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Research Papers: Flows in Complex Systems

Time-Accurate Analysis of the Viscous Flow Around Puller Podded Drive Using Sliding Mesh Method

[+] Author and Article Information
Reza Shamsi

Department of Ocean Engineering,
Amirkabir University of Technology,
Hafez Avenue,
P.O. Box 15875-4413,
Tehran, Iran
e-mail: shamsi@aut.ac.ir

Hassan Ghassemi

Department of Ocean Engineering,
Amirkabir University of Technology,
Hafez Avenue,
P.O. Box 15875-4413,
Tehran, Iran
e-mail: gasemi@aut.ac.ir

David Taylor Model Basin.

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received October 12, 2013; final manuscript received February 27, 2014; published online September 10, 2014. Assoc. Editor: Samuel Paolucci.

J. Fluids Eng 137(1), 011101 (Sep 10, 2014) (9 pages) Paper No: FE-13-1608; doi: 10.1115/1.4027143 History: Received October 12, 2013; Revised February 27, 2014

In this paper a computational method is presented for predicting the unsteady hydrodynamic forces acting on podded drive components. These numerical simulations are performed with the aim of accurately studying the interaction between the propeller, the pod, and the strut. In order to simulate the unsteady viscous flow around a puller type podded drive, a Reynolds-Averaged Navier–Stokes (RANS) solver is used. The time-accurate calculations are made by applying the sliding mesh method. Structured and unstructured mesh techniques are used for the propeller and podded drive. The method is applied in the case of the straight condition. The unsteady propeller thrust and torque coefficient fluctuations are predicted for advance velocity ratios ranging from 0.2 to 1.0. The time averaged forces of the podded drive obtained by an unsteady analysis are compared to and verified by the steady result and the experimental data. Finally, discrepancies between the simulation results and the experimental data have been quantitatively evaluated in terms of the relative percentage error for the propulsive characteristics.

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References

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Figures

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Fig. 1

Podded drive views

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Fig. 2

Computational domain

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Fig. 3

Variation of error value of the thrust and torque coefficients with increasing the number of cells at J = 0.6

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Fig. 4

Sliding interfaces

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Fig. 5

Propeller torque coefficient convergence at J = 0.6

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Fig. 6

(a) Thrust coefficient and (b) torque coefficient of the blades in one revolution of propeller at J = 0.6

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Fig. 7

(a) Unsteady and time-averaged values and (b) fluctuations of propeller thrust and torque coefficients at J = 0.2

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Fig. 8

(a) Unsteady and time-averaged values and (b) fluctuations of propeller thrust and torque coefficients at J = 0.4

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Fig. 9

(a) Unsteady and time-averaged values and (b) fluctuations of propeller thrust and torque coefficients at J = 0.6

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Fig. 10

(a) Unsteady and time-averaged values and (b) fluctuations of propeller thrust and torque coefficients at J = 0.8

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Fig. 11

(a) Unsteady and time-averaged values and (b) fluctuations of propeller thrust and torque coefficients at J = 1.0

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Fig. 12

Steady and unsteady values of (a) propeller thrust and torque coefficients and (b) axial force and side force coefficients

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