurements of the fluid-dynamic force acting on Ahmed models during steady-state cornering were conducted in water. The investigation included Ahmed models with slant angles θ = 25° and 35°, reproducing the wake structures of two different types of automobiles. The drag increase due to steady-state cornering motion was experimentally measured, and showed good agreement with previous numerical research, with the measurements conducted at a Reynolds number of 6 × 105, based on the model length. The Ahmed model with θ = 35° showed a greater drag increase due to the steady-state cornering motion than that with θ = 25°, and it reached 15% of the total drag at a corner with a radius that was 10 times the vehicle length. The results indicated that the effect of the cornering motion on the automobile aerodynamics would be more important, depending on the type of automobile and its wake characteristics.

show abstract

Circular motion tests and uncertainty analysis for ship maneuverability

Cited by 29 publications

References 1 publication

Computational fluid dynamics prediction of hydrodynamic forces on a manoeuvring ship including effects of dynamic sinkage and trim

Computational fluid dynamics prediction of hydrodynamic forces on a manoeuvring ship including effects of dynamic sinkage and trim

Manoeuvring Prediction of KVLCC2 with Hydrodynamic Derivatives Generated by a Virtual Captive Model Test

Fluid-Dynamic Force Measurement of Ahmed Model in Steady-State Cornering

Contact Info

Product

Resources

About