Numerical Analysis of the Body, Webbed-Feet, and Wings During Cormorant's Take Off

2018 ◽  
Author(s):  
Jinguo Huang ◽  
Jianhong Liang ◽  
Tianmiao Wang ◽  
Hongyu Chen ◽  
Jiayu Li ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
The Body

Development of Venturi-Tube With Spiral-Shaped Fin for Water Treatment

2019 ◽  
Vol 141 (5) ◽  
Author(s):  
Dong Ho Shin ◽  
Yeonghyeon Gim ◽  
Dong Kee Sohn ◽  
Han Seo Ko
Keyword(s):  
Water Treatment ◽  
Numerical Analysis ◽  
Kinetic Energy ◽  
Turbulent Kinetic Energy ◽  
Volume Fraction ◽  
Volume Flow Rate ◽  
Numerical Data ◽  
The Body ◽  
Venturi Tube ◽  
Type Water

Detailed numerical data were presented for the development of a venturi-type water purifier which had a cavitation nozzle to enhance turbulent kinetic energy and vapor volume fraction. Numerical analysis for cavitation was conducted in multiphase flow using the software, cfx. The numerical method used in this study was verified by the experimental data of pressure distribution in tube and the observation of cavitation from previous studies. From the result of the numerical analysis, a logarithmic relation between the vapor volume fraction and volume flow rate of water according to the area ratio between the throat and the entrance of a venturi-tube was derived. In addition, spiral-shaped fins were developed to enhance the turbulent kinetic energy in the body of a venturi-tube. Thus, it was confirmed that the volume fraction and turbulent kinetic energy of the developed water purifier were enhanced compared with the normal venturi-tube without the spiral-shaped fin. Finally, the improved water treatment performance of the advanced design of the venturi-tube was confirmed by the removal test of the representative solutions.

scholarly journals Numerical Analysis of Aerodynamic Characteristics of a of High-Speed Car With Movable Bodywork Elements

2015 ◽  
Vol 62 (4) ◽  
pp. 451-476 ◽  
Author(s):  
Tomasz Janson ◽  
Janusz Piechna
Keyword(s):  
Numerical Analysis ◽  
High Speed ◽  
Transient Flow ◽  
Aerodynamic Drag ◽  
Position Angle ◽  
Aerodynamic Characteristics ◽  
The Body ◽  
Ansys Fluent ◽  
Drag Forces ◽  
And Performance

Abstract This paper presents the results of numerical analysis of aerodynamic characteristics of a sports car equipped with movable aerodynamic elements. The effects of size, shape, position, angle of inclination of the moving flaps on the aerodynamic downforce and aerodynamic drag forces acting on the vehicle were investigated. The calculations were performed with the help of the ANSYS-Fluent CFD software. The transient flow of incompressible fluid around the car body with moving flaps, with modeled turbulence (model Spalart-Allmaras or SAS), was simulated. The paper presents examples of effective flap configuration, and the example of configuration which does not generate aerodynamic downforce. One compares the change in the forces generated at different angles of flap opening, pressure distribution, and visualization of streamlines around the body. There are shown the physical reasons for the observed abnormal characteristics of some flap configurations. The results of calculations are presented in the form of pressure contours, pathlines, and force changes in the function of the angle of flap rotation. There is also presented estimated practical suitability of particular flap configurations for controlling the high-speed car stability and performance.

scholarly journals Extraction of RDS(ON)of n-Channel Power MOSFET by Numerical Simulation Model

2001 ◽  
Vol 23 (4) ◽  
pp. 175-183 ◽  
Author(s):  
C. -T. Salame
Keyword(s):  
Numerical Simulation ◽  
Numerical Analysis ◽  
Operation Mode ◽  
Electrical Measurement ◽  
Original Method ◽  
The Body ◽  
Positive Bias ◽  
Electrical Characteristics ◽  
Channel Power ◽  
Power Mosfet

In this paper we present an original method for n-channel power MOSFET resistance extraction in the operation mode (RDS(ON)). The IDS=f(VDS) electrical characteristics measurements for the transistor and the Body-Drain junction are realized for the experimental determination and the extraction (by numerical analysis) of RDS(ON), respectively. Values of this resistance are extracted for different positive bias applied between the gate and the source (+VGS). Physicals parameters obtained from the numerical analysis are inspected, and results shows that the numerically analysed junction characteristic is in very good correlation with the electrical measurement

scholarly journals Numerical analysis of spinal stabiliser in spondylolisthesis treatment with pedicle screws

2019 ◽  
Vol 252 ◽  
pp. 08006
Author(s):  
Jarosław Zubrzycki
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Analysis ◽  
3D Model ◽  
Static Load ◽  
Pedicle Screws ◽  
The Body ◽  
The Other ◽  
The Finite Element Method ◽  
Load Analysis

The aim of the research on experimental parts was to analyse the influence of the lumbar stabilisation on the strength aspects of the lumbar part of human spine and stabiliser in case of spondylolisthesis treatment. The models were built with the use of pre-surgical CT diagnostics, routinely used in medical practice. MIMICS software was used to process the results of the neuroimaging research and to create a 3D model. Two models were built: one with and the other without a stabilizer. Afterwards, a static load analysis for the load coming from the upper part of the body was done. Analysis was performed using the finite element method (FEA). The performed simulations enabled to determine the stress in particular discs for both models, with and without transpedicular stabiliser.

scholarly journals Experimental and Numerical Analysis of the Gas Flow in the Axisymmetric Radial Clearance

Energies ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5794
Author(s):  
Damian Joachimiak ◽  
Andrzej Frąckowiak
Keyword(s):  
Numerical Analysis ◽  
Experimental Research ◽  
Gas Flow ◽  
Pressure Ratio ◽  
The Body ◽  
Flow Coefficient ◽  
Radial Clearance ◽  
Seal Integrity ◽  
Venant Equation ◽  
Wide Range

This paper focuses on the analysis of the gas flow in the axisymmetric mini gap bounded by the surface of the top of the labyrinth seal tooth and the surface of the body. It includes the results of experimental research and numerical calculations. Experimental research focused on the analysis of gas flow for six clearance heights in a wide range of pressure drops. Based on this research, we determined the mass flow in the clearance. Using the Saint-Venant equation, we determined the flow coefficient versus the pressure ratio upstream and downstream from the seal. Flow coefficients for various clearance heights obtained from the experiment can be divided into two data groups, the values of which differ significantly. To explain changes in the value of the gas flow coefficient for selected clearance heights, numerical analysis of the said gas flow was performed using the Fluent software. This analysis allowed us to explain the reason for the variability of the flow coefficient. This research can be the basis for determining the change of seal integrity during operation for staggered and stepped seals.

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