super cavity
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Plasmonics ◽  
2019 ◽  
Vol 15 (1) ◽  
pp. 11-19 ◽  
Author(s):  
Zhengqi Liu ◽  
Guiqiang Liu ◽  
Xiaoshan Liu ◽  
Mulin Liu ◽  
Xuefeng Zhan ◽  
...  

Author(s):  
Miro Erkintalo ◽  
Miles Anderson ◽  
Yadong Wang ◽  
Francois Leo ◽  
Stephane Coen ◽  
...  
Keyword(s):  

2018 ◽  
Vol 40 (1) ◽  
pp. 1-13
Author(s):  
Tran Thu Ha ◽  
Nguyen Duc Thuyen ◽  
Nguyen Thai Dung ◽  
Duong Ngoc Hai

Author(s):  
Jinkang Lim ◽  
Anatoliy A. Savchenkov ◽  
Andrey B. Matsko ◽  
Shu-Wei Huang ◽  
Lute Maleki ◽  
...  

2016 ◽  
Vol 38 (4) ◽  
pp. 267-278
Author(s):  
Tran Thu Ha ◽  
Nguyen Anh Son ◽  
Duong Ngoc Hai

When a slender body moves very fast through water at sufficient speed the cavity phenomena is happened. In a cavity model the body’s lengths and cavitator diameter are determined by the differential variationoptimal method so that the velocity of body is maximum.


2016 ◽  
Vol 54 (3) ◽  
pp. 426
Author(s):  
Tran Thu Ha ◽  
Nguyen Anh Son ◽  
Duong Ngoc Hai ◽  
Nguyen Hong Phong

On the imperfect water entry, a high speed slender body moving in the forward direction rotates inside the cavity. The super cavity model describes the very fast motion of body in water. In the super cavity model the drag coefficient plays important role in body's motion. In some references this drag coefficient is simply chosen by different values in the interval 0.8-1.0. In some other references this drag coefficient is written by the formula  with  is the cavity number,   is the angle of body axis and flow direction,  is a parameter chosen from the interval 0.6-0.85. In this paper the drag coefficient  is written with fixed  and the parameter is corrected so that the simulation body velocities are closer to observation data. To find the convenient drag coefficient the data assimilation method by differential variation is applied. In this method the observing data is used in the cost function. The data assimilation is one of the effected methods to solve the optimal problems by solving the adjoin problems and then finding the gradient of cost function. 


Author(s):  
Jinkang Lim ◽  
Shu-Wei Huang ◽  
Abhinav K. Vinod ◽  
Anatoliy A. Savchenkov ◽  
Andrey B. Matsko ◽  
...  
Keyword(s):  

Author(s):  
Haruki Daido ◽  
Satoshi Watanabe ◽  
Shin-ichi Tsuda

In the present study, the effects of dissolved gas content on the unsteady cavitating flow around a Clark Y-11.7% hydrofoil are investigated in a cavitation tunnel. Lift and drag forces in various cavitating conditions are directly measured by strain gauges attached on the cantilever supporting the hydrofoil. In addition, the cavitating flow is filmed from the top and the side simultaneously using two high speed video cameras. The high (roughly 6–8ppm) and low (1–2ppm) DO conditions are examined to obtain the qualitative tendencies of the effects of dissolved gas on unsteady cavitation behavior and lift/drag characteristics. It is found that that the relationship between the cavitation behavior and the lift/drag fluctuations does not qualitatively differ in the two different DO conditions, while the amplitude is slightly larger in the low DO condition. At transitional cavity oscillation, in the both DO conditions, the lift/drag coefficients increase during the growth stage of sheet/bubble cavities on the hydrofoil and they decrease when the developed super-cavity disappears. Moreover, it seems that the amplitude of the lift/drag forces in the low DO condition is larger than in the high DO condition but the frequency of lift force fluctuation is not very different.


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