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Research Papers: Flows in Complex Systems

Analysis of the Flow Past a Fully Appended Hull with Propellers by Computational and Experimental Fluid Dynamics

[+] Author and Article Information
Roberto Muscari1

Mario Felli

Andrea Di Mascio

 CNR–INSEAN, Rome, Italya.dimascio@insean.it

1

Corresponding author.

J. Fluids Eng 133(6), 061104 (Jun 16, 2011) (16 pages) doi:10.1115/1.4004215 History: Received January 13, 2011; Revised May 06, 2011; Published June 16, 2011; Online June 16, 2011

The flow in the stern region of a fully appended hull is analyzed by both computational and experimental fluid dynamics. The study is focused on the velocity field induced by the rotating propellers. Measurements have been performed by laser Doppler velocimetry (LDV) on the vertical midplane of the rudder and in two transversal planes behind the propeller and behind the rudder. In the numerical approach, the real geometry of the propeller has been considered. To this purpose, a dynamic overlapping grids method has been used, which is implemented in the unsteady Reynolds averaged Navier–Stokes equations ( URANSE) solver developed at INSEAN. Uncertainty analysis has been performed on both data sets and the results from the two approaches are compared. The agreement between the two data sets is found to be good, the deviation in the velocity and vorticity fields lying within the evaluated uncertainties. Numerical data allowed the analysis of further details of the flow that could not be measured, like load conditions of the single blades, interaction of the propeller wake with the rudder, and pressure oscillations induced by the propeller on the vault of the stern.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 4

Main contributions to the experimental uncertainty

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Figure 5

Detail of the mesh on the surface of the hull

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Figure 6

Details of the volume mesh—#1

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Figure 7

Details of the volume mesh—#2

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Figure 8

Details of the volume mesh—#3

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Figure 9

Open water characteristics for INSEAN E1630 model

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Figure 10

Thrust of the blades during one period

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Figure 11

Superposition of the four thrust curves

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Figure 12

Pressure distribution on the surface of the blades: left, pressure side; right suction side

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Figure 13

Visualization of vorticity field in the near wake of the propeller

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Figure 14

Pressure plots for all blades at r/R=0.50

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Figure 15

Pressure plots for the blade in the II quadrant at r/R=0.25,0.50,0.75

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Figure 16

Pressure comparison coarse–fine at r/R = 0.50

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Figure 17

Axial velocity in the midplane of the rudder. CFD (top) versus EFD (bottom).

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Figure 18

Transversal (i.e., Y-component) vorticity in the midplane of the rudder. CFD (top) versus EFD (bottom).

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Figure 19

Sample extraction line for results in Figs.  2021

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Figure 20

Axial velocity along the line in Fig. 1

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Figure 21

Transversal component of the vorticity along the line in Fig. 1

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Figure 22

Position of the transversal cuts in the computational field

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Figure 23

Transversal cut T1. Axial velocity (top) and axial vorticity (bottom).

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Figure 24

Interaction between the wakes of the shaft and of the fore bracket

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Figure 25

Transversal cut T3. Axial velocity, CFD (top) and EFD (bottom).

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Figure 26

Transversal cut T4. Axial velocity, CFD (top) and EFD (bottom).

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Figure 27

Visualization of vorticity field (top) and surface pressure on the rudder (bottom). Left: view of the pressure side; right: view of the suction side.

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Figure 28

Average value of the pressure on the stern vault

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Figure 29

Left to right, top to bottom: harmonics no. 1 (shaft frequency), 2, 3, 4 (blade frequency), 5, 8

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Figure 1

Side view of the hull model

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Figure 2

Front view of the propeller model

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Figure 3

Arrangement of the ship model in the test section

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