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Research Papers: CFD and VIV

Thruster and Hull Interaction

[+] Author and Article Information
Ye Tian, Spyros A. Kinnas

Department of Civil, Architectural and
Environmental Engineering,
The University of Texas at Austin,
Austin, TX 78712

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received August 12, 2014; final manuscript received March 24, 2015; published online April 17, 2015. Assoc. Editor: Daniel T. Valentine.

J. Offshore Mech. Arct. Eng 137(4), 041801 (Aug 01, 2015) (7 pages) Paper No: OMAE-14-1109; doi: 10.1115/1.4030254 History: Received August 12, 2014; Revised March 24, 2015; Online April 17, 2015

A hybrid method which couples a vortex-lattice method (VLM) solver and a Reynolds-Averaged Navier–Stokes (RANS) solver is applied to simulate the interaction between a dynamic positioning (DP) thruster and a floating production storage and offloading (FPSO) hull. The hybrid method can significantly reduce the number of cells to fifth of that in a full-blown RANS simulation and thus greatly enhance the computational efficiency. The numerical results are first validated with available experimental data, and then used to assess the significance of the thruster/hull interaction in DP systems.

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References

Kinnas, S. A., Chang, S.-H., He, L., and Johannessen, J. T., 2009, “Performance Prediction of a Cavitating Rim Driven Tunnel Thruster,” Proceedings of the First International Symposium on Marine Propulsors, SMP’09, Trondheim, Norway, pp. 435–442.
Kinnas, S. A., Chang, S.-H., Yu, Y.-H., and He, L., 2009, “A Hybrid Viscous/Potential Flow Method for the Prediction of the Performance of Podded and Ducted Propellers,” Proceedings of the Propeller and Shafting Conference, Williamsburg, VA, pp. 1–13.
Nienhuis, U., 1992, “Analysis of Thruster Effectivity for Dynamic Positioning and Low Speed Maneuvering,” Ph.D. thesis, Delft University of Technology, Delft, The Netherlands.
Ottens, H., and van Dijk, R., 2012, “Benchmark Study on Thruster-Hull Interaction in Current on a Semi-Submersible Crane Vessel,” ASME Paper No. OMAE2012-83125, pp. 527–538 [CrossRef].
Ottens, H., Bulten, N., and van Dijk, R., 2013, “Full Scale Cfd Validation on Thruster-Hull Interaction on a Semi-Submersible Crane Vessel in Transit Condition,” ASME Paper No. OMAE2013-10350, p. V007T08A022 [CrossRef].
Kerwin, J. E., Keenan, D., Black, S., and Diggs, J., 1994, “A Coupled Viscous/Potential Flow Design Method for Wake-Adapted, Multi-Stage, Ducted Propulsors Using Generalized Geometry. Discussion. Authors’ Closure,” SNAME Trans., 102, pp. 23–56.
Choi, J.-K., 2000, “Vortical Inflow-Propeller Interaction Using an Unsteady Three-Dimensional Euler Solver (UT-OE Report No. 00-1),” Ph.D. thesis, The University of Texas at Austin, Austin, TX.
Choi, J.-K., and Kinnas, S. A., 2001, “Prediction of Non-Axisymmetric Effective Wake by a Three-Dimensional Euler Solver,” J. Ship Res., 45(1), pp. 13–33.
Kinnas, S. A., Chang, S.-H., Tian, Y., and Jeon, C.-H., 2012, “Steady and Unsteady Cavitating Performance Prediction of Ducted Propulsors,” The 22nd International Offshore (Ocean) and Polar Engineering Conference and Exhibition, Rhodes (Rodos), Greece, pp. 937–943.
Tian, Y., Jeon, C.-H., and Kinnas, S. A., 2014, “On the Accurate Calculation of Effective Wake/Application to Ducted Propellers,” J. Ship Res., 58(2), pp. 70–82 [CrossRef].
Tian, Y., and Kinnas, S. A., 2013, “A Numerical Method for the Performance Prediction of Bow Thrusters,” 18th Offshore Symposium Texas Section of the Society of Naval Architects and Marine Engineers, Houston, TX, pp. 149–159.
Lee, C.-S., 1979, “Prediction of Steady and Unsteady Performance of Marine Propellers With or Without Cavitation by Numerical Lifting Surface Theory,” Ph.D. thesis, MIT, Boston, MA.
He, L., 2010, “Numerical Simulation of Unsteady Rotor/Stator Interaction and Application to Propeller/Rudder Combination (Also UT-OE Report 10-05),” Ph.D. thesis, The University of Texas at Austin, Austin, TX.
Jessup, S. D., 1989, “An Experimental Investigation of Viscous Aspects of Propeller Blade Flow,” Ph.D. thesis, The Catholic University of America, Washington, DC.
Dyne, G., 1973, “Systematic Studies of Accelerating Ducted Propellers in Axial and Incline Flows,” Proceedings of the Symposium on Ducted Propellers, The Royal Institution of Naval Architects, pp. 114–124.

Figures

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Fig. 1

VLM grid 18 (spanwise) × 20 (chordwise) for open propeller DTMB 4119

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Fig. 2

Comparison of the performance predicted by potential flow solvers and measured in experiment, for DTMB 4119

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Fig. 3

Schematic plot of the control points where the effective wake is evaluated

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Fig. 4

Schematic diagram of the coupling algorithm

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Fig. 5

Axial body force distribution at J = 0.7 for a propeller in a duct with round trailing edge, normalized by the inflow velocity U

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Fig. 6

Axial velocity and streamlines around the duct at J = 0.7, from Ref. [10], the velocity is normalized by nD

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Fig. 7

Comparison of the predicted propeller and duct forces and the experimental measurement, from Ref. [10]

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Fig. 8

Comparison of the detailed pressure distributions from the hybrid method and the full-blown RANS simulation for a ducted propeller at J = 0.4. The propeller was investigated by Dyne [15]. (a) r/R = 0.65 and (b) r/R = 0.8.

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Fig. 9

Three-dimensional view of the computational domain

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Fig. 10

Detailed dimensions of the computational domain

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Fig. 11

Dimensions of hull

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Fig. 12

Surface RANS grid on the duct and the hub

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Fig. 13

Cross section of the hub and the duct, normalized by nD

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Fig. 14

VLM grid for the propeller P-4929

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Fig. 15

Comparison of the axial velocity (in m/s) profile at 857 rpm between the numerical prediction and experimental measurement, at three different cutting planes whose locations are shown in Fig. 16. The experimental data are extracted from Fig. 3.37 in Ref. [3], p. 88.

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Fig. 16

Axial velocity (in m/s) contour at 857 rpm in a vertical cutting plane passing the center of thruster

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Fig. 17

RANS grid at the z = 0 plane, before and after refinement

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Fig. 18

Effective wake at a cutting plane passing the center of the thruster, normalized by nD, where n and D present the RPS and the diameter of the propeller, respectively

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Fig. 19

Axial velocity (in m/s) when the DP thruster working at 857 rpm in open water on bollard pull condition

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