scholarly journals Multi-dimensional Simulation of Phase Change by a 0D-2D Model Coupling via Stefan Condition

2021 ◽  
Author(s):  
Adrien Drouillet ◽  
Romain Le Tellier ◽  
Raphaël Loubère ◽  
Mathieu Peybernes ◽  
Louis Viot
Keyword(s):  
Phase Change ◽  
Model Coupling ◽  
Dimensional Simulation ◽  
Stefan Condition ◽  
2D Model

1D and 2D model coupling approach for the development of operational spatial flood early warning system

2021 ◽  
pp. 1-16
Author(s):  
Sindhu Kalimisetty ◽  
Amanpreet Singh ◽  
Durga Rao Korada Hari Venkata ◽  
Venkateshwar Rao V ◽  
Vazeer Mahammood
Keyword(s):  
Early Warning ◽  
Early Warning System ◽  
Warning System ◽  
Model Coupling ◽  
Coupling Approach ◽  
2D Model

scholarly journals Some hydrodynamic problems for flood forecasting and flood control in the Red river system

2007 ◽  
Vol 29 (3) ◽  
pp. 271-283
Author(s):  
Nguyen Van Diep
Keyword(s):  
Flood Control ◽  
River System ◽  
Flood Forecasting ◽  
Hydraulic Model ◽  
Red River ◽  
Model Coupling ◽  
Development Activity ◽  
Dam Break Flow ◽  
Scientific Results ◽  
2D Model

My research & development activity in the field of environmental & natural fluid mechanics has been started after one year's working visit, proposed by Prof. Nguyen Van Dao, at the Laboratoire National d'Hydraulique de France in Chatou, France (1979-1980). Until now this activity is still a most important one.In the paper it is presented some selected scientific results in one of hydrodynamic problems for flood forecasting and flood control: developing of the 1D hydraulic model, 1D & quasi 2D model, 1D hydraulic model for dam break flow , 2D hydraulic model, coupling of 1D and 2D hydraulic models and some theirs applications for flood forecasting and flood control in the Red River System.This paper is dedicated to the memory of Prof. Nguyen Van Dao, with whom I had a big chance to work and to collaborate during about 30 years, to whom I would like to express my heartfelt thanks.

Three-Dimensional Simulation of Proposed Ring-Confined-Chalcogenide Phase-Change Memory for Reducing Reset Operation Current

2016 ◽  
Vol 698 ◽  
pp. 149-153
Author(s):  
You Yin ◽  
Sumio Hosaka
Keyword(s):  
Phase Change ◽  
Phase Change Memory ◽  
Three Dimensional ◽  
3 Dimensional ◽  
Temperature Distributions ◽  
Reset Operation ◽  
Dimensional Finite Element ◽  
Higher Temperature ◽  
Dimensional Simulation ◽  
Change Memory

In this paper, we proposed a phase-change memory (PCM) structure which has a ring confined chalcogenide (RCC) for reducing reset operation current. The temperature distributions of normal bottom contact (NBC), confined chalcogenide (CC) and proposed RCC PCMs were simulated by 3 dimensional finite element method. It was very clear that a much higher temperature can be obtained for RCC than NBC cell at a certain programming current. The programming characteristics also exhibited that the operation current of RCC cell can be as low as about 45% of NBC cell while that of CC cell was about 82% of CC cell.

scholarly journals Calculation of Phase-Change Boundary Position in Continuous Casting

2013 ◽  
Vol 13 (4) ◽  
pp. 57-62 ◽  
Author(s):  
A.A. Ivanova
Keyword(s):  
Phase Change ◽  
Solid Phase ◽  
Nonlinear Partial Differential Equations ◽  
Heat Transfer Process ◽  
Method Of Calculation ◽  
Boundary Position ◽  
System Equations ◽  
Stefan Condition ◽  
Non Linear System ◽  
The Mathematical Model

Abstract The problem of determination of the phase-change boundary position at the mathematical modeling of continuous ingot temperature field is considered. The description of the heat transfer process takes into account the dependence of the thermal physical characteristics on the temperature, so that the mathematical model is based on the nonlinear partial differential equations. The boundary position between liquid and solid phase is given by the temperatures equality condition and the Stefan condition for the two-dimensional case. The new method of calculation of the phase-change boundary position is proposed. This method based on the finite-differences with using explicit schemes and on the iteration method of solving of non-linear system equations. The proposed method of calculation is many times faster than the real time. So that it amenable to be used for model predictive control of continuous semifinished product solidification.

Simulation-Based Comparison of Cell Design Concepts for Phase Change Random Access Memory

2007 ◽  
Vol 7 (1) ◽  
pp. 298-305 ◽  
Author(s):  
Dae-Hwang Kim ◽  
Florian Merget ◽  
Michael Först ◽  
Heinrich Kurz
Keyword(s):  
Phase Change ◽  
Three Dimensional ◽  
Random Access ◽  
Random Access Memory ◽  
Access Memory ◽  
Design Concepts ◽  
Reset Operation ◽  
Critical Issues ◽  
Dimensional Simulation ◽  
Lateral Cell

The RESET operation of different design concepts for phase change random access memory (PCRAM) cell is studied and compared using a three dimensional simulation model. This numerical algorithm comprises four interacting sub-models, which describe the electrical, thermal, phase change, and percolation dynamics in the PCRAM devices during the switching operation. The so-called vertical, confined, and lateral cell geometries are evaluated in terms of their current requirements for RESET operations, which is one of the most critical issues for an achievement of high integration densities. The advantages of the confined and lateral cell architecture as compared to the conventional vertical cell concept are explored, demonstrating their benefits of advanced thermal management and minimized current defined area. The simulation results agree well with experimental features of the RESET operation for the PCRAM design concepts studied.

The effect of an aluminum heat-sink layer on the laser-induced amorphization of SiOx/TeGeSn/SiOx phase-change recording films

1989 ◽  
Vol 47 ◽  
pp. 574-575
Author(s):  
Matthew R. Libera ◽  
Martin Chen
Keyword(s):  
Thin Film ◽  
Phase Change ◽  
Heat Sink ◽  
Multilayer Film ◽  
Glassy Phase ◽  
Film Structure ◽  
Glass Forming ◽  
Active Storage ◽  
Dielectric Layers ◽  
Amorphous States

Phase-change erasable optical storage is based on the ability to switch a micron-sized region of a thin film between the crystalline and amorphous states using a diffraction-limited laser as a heat source. A bit of information can be represented as an amorphous spot on a crystalline background, and the two states can be optically identified by their different reflectivities. In a typical multilayer thin-film structure the active (storage) layer is sandwiched between one or more dielectric layers. The dielectric layers provide physical containment and act as a heat sink. A viable phase-change medium must be able to quench to the glassy phase after melting, and this requires proper tailoring of the thermal properties of the multilayer film. The present research studies one particular multilayer structure and shows the effect of an additional aluminum layer on the glass-forming ability.

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