Research Papers: Flows in Complex Systems

Integral Force/Moment Waterjet Model for CFD Simulations

[+] Author and Article Information
Manivannan Kandasamy, Seng Keat Ooi, Pablo Carrica

IIHR-Hydroscience and Engineering, The University of Iowa, Iowa City, IA 52242

Frederick Stern1

IIHR-Hydroscience and Engineering, The University of Iowa, Iowa City, IA 52242frederick-stern@uiowa.edu


Corresponding author.

J. Fluids Eng 132(10), 101103 (Oct 20, 2010) (9 pages) doi:10.1115/1.4002573 History: Received February 02, 2008; Revised August 25, 2010; Published October 20, 2010; Online October 20, 2010

An integral force/moment waterjet model for computational fluid dynamics (CFD) is derived for ship local flow/powering predictions, including sinkage and trim. The waterjet induced reaction forces and moment and waterjet/hull interaction stern force replicate the effects of the waterjet without requiring detailed simulations of the waterjet system. The model extends the International Towing Tank Conference (ITTC) waterjet model for sinkage and trim by using an alternative control volume also appropriate for CFD and by including vertical forces and pitching moment in the waterjet/hull force/moment balance. The same grid is used for both without and with waterjet simulations. The CFD waterjet model requires limited waterjet geometry (inlet and outlet areas and locations, and weight of working fluid) and several waterjet flow (mass flow rate, inlet pressure force, inlet and outlet momentum correction factors and flow angles, and stern force and location) input variables. The CFD waterjet model can be used for local flow predictions by using waterjet flow input variables provided by ITTC waterjet model test data, including additional data for waterjet induced inlet pressure and stern forces. It can also be used for powering predictions once waterjet flow input variable correlations are available based on CFD for the waterjet system and/or experimental data. The CFD waterjet model is demonstrated for local flow predictions for the DTMB 5594 high-speed sealift ship model for which ITTC waterjet model test data, including additional data for waterjet induced stern forces, are available. Correlations for the waterjet flow input variables are shown to be feasible using a combination of CFD and experimental data for the waterjet system for three different hulls.

Copyright © 2010 by American Society of Mechanical Engineers
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Figure 1

ITTC waterjet model control volume

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Figure 2

CFD waterjet model control volume

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Figure 3

Forces and moments on a towed ship model: (a) bare hull simulation and (b) waterjet-propelled simulation

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Figure 4

Overset grid design and boundary conditions

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Figure 5

CP on the model afterbody

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Figure 6

Contours of bare hull axial velocity upstream of the waterjet inlets at X/L=0.96

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Figure 7

Forces and motions: (a) bare hull CTX and self-propelled RX for three different hull forms, (b) thrust deduction, (c) sinkage, and (d) trim

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Figure 8

Vertical forces: (a) vertical forces versus Fr, (b) vertical forces versus IVR, and (c) vertical force component ratio variation with IVR

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Figure 9

Inlet flow angles: (a ) Φ versus IVR (b) Φ/Φ/ versus IVR

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Figure 10

Momentum correction factors at Ain

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Figure 11

Correlation of vertical force coefficients



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