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Large eddy simulation of crashback i...

Vysohlid, Martin.

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Large eddy simulation of crashback in marine propellers.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Large eddy simulation of crashback in marine propellers./
Author:	Vysohlid, Martin.
Description:	93 p.
Notes:	Adviser: Krishnan Mahesh.
Contained By:	Dissertation Abstracts International68-05B.
Subject:	Engineering, Marine and Ocean. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3266766
ISBN:	9780549053347

Large eddy simulation of crashback in marine propellers.
Vysohlid, Martin.

Large eddy simulation of crashback in marine propellers. - 93 p.

Adviser: Krishnan Mahesh.

Thesis (Ph.D.)--University of Minnesota, 2007.

Crashback is an important mode of operation of marine propellers, which affects maneuverability and often determines the requirements on strength of propeller blades. This work uses the large eddy simulation approach to predict and understand the unsteady flow in crashback. In a broader sense this work demonstrates the suitability of large eddy simulation to compute highly separated, complex external flows at high Reynolds numbers.

ISBN: 9780549053347Subjects--Topical Terms:

1019064
Engineering, Marine and Ocean.

Large eddy simulation of crashback in marine propellers.
LDR:03296nam 2200325 a 45 001 939609
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008 110517s2007 ||||||||||||||||| ||eng d
020 $a 9780549053347
035 $a (UMI)AAI3266766
035 $a AAI3266766
040 $a UMI $c UMI
100 1 $a Vysohlid, Martin. $3 1263711
245 1 0 $a Large eddy simulation of crashback in marine propellers.
300 $a 93 p.
500 $a Adviser: Krishnan Mahesh.
500 $a Source: Dissertation Abstracts International, Volume: 68-05, Section: B, page: 3318.
502 $a Thesis (Ph.D.)--University of Minnesota, 2007.
520 $a Crashback is an important mode of operation of marine propellers, which affects maneuverability and often determines the requirements on strength of propeller blades. This work uses the large eddy simulation approach to predict and understand the unsteady flow in crashback. In a broader sense this work demonstrates the suitability of large eddy simulation to compute highly separated, complex external flows at high Reynolds numbers.
520 $a A non-dissipative, robust numerical algorithm developed by Mahesh et al. (2004, J. Comput. Phys., 197:215{240) for unstructured grids was extended to perform large eddy simulation in rotating frame of reference, and applied to flow around a marine propeller. First, flow in forward mode was computed and agreement with experiment was observed in propeller thrust and torque. Then the flow in crashback was computed and good agreement with experiment in mean value, standard deviation and power spectral density of thrust, torque and side-forces, as well as in circumferentially averaged mean velocity and turbulent kinetic energy was obtained. The dependence of unsteady performance of propeller on advance ratio was also investigated and good agreement was obtained, except for magnitude of side-forces at the lowest absolute value of advance ratio. It was shown that this disagreement was due to the effect of water tunnel geometry.
520 $a The crashback simulation shows the presence of highly unsteady, irregular recirculation region, called propeller ring vortex. The results suggest that this region be viewed as a system of several interacting vortices, and not as a single coherent ring vortex. The dynamics of the propeller ring vortex were examined, and related to the unsteady loads experienced by the propeller. A new feature of the flow was identified---spiral shape blade-root vortices, originating at the hub near the roots of the blades. Their evolution and effect on blade pressure was described.
520 $a An unsteady actuator disk model was constructed and similar modes of operation as in propeller were observed. The mode similar to propeller crashback was investigated and correspondence between the fluctuations of thrust and the behavior of the ring vortex was observed. Similarities and differences between the disk model and the real propeller were examined.
590 $a School code: 0130.
650 4 $a Engineering, Marine and Ocean. $3 1019064
690 $a 0547
710 2 $a University of Minnesota. $b Aerospace Engineering. $3 1263712
773 0 $t Dissertation Abstracts International $g 68-05B.
790 $a 0130
790 1 0 $a Longmire, Ellen K. $e committee member
790 1 0 $a Mahesh, Krishnan, $e advisor
790 1 0 $a Strykowski, Paul J. $e committee member
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3266766