On a modified differential approximation method in radiative gas dynamics

Meccanica ◽  
1982 ◽  
Vol 17 (3) ◽  
pp. 149-151
Author(s):  
Epifanio Virga
Keyword(s):  
Approximation Method ◽  
Gas Dynamics ◽  
Differential Approximation ◽  
Differential Approximation Method

scholarly journals ANALYSIS OF UPWIND AND HIGH‐RESOLUTION SCHEMES FOR SOLVING CONVECTION DOMINATED PROBLEMS IN POROUS MEDIA

2006 ◽  
Vol 11 (4) ◽  
pp. 451-474 ◽  
Author(s):  
V. Starikovičius ◽  
R. Čiegis
Keyword(s):  
Porous Media ◽  
High Resolution ◽  
Hyperbolic Equations ◽  
Test Problems ◽  
Differential Approximation ◽  
Upwind Schemes ◽  
High Resolution Schemes ◽  
Differential Approximation Method ◽  
Parallel Arrays ◽  
Convection Dominated

The conservation laws governing the multiphase flows in porous media are often convection‐dominated and have a steep fronts that require accurate resolution. Standard discretization methods of the convection terms do not perform well for such problems. The main aim of this work is to analyze the use of upwind and high‐ resolution schemes in such cases. First, we use a first differential approximation method to perform a theoretical analysis of a standard upwind approximation and different time stepping schemes for the linear hyperbolic equations in 1‐ and 2D. Next, we present a popular approach to reduce the amount of numerical diffusion introduced by upwind approximation ‐ high‐resolution schemes. We compare our implementation of one of the recently proposed central‐upwind schemes against the upwind schemes on several test problems based on Buckley‐Leverett equation and discuss the results. Finally, a parallel version of central‐upwind scheme in 2D is presented. It was implemented using our C++ library of parallel arrays ‐ ParSol.

Supernovae and interstellar gas dynamics

1967 ◽  
Vol 31 ◽  
pp. 117-119
Author(s):  
F. D. Kahn ◽  
L. Woltjer
Keyword(s):  
Lower Limit ◽  
High Velocity ◽  
Gas Dynamics ◽  
Interstellar Cloud ◽  
Interstellar Gas ◽  
Random Motions ◽  
Relativistic Particles

The efficiency of the transfer of energy from supernovae into interstellar cloud motions is investigated. A lower limit of about 0·002 is obtained, but values near 0·01 are more likely. Taking all uncertainties in the theory and observations into account, the energy per supernova, in the form of relativistic particles or high-velocity matter, needed to maintain the random motions in the interstellar gas is estimated as 1051·4±1ergs.

Using the Combination of GM(1,1) and Taylor Approximation Method to Predict the Academic Achievement of Student

2014 ◽  
Vol 1 (2) ◽  
pp. 55-69 ◽  
Author(s):  
Phuoc-Hai Nguyen ◽  
◽  
Tian-Wei Sheu ◽  
Phung-Tuyen Nguyen ◽  
Duc-Hieu Pham ◽  
...  
Keyword(s):  
Academic Achievement ◽  
Approximation Method ◽  
Taylor Approximation
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