The Basic Research on Numerical Simulation of Bimetal Composited T-Tube through Hydraulic Bulging

2013 ◽  
Vol 278-280 ◽  
pp. 487-490 ◽  
Author(s):  
Hui Feng Wang ◽  
Jing Tao Han ◽  
Zhang Hui
Keyword(s):  
Numerical Simulation ◽  
Frictional Force ◽  
Basic Research ◽  
Loading Path ◽  
Metal Tube ◽  
T Tube ◽  
Loading Method ◽  
Clad Tube ◽  
Bimetal Tubes ◽  
Hydraulic Bulging

Bimetal composited tube is constituted by two different metals. Comparing with single metal tube, composited tube can make the best of optimum performance of based tube and clad tube. In present research, straight bimetal tubes were taken as the objectives and have been studied deeply. A new hydroform process is introduced in this paper, which can be used to form bimetal composited special tubes. Loading path, loading method, deformation of material, influence of frictional force etc. are studied using numerical simulation fully and the key technique and specialty of this technology were gained. Through simple equipment bimetal composited T-tube has been prepared.

Synchronized Hydraulic Bulging Forming Technology of Three-Layer-Metal Tubes

2010 ◽  
Vol 143-144 ◽  
pp. 1059-1064
Author(s):  
Wei Wei Wang ◽  
Jian Li Song ◽  
Jing Bo Yu ◽  
B.B. Jia
Keyword(s):  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Theoretical Analysis ◽  
Main Process ◽  
Forming Process ◽  
Element Analysis ◽  
Forming Technology ◽  
Comparison Of The Results ◽  
Hydraulic Bulging ◽  
The Relationship

Synchronized hydraulic bulging forming technology on three-layer-metal tubes was studied. The possibility of three-layer-metal tubes formed by hydraulic bulging method was discussed and proved by elastic-plastic theory. The calculation formulas about the bulging pressure, the residual contact stress and the relationship between them were derived and the main process parameters were analyzed. Finite element analysis was carried out on bulging forming process using MSC. Marc. Practical bulging forming experiments were conducted and well compounded three-layer-metal tubes with tight interfaces were obtained. Through the comparison of the results of theoretical analysis, numerical simulation and practical experiments, proper parameters for the bulging process were obtained and the theoretical analysis was verified and proved.

Tsunami Observer: automatic system for estimate of tsunamigenicity of an earthquake

2020 ◽  
Author(s):  
Viacheslav Karpov ◽  
Sergey Kolesov ◽  
Mikhail Nosov ◽  
Anna Bolshakova ◽  
Gulnaz Nurislamova ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Automatic System ◽  
Basic Research ◽  
Water Layer ◽  
Tsunami Source ◽  
Tsunami Waves ◽  
Surface Time ◽  
Bottom Deformation ◽  
Fault Parameters ◽  
Initial Elevation

<p>In this talk the fully automatic system for estimate of tsunamigenicity of an earthquake is presented. The system is focused on simplicity and speed with usage of minimum of input data. The input dataset for the system includes (1) earthquake coordinates, (2) earthquake depth, (3) seismic moment, (4) focal mechanism. We use datasets provided by USGS and GEOFON. Upon receiving earthquake data the system performs the following consecutive actions. At first, the vector field of co-seismic bottom deformation is obtained using earthquake fault parameters and empirical relationships. Then the initial elevation in tsunami source is calculated and estimation of Soloviev-Imamura tsunami intensity is performed. Initial elevation is calculated taking into account vertical and horizontal components of bottom deformation, local bathymetry (GEBCO) and smoothing effect of water layer. An auxiliary study was conducted to obtain relationship between potential energy of initial elevation of water in tsunami source and intensity of resulting tsunami. More than 200 historical events from HTDB/WLD and NGDC/WDS databases was statistically processed. The obtained relationship is used to assess the intensity of tsunami generated by earthquake under consideration. Finally, if event is considered significant (energy > 10<sup>9</sup> J), the numerical simulation of propagation of tsunami waves is performed. As a result of numerical simulation, animations of wave propagation, distribution of maximum tsunami heights, and water surface time-histories in a number of given points are produced. Details of implementation, physical constraints, future development of system as well as 2-years experience of the system operation will be discussed during the talk.</p><p><strong>Acknowledgements</strong></p><p>This work was supported by the Russian Foundation for Basic Research, projects 20-07-01098, 20-35-70038, 19-05-00351.</p>

Analysis of Swage Autofrettage in Metal Tube

2006 ◽  
Author(s):  
Muhammad Afzaal Malik ◽  
Muddasar Khan ◽  
Badar Rashid ◽  
Shahab Khushnood
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Research Work ◽  
Applied Pressure ◽  
Pressure Vessels ◽  
Design Parameters ◽  
Metal Tube ◽  
Fatigue Lifetime ◽  
Second Stage ◽  
Simulation Based

Autofrettage (self-hooping) is used to induce advantageous residual stresses into pressure vessels to enhance their fatigue lifetime. The process is achieved by increasing elastic strength of a cylinder with various methods such as hydraulic pressurization, mechanical swaging, or by utilizing the pressure of a powder gas. This research work deals with the swage or mechanical autofrettage of metal tubes. The objective is to attain a bore size of 125mm. Normally such a bore size is achieved with hydraulic autofrettage. However, we have used two-stage mechanical autofrettage to achieve the desired bore size. At first stage the swage diameter achieved is 118mm, and in the second stage, the diameter achieved after machining is 125mm. The temperature variation for swage is 38°C to 50°C. The applied pressure varies from 85 to 180 bars inside the tube. The process was applied to a number of tubes selected randomly. The swage autofrettage process was also analyzed using numerical simulation based on finite element method. The results of numerical simulation are compared with design parameters.

