scholarly journals Dynamic relaxation processes in compressible multiphase flows. Application to evaporation phenomena

2013 ◽  
Vol 40 ◽  
pp. 103-123 ◽  
Author(s):  
O. Le Métayer ◽  
J. Massoni ◽  
R. Saurel
Keyword(s):  
Multiphase Flows ◽  
Relaxation Processes ◽  
Dynamic Relaxation

scholarly journals Neural network modeling of the rheology of the AlMg6 alloy under the dispersoid barrier effect and the inhibition of dynamic relaxation processes

2020 ◽  
pp. 10-26
Author(s):  
A. S. Smirnov ◽  
◽  
A. V. Konovalov ◽  
V. S. Kanakin ◽  
◽  
...  
Keyword(s):  
Neural Network ◽  
Strain Rate ◽  
Strain Rate Range ◽  
Neural Network Modeling ◽  
Relaxation Processes ◽  
Dynamic Relaxation ◽  
Rate Range ◽  
The Neural Network ◽  
Hidden Layer ◽  
Temperature Strain

The paper deals with a neural network to model the flow stress of the AlMg6 alloy at temperatures ranging between 300 and 500 C and strain rates from 1 to 25 s−1. In this temperature–strain-rate range, the movement of free dislocations is blocked and dynamic relaxation processes are inhibited. The results of training the neural network and its verification at a temperature not used in the training show that neural networks with a single hidden layer can correctly approximate and predict the rheological behavior of the AlMg6 alloy for the studied temperature–strain-rate range of deformation.

Reducing congestion on complex networks by dynamic relaxation processes

2007 ◽  
Vol 386 (2) ◽  
pp. 776-779 ◽  
Author(s):  
Pablo A. Macri ◽  
Ana L. Pastore y Piontti ◽  
Lidia A. Braunstein
Keyword(s):  
Complex Networks ◽  
Relaxation Processes ◽  
Dynamic Relaxation

Simulations of Compressible Multiphase Flows Through a Tube of Varying Cross-Section

2012 ◽  
Author(s):  
Shaban A. Jolgam ◽  
Ahmed R. Ballil ◽  
Andrzej F. Nowakowski ◽  
Franck C. G. A. Nicolleau
Keyword(s):  
Boundary Conditions ◽  
Numerical Algorithm ◽  
Multiphase Flows ◽  
Incompressible Flows ◽  
Godunov Method ◽  
Relaxation Processes ◽  
Source Terms ◽  
Governing Equations ◽  
Pressure Relaxation ◽  
Strang Splitting

The simulation of multiphase compressible flows through high pressure nozzles is presented. The study uses the developed numerical approach. There are many important engineering applications which are concerned with multiphase flows and convergent-divergent nozzles. This work presents the developed extension of the model and numerical algorithm based on the so called parent model earlier introduced by Saurel and Abgrall [Saurel, R. and Abgrall, R., A Multiphase Godunov Method for Compressible Multifluid and Multiphase Flows, J. Comput. Phys. 150 (1999), 425–467]. This model which consists of conservation laws for each phase complemented with the volume fraction evolution equation is modified by adding a source term to simulate area variation. The model is strictly hyperbolic and non-conservative due to the existence of non-conservative terms. The model is able to deal with compressible and incompressible flows. Moreover, it can deal with mixtures and pure fluids, where each fluid has its own pressure and velocity. The presence of velocity and pressure relaxation terms in the governing equations has made the velocity and pressure relaxation processes essential to tackle the boundary conditions at the interface. The interface separating phases is considered as a numerical diffusion zone in this method. The model is solved using an efficient Eulerian numerical method. A second order Godunov-type scheme with approximate Riemann solver is used to enable capturing of a physical interface by the resolution of the Riemann problem. The solution is obtained by splitting the hyperbolic part and source terms parts in the numerical algorithm. The source terms, including relaxation parts of the model, are tackled in succession using Strang splitting technique. The governing equations are solved at each computational cell using the same numerical algorithm for the whole domain including the interface. The main aim of this work has been to study different flow regimes with respect to pressure boundary conditions through the numerical solutions of single and multiphase flows. The performance of the programme has been verified via well established benchmark test problems for multiphase flows.

ANALYSIS OF MULTIPHASE FLOWS

1994 ◽  
Vol 8 (1-4) ◽  
pp. 207-255
Author(s):  
J. E. Flaherty
Keyword(s):  
Multiphase Flows

Activation energy of relaxation processes in chalcogenide glasses

2013 ◽  
Vol 34 (0) ◽  
pp. 59-63
Author(s):  
А. А. Горват ◽  
В. М. Кришеник ◽  
А. Е. Кріштофорій ◽  
В. В. Мінькович ◽  
О. А. Молнар
Keyword(s):  
Activation Energy ◽  
Chalcogenide Glasses ◽  
Relaxation Processes
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