scholarly journals Cell‐based maximum entropy approximants for three‐dimensional domains: Application in large strain elastodynamics using the meshless total Lagrangian explicit dynamics method

2019 ◽  
Vol 121 (3) ◽  
pp. 477-491 ◽  
Author(s):  
Konstantinos A. Mountris ◽  
George C. Bourantas ◽  
Daniel Millán ◽  
Grand R. Joldes ◽  
Karol Miller ◽  
...  
Keyword(s):  
Maximum Entropy ◽  
Large Strain ◽  
Three Dimensional ◽  
Explicit Dynamics ◽  
Total Lagrangian Explicit Dynamics ◽  
Dynamics Method

Three-dimensional simulations of nanopowder compaction processes by granular dynamics method

2013 ◽  
Vol 88 (1) ◽  
Author(s):  
G. Sh. Boltachev ◽  
K. E. Lukyashin ◽  
V. A. Shitov ◽  
N. B. Volkov
Keyword(s):  
Three Dimensional ◽  
Granular Dynamics ◽  
Compaction Processes ◽  
Dynamics Method ◽  
Three Dimensional Simulations

Viscosity Prediction of Water-Based Silver Nanofluid Using Equilibrium Molecular Dynamics

2016 ◽  
Author(s):  
Qianli Ma ◽  
Haisheng Fang
Keyword(s):  
Molecular Dynamics ◽  
Volume Fraction ◽  
Three Dimensional ◽  
Weight Fraction ◽  
Nanoparticle Concentration ◽  
Nanoparticle Aggregation ◽  
Ink Jet ◽  
Jet Printing ◽  
Viscosity Prediction ◽  
Dynamics Method

Nanofluids containing silver (Ag) nanoparticles have been used in three dimensional ink-jet printing (3DP) in recent years. Rheological properties of the nanofluids, for example, viscosity, play significant roles during the application. In this paper, viscosity of Ag-water nanofluid has been predicted using the equilibrium molecular dynamics method. The influencing factors of the viscosity, including temperature, nanoparticle size, nanoparticle concentration and nanoparticle aggregation, have been investigated. By screening the existing water models, TIP4P/2005 model is found the most suitable for viscosity calculation under the temperature range. The weight fraction of the nanoparticles, which proves more appropriate, is used during the study of the concentration effect instead of volume fraction. The results show that the viscosity of the nanofluid goes up by decreasing temperature or increasing nanoparticle concentration. Furthermore, as the nanoparticles get smaller, or aggregate, the viscosity increases slightly.

Airflow Simulation of the Huge Telescope Assemble

2010 ◽  
Vol 439-440 ◽  
pp. 880-883
Author(s):  
Fu Zhao ◽  
Ping Wang ◽  
Yan Jue Gong ◽  
Yu De Liu ◽  
Hong Bin Xin
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Natural Convection ◽  
Temperature Distribution ◽  
Velocity Field ◽  
Three Dimensional ◽  
Horizontal Line ◽  
Air Velocity ◽  
Turbulent Airflow ◽  
Dynamics Method

With the three-dimensional computational fluid dynamics method, the airflow effects over the huge telescope assemble is investigated in this article. The distributing of velocity field and natural convection are studied by modeling and simulating the turbulent airflow of the huge telescope. Numerical simulations show the best observation direction is the 90o angle between the main optics axis and the horizontal line in which the air velocity distribution is the least. And the air temperature distribution and uniformity around the telescope are also provided by simulation.

Deep learning acceleration of Total Lagrangian Explicit Dynamics for soft tissue mechanics

2020 ◽  
Vol 358 ◽  
pp. 112628 ◽  
Author(s):  
Felix Meister ◽  
Tiziano Passerini ◽  
Viorel Mihalef ◽  
Ahmet Tuysuzoglu ◽  
Andreas Maier ◽  
...  
Keyword(s):  
Deep Learning ◽  
Soft Tissue ◽  
Tissue Mechanics ◽  
Soft Tissue Mechanics ◽  
Explicit Dynamics ◽  
Total Lagrangian Explicit Dynamics

Quantitative Image Processing in 3D

1998 ◽  
Vol 4 (S2) ◽  
pp. 442-443
Author(s):  
Ulf Skoglund
Keyword(s):  
Image Processing ◽  
Maximum Entropy ◽  
Three Dimensional ◽  
Small Radius ◽  
Noise Effects ◽  
High Frequencies ◽  
Quantitative Image ◽  
Dimensional Reconstruction ◽  
Electron Microscopes ◽  
Different Sources

Three-dimensional reconstructions from projections are usually ridden by noise from different sources. A common problem among many three-dimensional reconstruction techniques is the systematic absence of certain projections, but also the accidental absence of spurious projections. In these three-dimensional reconstructions such absences are visible as directional smearing due to convolution. Other convolution effects such as those due to the optics of the instrument used to record the data usually cause severe damping of high frequencies and even contrast reversal (common in images from electron microscopes).Several approaches to overcome these ‘noise’ effects in three-dimensional reconstructions have been developed, but they usually suffer from the very small radius of convergence. Very easily and commonly, the refinement iterations end up stuck in a premature choice of a minimum. We have developed another algorithm, constrained maximum entropy tomography (COMET), that in practice has been shown to overcome these problems.

Effect of Bend Angle on Plastic Limit Loads of Pipe Bends Under In-Plane Bending Moment

2016 ◽  
Author(s):  
Shunjie Li ◽  
Changyu Zhou ◽  
Jian Li ◽  
Xinting Miao
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Large Strain ◽  
Large Angle ◽  
Three Dimensional ◽  
Bending Moment ◽  
Limit Load ◽  
Bend Angle ◽  
Plastic Limit ◽  
Limit Loads

The effect of bend angle on plastic limit loads of pipe bends (elbows) under in-plane opening and closing bending moment is presented using three-dimensional large strain nonlinear finite element analyses. The results show that the presence of ovality significantly leads to the stress concentration in the middle cross section, which is the critical section of pipe bends. Meanwhile the state of stress concentration is also associated with the loading modes including the in-plane opening bending moment and the closing bending moment. Then plastic limit loads of pipe bends are further studied. It is found that plastic limit loads are decreasing with the increase of bend angles. Especially the variation of plastic limit loads of small angle pipe bends (bend angle from the 0 degree to 90 degree) is larger than that of large angle pipe bends (bend angle greater than 90 degree). Based on the finite element results, the present plastic limit load solutions are not fit for the large angle pipe bends (bend angle greater than 90 degree).

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