scholarly journals Outage Capacity of Two-Phase Space-Time Coded Cooperative Multicasting

2006 ◽  
Author(s):  
Aitor del Coso ◽  
Osvaldo Simeone ◽  
Yeheskel Bar-ness ◽  
Christian Ibars
Keyword(s):  
Phase Space ◽  
Space Time ◽  
Outage Capacity ◽  
Two Phase

The space–time CE/SE method for solving single and two-phase shallow flow models

2014 ◽  
Vol 96 ◽  
pp. 136-151 ◽  
Author(s):  
Shamsul Qamar ◽  
Saqib Zia ◽  
Waqas Ashraf
Keyword(s):  
Space Time ◽  
Shallow Flow ◽  
Two Phase ◽  
Flow Models

The phase space time evolution method

1971 ◽  
Vol 1 (2) ◽  
pp. 115-143
Author(s):  
Morton A. Tavel ◽  
Martin S. Zucker
Keyword(s):  
Phase Space ◽  
Time Evolution ◽  
Space Time ◽  
Space Time Evolution

scholarly journals Axisymmetric two‐phase flow simulations on space‐time meshes

PAMM ◽  
2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Violeta Karyofylli ◽  
Liubov Kamaldinova ◽  
Marek Simon ◽  
Oleg Mokrov ◽  
Uwe Reisgen ◽  
...  
Keyword(s):  
Two Phase Flow ◽  
Space Time ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Simulations

scholarly journals Numerical Simulation of Liquid-Fueled Detonations by an Eulerian–Lagrangian Model

2012 ◽  
Vol 13 (2) ◽  
Author(s):  
Hua Shen ◽  
Gang Wang ◽  
Kaixin Liu ◽  
Deliang Zhang
Keyword(s):  
Numerical Simulation ◽  
Flow Model ◽  
Two Phase Flow ◽  
Gaseous Mixture ◽  
Space Time ◽  
Lagrangian Method ◽  
Lagrangian Model ◽  
Phase Flow ◽  
Two Phase ◽  
Eulerian Method

AbstractIn this paper, an Eulerian–Lagrangian two-phase flow model for liquid-fueled detonations is constructed. The gaseous mixture is described by an Eulerian method, and liquid particles in gaseous mixture are traced by a Lagrangian method. An improved space-time conservation element and solution element (CE/SE) scheme is applied to the simulations of detonations in liquid C

COSMIC DEFECT COSMOLOGY

2009 ◽  
Vol 24 (08n09) ◽  
pp. 1620-1624
Author(s):  
A. TARTAGLIA
Keyword(s):  
Phase Space ◽  
Cold Dark Matter ◽  
Displacement Vector ◽  
Empty Space ◽  
Space Time ◽  
Point Particle ◽  
Accelerated Expansion ◽  
Displacement Vector Field ◽  
Type Ia ◽  
Ia Supernovae

The accelerated expansion of the universe is interpreted as an effect of a defect in space-time treated as a four-dimensional continuum endowed with physical properties. The analogy is with texture defects in material continua, like dislocations and disclinations, described in terms of a singular displacement vector field. A Lagrangian for empty space-time is proposed exploiting one further analogy between the phase space of a Robertson-Walker universe and the phase space of a point particle moving across an homogeneous isotropic medium. The model, named Cosmic Defect theory, produces, as a byproduct, also inflation near the initial singularity. The theory has been applied to fit the luminosity data of 192 type Ia supernovae. The results are satisfying and comparable with the ones obtained by means of the Λ Cold Dark Matter standard model.

Physical aspects of the relaxation model in two-phase flow

1990 ◽  
Vol 428 (1875) ◽  
pp. 379-397 ◽  
Keyword(s):  
Phase Space ◽  
Singular Point ◽  
Shock Waves ◽  
Saddle Points ◽  
Singular Points ◽  
Relaxation Model ◽  
Two Phase ◽  
Point Patterns ◽  
All Solutions ◽  
Topological Pattern

The paper explores the potential of the homogeneous relaxation model (HRM) as a basis for the description of adiabatic, one-dimensional, two-phase flows. To this end, a rigorous mathematical analysis highlights the similarities and differences between this and the homogeneous equilibrium model (HEM) emphasizing the physical and qualitative aspects of the problem. Special attention is placed on a study of dispersion, characteristics, choking and shock waves. The most essential features are discovered with reference to the appropriate and convenient phase space Ω for HRM, which consists of pressure P , enthalpy h , dryness fraction x , velocity w , and length coordinate z . The geometric properties of the phase space Ω enable us to sketch the topological pattern of all solutions of the model. The study of choking is intimately connected with the occurrence of singular points of the set of simultaneous first-order differential equations of the model. The very powerful centre manifold theorem allows us to reduce the study of singular points to a two-dimensional plane Π , which is tangent to the solutions at a singular point, and so to demonstrate that only three singular-point patterns can appear (excepting degenerate cases), namely saddle points, nodal points and spiral points. The analysis reveals the existence of two limiting velocities of wave propagation, the frozen velocity a f and the equilibrium velocity a e . The critical velocity of choking is the frozen speed of sound. The analysis proves unequivocally that transition from ω < a f to w > a f can take place only via a singular point. Such a condition can also be attained at the end of a channel. The paper concludes with a short discussion of normal, fully dispersed and partly dispersed shock waves.

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