Experimental study on dynamic buckling phenomena for supercavitating underwater vehicle

Chung, Min-Ho; Lee, Hee Jun; Kang, Yeon-Cheol; Lim, Woo-Bin; Kim, Jeong-Ho; Cho, Jin Yeon; Byun, Wan-Il; Kim, Seung-Jo; Park, Sung-Han

doi:10.3744/jnaoe.2012.4.3.183

Cited by 2 publications

(1 citation statement)

References 13 publications

(17 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1–3 The shape of this structure is usually spherical at the end, 4,5 and the middle part is approximately cylindrical. However, in practical applications, the submersible usually works in a deep-water environment, 6–9 which causes all subsea structures to be under great hydrostatic pressure. 10,11 Furthermore, enormous security risks are made when collision events of underwater equipment occur.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the dynamic behavior of the ring-stiffened double-shell structure due to subsea collisions

Wang,

Zhang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

The ring-stiffened double-shell structure is currently widely utilized in the equipment for ocean engineering, of which the response analysis under subsea impact is important to accomplish the safety and highly difficult Marine missions. However, due to the complex characteristics of the research object including fluid-solid coupling contact, large deformation, short response time, and multiplet structure, the dynamic behavior of the impacted ring-stiffened double-shell structure is hard to analyze accurately by traditional numerical methods. To overcome challenges, a fresh modeling and solving approach for the impacting mechanism of the structure body is put forward by this paper. The method is based on the Arbitrary Lagrange-Euler and Fluid-Structure-Interaction (ALE-FSI) theory. A stiffness matrix of a penalty function and steady outer pressure setting is presented to build the underwater interaction model. Then, the ALE-based description method is proposed to simulate the collision process. The results indicate that the adopted modeling and solving methods for the subsea structural collision have better revealed the dynamic response process of subsea structure to impact. There isn’t any evident damage spreading to the surrounding region, and the structural damage is primarily contained in the collision area. When an underwater impact is applied to the double shell structure, the non-pressure shell provides better protection. The core academic achievement of this work is providing an effective approach for subsea impacting mechanism and nonlinear dynamic response of ring-stiffened double-shell structure which can be used in different scenarios. It can offer universal references to optimize the construction of underwater equipment and determine the level of impact damage to submarines.

show abstract

Section: Introductionmentioning

confidence: 99%

Investigation on the dynamic behavior of the ring-stiffened double-shell structure due to subsea collisions

Wang,

Zhang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

show abstract

Numerical Analysis of Supercavitating Flows of Two-Dimensional Simple Bodies

Lee¹,

Choi²,

Kim³

2013

Journal of the Society of Naval Architects of Korea

View full text Add to dashboard Cite

1This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License(http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.In this paper, a numerical analysis is carried out to study the characteristics of supercavitating flows and the drag of relatively simple two-dimensional and axisymmetric bodies which can be used for supercavity generation device, cavitator, of a high-speed underwater vehicle. In order to investigate the suitability of numerical models, cavity flows around the hemispherical head form and two-dimensional wedge are calculated with combinations of three turbulence models(standard   , realizable   , Reynolds stress) and two cavitation models(Schnerr-Sauer, Zwart-Gerber-Belamri). From the results, it is confirmed that the calculated cavity flow is more affected by the turbulence model than the cavitation model. For the calculation of steady state cavity flows, the convergence in case of the realizable    model is better than the other turbulence models. The numerical result of the Schnerr-Sauer cavitation model is changed less by turbulence model and more robust than the Zwart-Gerber-Belamri model. Thus the realizable    turbulence model and the Schnerr-Sauer cavitation model are applied to calculate supercavitating flows around disks, two dimensional 10° and 30°wedges. In case of the disk, the cavitation number dependences of the cavity size and the drag coefficient predicted are similar to either experimental data or Reichardt's semi-empirical equations, but the drag coefficient is overestimated about 3% higher than the Reichardt's equation. In case of the wedges, the cavitation number dependences of the cavity size are similar to experimental data and Newman's linear theory, and the agreement of the cavity length predicted and Newman's linear theory becomes better as decreasing cavitation number. However, the drag coefficients of wedges agree more with experimental data than those of Newman's analytic solution. The cavitation number dependences of the drag coefficients of both the disk and the wedge appear linear and simple formula for estimating the drag of supercavitating disks and wedges are suggested. Consequently, the CFD scheme of this study can be applied for numerical analysis of supercavitating flows of the cavitator and the cavitator design.

show abstract

Experimental study on dynamic buckling phenomena for supercavitating underwater vehicle

Cited by 2 publications

References 13 publications

Investigation on the dynamic behavior of the ring-stiffened double-shell structure due to subsea collisions

Investigation on the dynamic behavior of the ring-stiffened double-shell structure due to subsea collisions

Numerical Analysis of Supercavitating Flows of Two-Dimensional Simple Bodies

Contact Info

Product

Resources

About