Numerical Study of Propeller Slipstream Based on Unstructured Dynamic Overset Grids

2012 ◽  
Vol 49 (2) ◽  
pp. 384-389 ◽  
Author(s):  
He-yong Xu ◽  
Zheng-yin Ye ◽  
Ai-ming Shi
Keyword(s):  
Numerical Study ◽  
Overset Grids ◽  
Dynamic Overset Grids

Turn and zigzag maneuvers of a surface combatant using a URANS approach with dynamic overset grids

2012 ◽  
Vol 18 (2) ◽  
pp. 166-181 ◽  
Author(s):  
Pablo M. Carrica ◽  
Farzad Ismail ◽  
Mark Hyman ◽  
Shanti Bhushan ◽  
Frederick Stern
Keyword(s):  
Overset Grids ◽  
Dynamic Overset Grids ◽  
Surface Combatant

The Vortex and Wall Fluctuating Pressure Around Submarine Sail Based on DDES Method

2019 ◽  
Author(s):  
Rui Luo ◽  
Yue Sun ◽  
Hang Zhang ◽  
Jin Zhan ◽  
Xiao Cai
Keyword(s):  
Vortex Structure ◽  
Numerical Study ◽  
Three Dimensional ◽  
Overset Grids ◽  
Fluctuating Pressure ◽  
Trailing Vortices ◽  
Simulation Results ◽  
Noise Vibration ◽  
Vortex Tubes

Abstract Vortex around ships is easy to cause noise, vibration and fatigue of propellers. In addition, the complexity and variability of vortex will also have a greater impact on sensors and detection equipment installed on the surface of the vehicle. It is necessary to carry out corresponding research. In this paper, the fluctuating pressure was numerically analyzed using improved DDES model. And applying overset grids to better capture vortices around submarine sail. The numerical study of a three-dimensional unsteady vortex structure was performed for calculation. There were two vortex tubes and some broken small vortices behind the sail. The simulation results showed that trailing vortices behind sail slightly swept up and the distance between two vortex tubes became larger.

Numerical Investigation on Lock-In Condition and Convective Heat Transfer From an Elastically Supported Cylinder in a Cross Flow

2013 ◽  
Vol 135 (3) ◽  
Author(s):  
F. Baratchi ◽  
M. Saghafian ◽  
B. Baratchi
Keyword(s):  
Nusselt Number ◽  
Natural Frequencies ◽  
Numerical Study ◽  
Cross Flow ◽  
Elastic Cylinder ◽  
Overset Grids ◽  
Wide Range ◽  
Flow Induced Vibrations ◽  
Lock In ◽  
Elastically Supported

In this numerical study, flow-induced vibrations of a heated elastically supported cylinder in a laminar flow with Re = 200 and Pr = 0.7 are simulated using the moving overset grids method. This work is carried out for a wide range of natural frequencies of the cylinder, while for all cases mass ratio and reduced damping coefficient, respectively, are set to 1 and 0.01. Here we study lock-in condition and its effects on force coefficients, the amplitude of oscillations, vortex shedding pattern, and Nusselt number and simultaneously investigate the effect of in-line oscillations of the cylinder on these parameters. Results show that for this cylinder, soft lock-in occurs for a range of natural frequencies and parameters like Nusselt number, and the amplitude of oscillation reach their maximum values in this range. In addition, this study shows that in-line oscillations of the cylinder have an important effect on its dynamic and thermal behavior, and one-degree-of-freedom simulation, for an elastic cylinder, which can vibrate freely in a flow field, is only valid for cases far from soft lock-in range.

Investigation on the unstructured rotational dynamic overset grids

2015 ◽  
Vol 87 (4) ◽  
pp. 293-304 ◽  
Author(s):  
He-yong Xu ◽  
Shi-long Xing ◽  
Zheng-yin Ye
Keyword(s):  
Overset Grids ◽  
Rotational Dynamic ◽  
Dynamic Overset Grids

Ship motions using single-phase level set with dynamic overset grids

2007 ◽  
Vol 36 (9) ◽  
pp. 1415-1433 ◽  
Author(s):  
Pablo M. Carrica ◽  
Robert V. Wilson ◽  
Ralph W. Noack ◽  
Fred Stern
Keyword(s):  
Level Set ◽  
Single Phase ◽  
Ship Motions ◽  
Overset Grids ◽  
Dynamic Overset Grids

Dynamic overset grids in OpenFOAM with application to KCS self-propulsion and maneuvering

2015 ◽  
Vol 108 ◽  
pp. 287-306 ◽  
Author(s):  
Zhirong Shen ◽  
Decheng Wan ◽  
Pablo M. Carrica
Keyword(s):  
Overset Grids ◽  
Dynamic Overset Grids

Coaxial Rotor Helicopter in Hover Based on Unstructured Dynamic Overset Grids

2010 ◽  
Vol 47 (5) ◽  
pp. 1820-1824 ◽  
Author(s):  
He-Yong Xu ◽  
Zheng-Yin Ye
Keyword(s):  
Overset Grids ◽  
Coaxial Rotor ◽  
Dynamic Overset Grids
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