discrete ordinates
Recently Published Documents


TOTAL DOCUMENTS

843
(FIVE YEARS 112)

H-INDEX

51
(FIVE YEARS 4)

2022 ◽  
pp. 563-616
Author(s):  
Michael F. Modest ◽  
Sandip Mazumder
Keyword(s):  

2021 ◽  
Vol 164 ◽  
pp. 108570
Author(s):  
Huaiqian Yi ◽  
Paolo Vinai ◽  
Christophe Demazière

Author(s):  
Amaury Munoz Oliva ◽  
Hermes Alves Filho

In this work, we present the most recent numerical results in a nodal approach, which resulted in the development of a new numerical spectral nodal method, based on the spectral analysis of the multigroup, isotropic scattering neutron transport equations in the discrete ordinates ($S_N$) formulation for fixed-source calculations in non-multiplying media (shielding problems). The numerical results refer to simulations of typical problems from the reactor physics field, in rectangular two-dimensional Cartesian geometry, $X, Y$ geometry, and are compared with the traditional Diamond Difference ($DD$) fine-mesh method results, used as a reference, and the spectral coarse-mesh method Green's function ($SGF$) results.


Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6939
Author(s):  
Jinsheng Lv ◽  
Junrui Shi ◽  
Mingming Mao ◽  
Fang He

Pore-scale studies of premixed gas combustion in a packed bed is conducted to study the flow and thermal non-equilibrium phenomenon in packed bed. The 3D random packed bed is generated using the EDEM software and solid surface radiation is computed using Discrete Ordinates (DO) model. The simulations are carried out using a commercial software package based on the finite volume method. It is shown that the local variation of species mass fraction, reaction rate et al. in pores near the flame front is significant, the radiation heat flux is transferred layer-by-layer. Cold flow simulation without reaction reveals that flow non-equilibrium is one of the essential characteristics of packing bed and increase in flow velocity leads to intensify non-equilibrium phenomenon. The distributions for content of axial velocity and gas temperature are wave-like shape in the burner and vary with time.


Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6839
Author(s):  
Yong Cheng ◽  
Shuihua Yang ◽  
Zhifeng Huang

The improved discrete ordinates method (IDOM) developed in our previous paper is extended to solve radiative transfer in three-dimensional radiative systems with anisotropic scattering medium. In IDOM, radiative intensities in a large number of new discrete directions are calculated by direct integration of the conventional discrete ordinates method (DOM) results, and radiative heat flux is obtained by integrating radiative intensities in these new discrete directions. Ray effects and false scattering, which tend to compensate each other, are investigated together in IDOM. Results show that IDOM can mitigate both of them effectively with high computation efficiency. Finally, the effect of scattering phase function on radiative transfer is studied. Results of radiative heat flux at boundaries containing media with different scattering phase functions are compared and analyzed. This paper indicates that the IDOM can overcome the shortages of the conventional DOM well while inheriting its advantages such as high computation efficiency and easy implementation.


Sign in / Sign up

Export Citation Format

Share Document