scholarly journals One-dimensional simulation of radiation transport in three-dimensional cylinder

2013 ◽  
Vol 62 (1) ◽  
pp. 015210
Author(s):  
Song Tian-Ming ◽  
Yang Jia-Min
Keyword(s):  
Radiation Transport ◽  
Three Dimensional ◽  
One Dimensional ◽  
Dimensional Simulation

Numerical Investigation of the Thermal Behavior in a Hydrogen Tank During Fast Filling Process

2011 ◽  
Author(s):  
Youhei Takagi ◽  
Naoya Sugie ◽  
Kazuhiro Takeda ◽  
Yasunori Okano ◽  
Tooru Eguchi ◽  
...  
Keyword(s):  
Thermal Behavior ◽  
Dimensional Analysis ◽  
Three Dimensional ◽  
Hydrogen Gas ◽  
Tank Wall ◽  
Filling Process ◽  
Adiabatic Wall ◽  
Buoyant Force ◽  
One Dimensional ◽  
Dimensional Simulation

To investigate the thermal behavior during fast hydrogen filling process, the simple one-dimensional analysis considering the heat conduction in tank wall and the three-dimensional numerical simulation dealing with inner gas region were carried out. The numerical analyses were subject to the fast filling test of 35 MPa hydrogen gas into 34 litter tank for 80 seconds. The one-dimensional analysis predicted the temperature rise and the heat loss into surrounding air qualitatively and the averaged temperature of tank wall was underestimated. On the other hand, the three-dimensional simulation overestimated the temperature distribution because of using adiabatic wall condition. However, the effects of buoyant force and convective flow on local thermal profile were fully explained from our numerical results.

scholarly journals Study of one-dimensional cure simulation applicable conditions for thick laminates and its comparison with three-dimensional simulation

2018 ◽  
Vol 25 (6) ◽  
pp. 1197-1204 ◽  
Author(s):  
Mingfa Ren ◽  
Qi Wang ◽  
Jie Cong ◽  
Xin Chang
Keyword(s):  
Computational Cost ◽  
Three Dimensional ◽  
Cure Kinetics ◽  
Transient Heat Conduction ◽  
Material System ◽  
Element Analysis ◽  
One Dimensional ◽  
Dimensional Simulation ◽  
The One ◽  
Three Dimensional Finite Element

AbstractThe comparison of one- and three-dimensional cure simulation of thick thermoset matrix laminates was conducted in this study. The applicable conditions of one-dimensional cure simulation were investigated. The transient heat conduction equation coupled to the cure kinetics was solved numerically using one- and three-dimensional finite element analysis. The evolution of temperature and degree of cure of the laminates during the curing process obtained by the simulation agreed well with the published experimental results. The results indicate that a wider one-dimensional analysis applicable region around the center point will be obtained in the laminate with a higher span-to-thickness ratio and in a less anisotropic material system. In the applicable region, the accuracy of the one-dimensional cure simulation can satisfy the engineering request and save the computational cost. While beyond the region, there is a steep increase in deviation of the one- and three-dimensional simulation results.

Numerical Project for the Undergraduate Heat Transfer Course

2017 ◽  
Author(s):  
Dani Fadda
Keyword(s):  
Heat Transfer ◽  
Solid Body ◽  
Three Dimensional ◽  
Engineering Curriculum ◽  
One Dimensional ◽  
Conduction Heat Transfer ◽  
Heat Transfer Simulation ◽  
The Difference ◽  
Dimensional Simulation ◽  
Classroom Time

A numerical simulation project, described in this paper, was assigned in an undergraduate heat transfer course in the mechanical engineering curriculum. This project complemented the heat transfer lecture course and its corresponding heat transfer lab. It was used to help students visualize and better understand the difference between conduction heat transfer which occurs within a three-dimensional solid body and the convection and/or radiation which occur at the surface of the solid body. It also allowed the students to generate and compare results of one dimensional heat transfer calculations to three dimensional simulation results. The project contained well defined deliverables and an open-ended deliverable which allowed students to be creative. It gave the students reason to discuss the course outside the classroom. It allowed students to use SolidWorks heat transfer simulation and manage a MATLAB script without taking classroom time. It was appreciated and enjoyed by the students.