Numerical Simulation of Two-Dimensional Turbulent in T-Tube Tee about Two Kinds of Angle

2010 ◽  
Vol 160-162 ◽  
pp. 301-306 ◽  
Author(s):  
Mo You Xiong ◽  
Zhong Hua Tang
Keyword(s):  
Numerical Simulation ◽  
Flow Characteristics ◽  
Internal Flow ◽  
Two Dimensional ◽  
Local Resistance ◽  
Air Conditioning System ◽  
T Tube ◽  
Central Air Conditioning ◽  
The Common ◽  
Calculation Software

Due to T-tube tee is used mostly to connect ducts of the central air conditioning system, different angles of branch pipes caused different local resistance changes. This paper studied two-dimensional turbulent numerical simulation about inter flow of two kinds T-tube by numerical calculation software (CFD),in the method of implicit separation and standard k- ε two equations model, it is clear known that two kinds of forms tee fitting Angle of the internal flow field, Through the contrastive analysis of flow characteristics, it is obvious that local resistance of the oblique angled T-tube tee is much smaller than the common T-tube tee, and also is much more homogeneous.

scholarly journals Preliminary Basic Research on the Optimization of Oil Spill Prevention and Control Design Based on Numerical Simulation Technology for Zhoushan Ma’ao Port Area

2021 ◽  
Author(s):  
Junyan Dong ◽  
Zhibo Tang ◽  
Hanbao Chen
Keyword(s):  
Numerical Simulation ◽  
Oil Spill ◽  
Prevention And Control ◽  
Control Design ◽  
Basic Research ◽  
Port Area ◽  
And Control ◽  
The Relationship ◽  
Control Designs ◽  
Related Process

This paper gives a general overview of relevant studies about oil spill emergency control designs, analyzes and discusses the structure, function and main contents of these designs. Besides, the paper proposes an integrated and practical design of emergency response steps, with related process. Taking the port area of Ma’ao as a case, this paper comprehensively studies the relationship between the time of rescue vessels arriving at the oil spill location and the range of the port that can be covered by these vessels as well as the protection facilities required for the relevant shoreline.

scholarly journals NUMERICAL SIMULATION OF WEAK TURBULENCE OF ELECTROCAPILLARY WAVES ON THE SURFACE OF A LIQUID DIELECTRIC

2019 ◽  
Vol 47 (1) ◽  
pp. 55-57
Author(s):  
N.M. Zubarev ◽  
E.A. Kochurin
Keyword(s):  
Numerical Simulation ◽  
Electric Field ◽  
Strong Electric Field ◽  
Basic Research ◽  
Capillary Waves ◽  
Liquid Dielectric ◽  
Russian Academy Of Sciences ◽  
Direct Energy ◽  
The Russian Federation ◽  
Academy Of Sciences

In the present work, direct numerical simulation of the interaction of plane capillary waves on the surface of a liquid dielectric in an external tangential electric field with allowance for viscosity forces has been carried out. In the limit of a strong electric field, when viscous and capillary forces can be neglected, at which the curvature of the boundary increases significantly singular points can form at the boundary of the liquid (Zubarev, Kochurin, 2014, Kochurin, 2018, Kochurin, Zubarev, 2018). In the case of a finite electric field, the interaction of opposing nonlinear electrocapillary waves can lead to the appearance of a direct energy cascade. In the quasi-stationary energy dissipation regime, the probability density functions for the angles of the boundary inclination tend to the normal Gaussian distribution, and the shape of the boundary takes on a complex, chaotic form. The spectrum of the surface disturbances in this mode is described by a power dependence of k–5/2. In terms of energy, the resulting spectrum has the form k–3/2, which coincides with the Iroshnikov-Kraichnan energy spectrum and indicates that the observed wave turbulence of the liquid surface and weak magnetohydrodynamic turbulence of interacting Alfven waves have a related nature. The work was carried out within the framework of the theme of state assignment 0389-2015-0023 with the support of the Russian Foundation for Basic Research, projects No. 16-38-60002, 19-08-00098, 17-08-00430), the Presidiums of the Russian Academy of Sciences and the Ural Branch of the Russian Academy of Sciences (projects No. 2 and 18-2-2 -15, respectively) and the Council on grants of the President of the Russian Federation (project SP-132.2016.1).

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