Overview of the state-of-the-practice of computational fluid dynamics in advanced propulsion system design

1997 ◽  
Author(s):  
Munir Sindir ◽  
E. Lynch ◽  
Munir Sindir ◽  
E. Lynch
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
System Design ◽  
The State ◽  
Propulsion System

The Energy Efficient Engine (E3): Advancing the State of the Art

1980 ◽  
Author(s):  
W. B. Gardner ◽  
D. E. Gray
Keyword(s):  
System Design ◽  
Energy Efficient ◽  
State Of The Art ◽  
The State ◽  
Propulsion System ◽  
Component Technology ◽  
The Status

The NASA sponsored E3 Program, being conducted by Pratt & Witney Aircraft, is described, including program objectives and goals. The evolution of the Flight Propulsion System design and the related work of the aircraft manufacturers is discussed. The status of the component technology substantiation program is summarized.

Computational Fluid Dynamics and Numerical Acoustic Response for Ship Accommodation Areas due to Propeller Excitation, towards a Human Factors Recommendations

2014 ◽  
Vol 707 ◽  
pp. 406-411
Author(s):  
Hany Abdelkhalek ◽  
Duan Feng Han ◽  
Liang Tian Gao ◽  
Qing Wang
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Low Frequency ◽  
Propulsion System ◽  
Frequency Noise ◽  
Acoustic Comfort ◽  
Exciting Forces ◽  
Unsteady Simulation ◽  
Computational Fluid Dynamics Cfd ◽  
Acoustic Responses

In order to achieve the acoustic comfort design for ship accommodation areas, This paper introduces the noise prediction of ship’s superstructure cabins based on boundary element method (BEM). The study investigates the ship acoustic responses due to fluctuating forces induced as a result of interaction between a 4-bladed propeller and Bulk Carrier ship 35,000DWT at full scale. The mathematical models for the ship and the propeller have been built and validated using computational fluid dynamics (CFD), then unsteady simulation done to obtain the transient responses of the propeller excitations. Finally, the acoustic responses of ship super structure under propeller excitations are predicted using BEM in time domain. This work shows a numerical method enable to measure the structural and acoustic responses of the ship at propeller rotating speeds. In addition, at the structural resonating modes of the propeller and the ship. As the propulsion system is the main source of the ship exciting forces thereby nowadays prediction of the ship low frequency noise due to propulsion system becomes important to naval designer for designing a comfort accommodation areas for the crew onboard the ship.

Analysis of Gas Freeing of Oil Tankers Using CFD

2005 ◽  
Author(s):  
Kevin Chow ◽  
Arne E. Holdo̸ ◽  
Robert J. Croft
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
The State ◽  
Flow Interactions ◽  
Computational Fluid Dynamics Cfd ◽  
Oil Tankers ◽  
Physical Phenomena

Current gas-freeing processes on board Very Large Crude Carriers (VLCCs, ships ranging from 160,000 to 320,000 dwt) typically take 2–8 hours depending on the state of the tank. Legislation and practices covering the operations do not account or advise for the varying configurations of the tank leading to potentially inefficient de-gassing of the tank. Through the use of computational fluid dynamics (CFD), it has become possible to examine and analyse the important physical phenomena that governs the de-gassing processes inside the tank. The work presented utilises CFD to visualise the flow interactions of the injected air and the fluid inside the tank in combination with the tank structure. Using these modern techniques, existing gas-freeing methods can be examined with a view to highlighting poor mixing areas. A number if various tank configurations are examined, with respect to size, geometry, vent and fan arrangements. The results are analysed and presented with recommendations.

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