scholarly journals Nuclear rocket shielding methods, modification, updating, and input data preparation. Volume V. Two-dimensional, discrete ordinates transport technique

1970 ◽  
Author(s):  
R.G. Soltesz ◽  
R.K. Disney ◽  
J. Jedruch ◽  
S.L. Zeigler
Keyword(s):  
Input Data ◽  
Discrete Ordinates ◽  
Two Dimensional ◽  
Data Preparation ◽  
Nuclear Rocket ◽  
Shielding Methods ◽  
Transport Technique

Numerical Modeling of Radiative and Reactive Flow Field Around a Blunt Body at Hypersonic Regimes

2010 ◽  
Author(s):  
Morteza Rahmanpour ◽  
Reza Ebrahimi ◽  
Mehrzad Shams
Keyword(s):  
Flow Field ◽  
Differential Equations ◽  
Heat Fluxes ◽  
Transitional Flow ◽  
Navier Stokes ◽  
Implicit Time ◽  
Discrete Ordinates ◽  
Two Dimensional ◽  
Fully Implicit ◽  
Time Marching

A numerical method for calculation of strong radiation for two-dimensional reactive air flow field is developed. The governing equations are taken to be two dimensional, compressible Reynolds-average Navier-Stokes and species transport equations. Also, radiation heat flux in energy equation is evaluated using a model of discrete ordinate method. The model used S4 approximation to reduce the governing system of integro-differential equations to coupled set of partial differential equations. A multiband model is used to construct absorption coefficients. Tangent slab approximation is assumed to determine the characteristic parameters needed in the Discrete Ordinates Method. The turbulent diffusion and heat fluxes are modeled by Baldwin and Lomax method. The flow solution is obtained with a fully implicit time marching method. A thermochemical nonequilibrium formulation appropriate to hypersonic transitional flow of air is presented. The method is compared with existing experimental results and good agreement is observed.

Effects of uncertain topographic input data on two-dimensional flow modeling in a gravel-bed river

2011 ◽  
Vol 47 (3) ◽  
Author(s):  
Carl J. Legleiter ◽  
Phaedon C. Kyriakidis ◽  
Richard R. McDonald ◽  
Jonathan M. Nelson
Keyword(s):  
Input Data ◽  
Two Dimensional ◽  
Flow Modeling ◽  
Gravel Bed ◽  
Dimensional Flow ◽  
Two Dimensional Flow ◽  
Gravel Bed River

Study of Flow-Induced Vibrations of a Plate in Narrow Channels

1967 ◽  
Vol 89 (4) ◽  
pp. 824-830 ◽  
Author(s):  
S. R. Bland ◽  
R. H. Rhyne ◽  
H. B. Pierce
Keyword(s):  
Rocket Engine ◽  
Strong Dependence ◽  
Narrow Channel ◽  
Two Dimensional ◽  
Rigid Plate ◽  
Narrow Channels ◽  
The Core ◽  
Flow Induced Vibrations ◽  
Nuclear Rocket ◽  
Time Of Failure

Vibration phenomena associated with narrow channel flow have come under study as a result of the core failure of an early nuclear rocket engine. Since the mechanism of this vibration instability was not well understood at the time of failure, an investigation of a simple system consisting of a rigid plate with two degrees of spring-restrained freedom in a two-dimensional channel has been made both experimentally and analytically. The results show a strong dependence of the flow rate required for plate oscillation on the channel width (normal to plate).

Comparison of three discrete ordinates methods applied to two-dimensional curved geometries

2003 ◽  
Vol 42 (4) ◽  
pp. 343-359 ◽  
Author(s):  
Hong-Mo Koo ◽  
Rodolphe Vaillon ◽  
Vincent Goutière ◽  
Vital Le Dez ◽  
Hojin Cha ◽  
...  
Keyword(s):  
Discrete Ordinates ◽  
Two Dimensional

Two-Dimensional Discrete Ordinates Photon Transport Calculations for Brachytherapy Dosimetry Applications

2000 ◽  
Vol 134 (2) ◽  
pp. 121-134 ◽  
Author(s):  
George M. Daskalov ◽  
Randal S. Baker ◽  
Robert C. Little ◽  
David W. O. Rogers ◽  
Jeffrey F. Williamson
Keyword(s):  
Discrete Ordinates ◽  
Two Dimensional ◽  
Photon Transport
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