scholarly journals EMITTANCE LIMITATION OF A CONDITIONED BEAM IN A STRONG FOCUSING FEL UNDULATOR

2007 ◽  
Vol 22 (22) ◽  
pp. 3826-3837 ◽  
Author(s):  
Z. HUANG ◽  
G. STUPAKOV ◽  
S. REICHE
Keyword(s):  
Electron Beam ◽  
Free Electron ◽  
Free Electron Laser ◽  
Three Dimensional ◽  
Complete Elimination ◽  
Dimensional Model ◽  
Simulation Code ◽  
One Dimensional ◽  
Strong Focusing ◽  
Dimensional Simulation

Various methods have been proposed to condition an electron beam in order to reduce its emittance effect and to improve the short-wavelength free electron laser (FEL) performance. In this paper, we show that beam conditioning does not result in a complete elimination of the emittance effect in an alternating-gradient focusing FEL undulator. Using a one-dimensional model and a three-dimensional simulation code, we derive a criteria for the emittance limitation of a perfectly conditioned beam that depends on the focusing structure.

Development of a zero-dimensional turbulence model for a spark ignition engine

2018 ◽  
Vol 20 (4) ◽  
pp. 441-451 ◽  
Author(s):  
Namho Kim ◽  
Insuk Ko ◽  
Kyoungdoug Min
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Kinetic Energy ◽  
Three Dimensional ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Length Scale ◽  
One Dimensional ◽  
Simulation Results ◽  
Dimensional Simulation

The necessity for the use of one-dimensional simulation is growing because cost and time required for hardware optimization and optimal calibration of engines based on experiment are increasing dramatically as engines are equipped with growing numbers of technologies. For one-dimensional simulation results to be more reliable, the accuracy and applicability of the combustion model of a one-dimensional simulation tool must be guaranteed. Because the combustion process in a spark ignition engine is driven by the turbulence, many of existing models focus on the prediction of mean turbulence intensity. Although many successes in the previous models can be found, the previous models contain a large number of adjustable constants or require information supplemented from three-dimensional computational fluid dynamics simulation results. For improved applicability of a model, the number of adjustable constants and inputs to the model must be kept as small as possible. Thus, in this study, a new zero-dimensional (0D) turbulence model was proposed that requires information on the basic characteristics of the engine geometry and has only one adjustable constant. The model was developed based on the energy cascade model with additional consideration of following aspects: loss of kinetic energy during the intake stroke, the effect of piston motion during the compression and the expansion stroke, modifications to correlations for integral length scale, geometric length scale, and production rate of turbulent kinetic energy. An adjustable constant to consider engine design which determines tumble strength was also introduced. The comparison of the simulation results with those of three-dimensional computational fluid dynamics confirmed that the developed model can predict the mean turbulence intensity without case-dependent adjustment of the model constant.

Simulation of Grain Coarsening Using One-Dimensional Cellular Automaton

2013 ◽  
Vol 752 ◽  
pp. 217-222 ◽  
Author(s):  
Szilvia Gyöngyösi ◽  
Peter Barkoczy
Keyword(s):  
Cellular Automaton ◽  
Short Range ◽  
Three Dimensional ◽  
Recrystallization Process ◽  
Grain Coarsening ◽  
One Dimensional ◽  
Measurement Results ◽  
Dimension 2 ◽  
Dimensional Simulation ◽  
Effective Use

Numerous literature [1,4,5] has reported on the effective use of cellular automaton method for the simulation of short-range diffusion. Using this model for the simulation of short-range diffusional phase transformations therefore is a resolved issue. It is proven that two- or three-dimensional automata can reflect the course of the abovementioned processes realistically. What our study demonstrates more than in the past [1] is that two-dimensional stochastic cellular automaton simulation already presented before has been simplified. This time our automaton operates in one dimension [2], which has consequently reduced running time, thus, made it possible to enhance the efficiency of the scaling of simulation. In our previous work the results of scaling of one-dimensional simulation of the recrystallization process [3] were demonstrated, in our current study fitting is performed for measurement results of grain coarsening using one-dimensional cellular automaton.

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