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Cavitation nozzle is the core component of cavitation generator. It promotes cavitation by its internal special structure, producing bubble and improving the impact force of jet. The structural characteristics directly affect the quality of the cavitation jet. Therefore, the study of internal structure of nozzle is helpful to improve the performance of nozzle. Based on CFD software, taking the Helmholtz...
A numerical simulation was performed using a vortex method in order to investigate the fluid mechanical interferences of two tandem airfoils at variable angles of attack. Based on the shape of a vessel or a submarine, the mutual distance between the two airfoils (distance ratio) and the range of angle of attack were chosen. A symmetrical airfoil NACA0012 was used and the Reynolds number was Re = 3...
Collision phenomena of drifting ship caused by tsunami are one of the major challenges on design of coastal structure. Here, FEMA[1] is recommended a calculation formula of collision force which is validated by the water tank experiment. And it is indicated its availability. However, the FEMA's formula has not considered about collision phenomena of huge ships. Then, the objective of the present study...
Investigation of the motion of deformable particles immersed in fluid is clinically very relevant because it can help to improve treatment planning, diagnostics of disease, design of efficient terapeutical procedures, analysis of drug transport, etc. Experimental investigation of these phenomena is difficult and expensive and, therefore, numerical simulations can contribute to the acquisition of a...
The isolation plugging tool is normally developed for deep water pipeline repairing. It is a mechanical structure of plugging and sealing fluid in high-pressure pipelines to make sure the pipe maintenance operation under normal transmission. In order to design control the plugging tool, the analysis of underlying flow field physics in pipeline is necessary based on the in-situ situation. The flow...
The deformation and motion behaviors of droplets under electric field are important research tasks regarding the mechanisms of emulsion electric dehydration. In order to study the dehydration characteristics of droplets under a non-uniform electric field, the simulation model of droplets under a non-uniform electric field was established using the phase field method, based on Cahn-Hilliard formulation...
The dam-break problem is important in the design and management of hydraulic engineering. In order to study the spread of dam-break flow on complicated terrain, three-dimensional numerical simulations of the dam-break flow were carried out using VOF in this paper. The results are agreement with experimental data. The complex flow characteristics flood wave propagation process of three-dimensional...
This research conducted a quantificational research on the radial velocity of fluid in Hydrocyclone based on the contrastive study of laser testing and numerical simulation combined technology. The hydrocyclone radial velocity approximate formula is put forward through the quantificational contrastive analysis for both fluid radial velocity and flux at different planes in Hydrocyclone. From comparison,...
To investigate the tail-slap loads on supercavitating projectiles, a simple model for cavity-fluid region is presented based on Logvinovich's Principle. And a series of simulations of fluid - structure interaction (FSI) were done to determine the effects of the slenderness ratio of projectiles on the tail-slap loads. The results show that the impact duration increases as the slenderness ratio increases...
The high pressure water jet nozzle is a key part to accelerating abrasive particles. The geometrical model of fluid control volume in front and back nozzle and physical model of particle were established by object oriented fluid flow flied and particle of submerged jet. The results showed that the outlet average velocity of fluid and particle falls down sharply with the particle concentration increasing...
This paper describes an investigation in Capillary and Fishbone valves as controlling medium of liquid flow for micro-devices and diagnosis methods like Enzymed Linked Immonusorbent Assays (ELISA). Numerical simulation by MATLAB programming was employed to predict the pressure gradient at the Capillary valve expansion part and Fishbone valve section. The analysis results of pressure gradient versus...
As the thrust of wastewater treatment mixer is a blank in current research in domestic, hydrodynamic analysis on the blade of the wastewater treatment mixer was used in this paper based on lifting theory of fluid mechanics, and the calculation formula of hydraulic thrust was deduced and demonstrated, which is significant in theory and valuable in practice. After analysis, the hydraulic thrust of wastewater...
The erecting process of a hydraulic erecting system was studied based on electro-hydraulic similarity principle, with the numerical simulation of the rapid-erection system of a multi-function missile launching vehicle as an example. The system modeling was based on ??knot point balance method??. The pressure-flow rate characteristics of hydraulic elements and cubage cavity were analyzed based on mathematic...
Linear Cubic-Law for seepage is derived in single straight smooth fracture. For most natural fractures rock mass in engineering are coarse, so the seepage in them doesn't abide by linear Cubic-Law, and the Cubic law for them need modify to use. The numerical simulation for fractures aperture was done according to statistical distribution regularity, and the fracture was divided into several length-equaling...
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