scholarly journals Fluid-Structure Interaction Mechanisms for Close-In Explosions

2000 ◽  
Vol 7 (5) ◽  
pp. 265-275 ◽  
Author(s):  
Andrew B. Wardlaw Jr. ◽  
J. Alan Luton
Keyword(s):  
Flow Field ◽  
Rigid Body ◽  
Shock Loading ◽  
Fluid Structure Interaction ◽  
Pressure Level ◽  
Fluid Structure ◽  
Underwater Explosions ◽  
Structure Interaction ◽  
Bubble Interaction ◽  
Initial Shock

This paper examines fluid-structure interaction for close-in internal and external underwater explosions. The resulting flow field is impacted by the interaction between the reflected explosion shock and the explosion bubble. This shock reflects off the bubble as an expansion that reduces the pressure level between the bubble and the target, inducing cavitation and its subsequent collapse that reloads the target. Computational examples of several close-in interaction cases are presented to document the occurrence of these mechanisms. By comparing deformable and rigid body simulations, it is shown that cavitation collapse can occur solely from the shock-bubble interaction without the benefit of target deformation. Addition of a deforming target lowers the flow field pressure, facilitates cavitation and cavitation collapse, as well as reducing the impulse of the initial shock loading.

scholarly journals The Research Of Fluid-structure Interaction Of The Hydrocyclone Under The Condition Of Vibration

2019 ◽  
Vol 118 ◽  
pp. 02075
Author(s):  
Xu Dekui
Keyword(s):  
Flow Field ◽  
Flow Characteristic ◽  
Fluid Structure Interaction ◽  
Tangential Velocity ◽  
Vibration Frequencies ◽  
Spatiotemporal Evolution ◽  
External Disturbances ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Structural Motion

During the operation of the hydrocyclone, vibrations are often generated by internal fluids and external disturbances resulting in fluid-structure interaction, causing the spatiotemporal evolution of the flow field and the movement of the structure. In this paper, the flow characteristic and the structural motion of the periodic vibrating hydrocyclones are studied. The bidirectional fluid-solid model of hydrocyclone under vibration condition is established. The flow field and structure motion under different vibration frequencies and structure resonances are studied. It shows that the velocities in the three directions oscillate positively and negatively with the motion of structure, the amplitude of the oscillation is the largest on resonance, the skewing of the velocity in the flow field is smaller than the structure; the tangential velocity is asymmetric and the radial velocity is increased significantly, the deformation of the structure is different on the different vibration frequencies, which causes the flow field of distribution of each section to be different. This study will provide the theoretical guidance for the application of hydrocyclone under the vibration conditions.

Numerical simulation of fluid-structure interaction in the opening process of conical parachute

2009 ◽  
Vol 113 (1141) ◽  
pp. 165-175
Author(s):  
Y. Cao ◽  
Z. Wu ◽  
Q. Song ◽  
J. Sheridan
Keyword(s):  
Flow Field ◽  
Deformation Process ◽  
Fluid Structure Interaction ◽  
Field Variation ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Parachute System ◽  
Computational Fluid Dynamics Cfd ◽  
Flexible Canopy ◽  
Opening Process

Abstract According to multi-node model, the dynamics equations of conical parachute system for simulating shape deformation process of the flexible canopy in the opening process were established. With the combination of dynamics equations code and computational fluid dynamics (CFD) software, the fluid-structure interaction investigation of the conical parachute was carried out. Also the change of parachute shape and flow field, inflation time, the rate of descent, the distance of descent, and other relevant data were achieved. This paper has focused on analysing vortex structure of the flow field in the opening process of conical parachute, and laid the foundation for studying mechanics mechanism of flow field variation of conical parachute in future.

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