Benchmark CFD validation data for surface combatant 5415 in PMM maneuvers – Part II: Phase-averaged stereoscopic PIV flow field measurements

Abstract

Part II of this two-part paper presents CFD benchmark local flow field measurements for a surface combatant in dynamic planar-motion-mechanism (PMM) maneuvers. Phase-averaged stereoscopic particle-image-velocimetry (PIV) measurements are performed for pure sway and pure yaw maneuvers. The geometry is DTMB model 5512, a 3.048 m geosim of DTMB model 5415. The experiments aredone in a 100 m × 3 m × 3 m towing tank. The measurement system is a custom-designed towingtank maneuvering test flow-mapping system, which features a PMM for captive model testing with an integrated stereoscopic PIV. Statistical convergence error is defined and monitored by using the confidence intervalsof the mean and variance. The quality of data is also assessed by following standard uncertainty assessmentprocedures.The present experimental dataare cross-referenced with computational simulations for identification of the major vortices in the flow. The core locations and trajectories of the major vortices are traced and the flow variables at the core locationsare analyzed.The tests of both Parts I and II are sufficiently documented and detailed to be useful as experimental benchmark data for validation of computational fluid dynamicscodes.Part I presents the force/moment/motion measurements.

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

“…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).…”

“…Sakamoto et al 25,26 studied a DTMB 5415 bare hull in static and dynamic PMM tests based on CFD methods and validated the computed hydrodynamic forces and flow features with the model test data. 6,7 In the above-mentioned studies, [17][18][19][20][21][22][23][24][25][26] the CFD-based manoeuvring predictions were mostly conducted with zero sinkage and trim or given sinkage and trim, consequently reducing the computational effort, but may bring some error. Most recently, Hochbaum and Uharek 27 and Quadvlieg 28 pointed out that the comparisons among numerical results from different institutions for the KCS ship under the same manoeuvring condition were not satisfactory.…”

“…Sakamoto et al 25,26 studied a DTMB 5415 bare hull in static and dynamic PMM tests based on CFD methods and validated the computed hydrodynamic forces and flow features with the model test data. 6,7…”

Stereo Particle Image Velocimetry Measurements of the Wake Fields Behind A Panamax Bulker Ship Model Under the Ballast Condition

“…For bulk carriers, the ballast condition accounts for almost 50% of the total operation time [4]. Our previous paper [2] described in detail the measurement of the wake fields based on the PIV under the design-loading condition, and most of the literature focuses on the flow characteristics around the hulls under the design conditions [5][6][7][8][9][10][11][12][13]. The flow characteristics around the ship under the ballast condition is different from that under the design condition with the change in the draft, inclination angle, and the float status.…”

Investigation of the Flow Field of a Ship in Planar Motion Mechanism Tests by the Vortex Identification Method

“…Simonsen and Stern [12] simulated the pure yaw test of KRISO Container Ship (KCS) and analyzed the uncertainty of forces/moments acting on the hull. Sakamoto et al [13,14] and Yoon et al [15,16] used the solver, CFD Ship-Iowa, to simulate the static and dynamic PMM tests of DTMB 5415. The predicted hydrodynamic derivatives were compared with the test results, and the highest number of errors of linear hydrodynamic derivatives was less than 10%.…”