Search citation statements
Paper Sections
Citation Types
Year Published
Publication Types
Relationship
Authors
Journals
Air-Layer Drag Reduction (ALDR) technology for ship energy saving is getting more and more attention in recent years because of the outstanding drag reduction effect. In order to promote practical application, it is necessary to fully understand air layer two phase flow characteristics. Recent experimental studies have shown that the surface of the air layer presents wave pattern, which has an important influence on its damage risk. However, it is difficult to measure the wave pattern quantificationally due to the interference of equipment. Therefore, the main goal of the present paper is to investigate the wave pattern characteristic of air layer in cavity using numerical simulation method. On the basis, the effect of flow and geometric influence factors are discussed to understand the key control conditions. A CFD numerical method based on RANS equations and VOF interface capturing method is established, and has been successfully applied on the simulation of air layer wave pattern. Both two-dimensional and threedimensional simulations are carried out, aiming at analyzing air-water interface flow and vortex flow directly. Based on the simulation results, it is found to be an inherent characteristic that the wave height of the upstream air layer is higher than that of the downstream, which causes that the first wave peak becomes the most important failure position of the air layer. The reason is analyzed from the view of vortex field in this paper. As the most important flow parameters, the influences of water flow velocity and air volume flow rate on the wave height and length have been discussed in detail. In terms of the geometric parameters, the cavity configuration, depth and width are found to exert great effects on the wave pattern while the position and size of air injector have little effect. Based on the analysis of this paper, it is believed that these geometric configurations affect the air layer by affecting the local vortex flow fields. The results of this study can help improve the understanding of air layer flow and provide reference for ship air cavity design.
Air-Layer Drag Reduction (ALDR) technology for ship energy saving is getting more and more attention in recent years because of the outstanding drag reduction effect. In order to promote practical application, it is necessary to fully understand air layer two phase flow characteristics. Recent experimental studies have shown that the surface of the air layer presents wave pattern, which has an important influence on its damage risk. However, it is difficult to measure the wave pattern quantificationally due to the interference of equipment. Therefore, the main goal of the present paper is to investigate the wave pattern characteristic of air layer in cavity using numerical simulation method. On the basis, the effect of flow and geometric influence factors are discussed to understand the key control conditions. A CFD numerical method based on RANS equations and VOF interface capturing method is established, and has been successfully applied on the simulation of air layer wave pattern. Both two-dimensional and threedimensional simulations are carried out, aiming at analyzing air-water interface flow and vortex flow directly. Based on the simulation results, it is found to be an inherent characteristic that the wave height of the upstream air layer is higher than that of the downstream, which causes that the first wave peak becomes the most important failure position of the air layer. The reason is analyzed from the view of vortex field in this paper. As the most important flow parameters, the influences of water flow velocity and air volume flow rate on the wave height and length have been discussed in detail. In terms of the geometric parameters, the cavity configuration, depth and width are found to exert great effects on the wave pattern while the position and size of air injector have little effect. Based on the analysis of this paper, it is believed that these geometric configurations affect the air layer by affecting the local vortex flow fields. The results of this study can help improve the understanding of air layer flow and provide reference for ship air cavity design.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.