Fusion neutron streaming benchmark experiments and the analysis by the three-dimensional transport calculation code, tristan

1989 ◽  
Vol 10 ◽  
pp. 127-132 ◽  
Author(s):  
Y. Oka ◽  
K. Shin ◽  
T. Ida ◽  
S. Ohno ◽  
M. Yokozawa ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Fusion Neutron ◽  
Transport Calculation ◽  
Calculation Code

scholarly journals Coarse-Mesh Three-Dimensional Transport Calculation Method

1987 ◽  
Vol 24 (11) ◽  
pp. 960-964
Author(s):  
Hiroomi SAKUMA ◽  
Noboru ITO ◽  
Toshikazu TAKEDA
Keyword(s):  
Calculation Method ◽  
Three Dimensional ◽  
Coarse Mesh ◽  
Transport Calculation

Development and Application of a 2D/1D Fusion Code With Leakage Reconstruction Method

2018 ◽  
Author(s):  
Liang Liang ◽  
Zhouyu Liu ◽  
Hongchun Wu ◽  
Sheng Wang ◽  
Qian Zhang ◽  
...  
Keyword(s):  
Difference Method ◽  
Three Dimensional ◽  
Axial Direction ◽  
Reconstruction Method ◽  
Fusion Method ◽  
Reactor Physics ◽  
Leakage Term ◽  
Calculation Domain ◽  
Transport Calculation ◽  
Transport Method

The 2D/1D fusion method (2D/1D method) is becoming a popular transport method for whole-core calculations, which reduces the group condense and assembly homogenization approximations in the conventional two-step reactor physics calculations. In most 2D/1D codes, a pin is chosen as a 1D calculation domain, which assumes that the axial leakage of the pin is flat on top/bottom surfaces. Similar to the axial leakage, the radial leakage of every 2D plane also introduces several approximations along axial direction for the 1D calculation. In this paper a 2D/1D fusion code is developed, while a leakage reconstruction method is proposed and applied. In this 2D/1D fusion code, MOC is applied to the radial 2D calculation and the Sn diamond difference method is used for the axial 1D calculation. Numerical results indicate that the 2D/1D fusion code developed in this paper is precise in three-dimensional transport calculation and show the performance of this leakage reconstruction method especially when the leakage term is significant.

scholarly journals Three-dimensional numerical simulation of a turbulent flow around an obstacle

2020 ◽  
Vol 307 ◽  
pp. 01006
Author(s):  
Benahmed Lamia ◽  
Aliane Khaled ◽  
Z. Sari Hassoun
Keyword(s):  
Numerical Simulation ◽  
Velocity Field ◽  
Kinetic Energy ◽  
Three Dimensional ◽  
Governing Equations ◽  
Ansys Cfx ◽  
Recirculation Zones ◽  
Rectangular Obstacle ◽  
Volume Method ◽  
Calculation Code

In this work we study the influence of the inclined shape of the lover and downstream edge of a rectangular obstacle. We analyze the dimensions of the recirculation zones, the velocity field, the kinetic energy and the pressure. A three-dimensional study was conducted using the ansys cfx calculation code. The turbulence model k-ԑ is used to model turbulence, and the governing equations are resolved by the finite volume method.

Sediment Transport Calculation Considering Laminar and Turbulent Resistance Forces Caused by Infiltration/Exfiltration and Its Application to Tsunami-Induced Local Scouring

2013 ◽  
Vol 136 (1) ◽  
Author(s):  
Tomoaki Nakamura ◽  
Norimi Mizutani
Keyword(s):  
Sediment Transport ◽  
Three Dimensional ◽  
Interaction Model ◽  
Computational Accuracy ◽  
Scour Hole ◽  
Transport Calculation ◽  
Seaward Edge ◽  
Improved Model ◽  
Resistance Forces ◽  
Load Sediment

A sediment transport calculation was proposed, which consistently considered the influence of laminar and turbulent resistance forces caused by infiltration/exfiltration. From a comparison of the nondimensional bed–load sediment transport rate, it was found to be essential to consider both laminar and turbulent resistance forces when formulating the influence of infiltration/exfiltration in sediment transport calculations. A three-dimensional coupled fluid–structure–sediment interaction model was improved using the proposed sediment transport calculation, and applied to tsunami-induced local scouring around an inland structure. Numerical results showed that consideration of infiltration/exfiltration improved the computational accuracy of the prediction of a scour hole formed around the seaward edge of the structure, and accordingly the improved model could capture the evolution of the scour hole with sufficient accuracy. This suggests that the improved model should be a useful tool for assessing tsunami-induced local scouring.

Sediment Transport Calculation Considering Laminar and Turbulent Resistance Forces due to Infiltration/Exfiltration and its Application to Tsunami-Induced Local Scouring

2013 ◽  
Author(s):  
Tomoaki Nakamura ◽  
Norimi Mizutani
Keyword(s):  
Sediment Transport ◽  
Three Dimensional ◽  
Interaction Model ◽  
Resistance Force ◽  
Computational Accuracy ◽  
Scour Hole ◽  
Transport Calculation ◽  
Seaward Edge ◽  
Improved Model ◽  
Resistance Forces

A sediment transport calculation which consistently considers the effect of laminar and turbulent resistance forces due to infiltration/exfiltration was proposed. From a comparison of the non-dimensional bed-load sediment transport rate, it is found to be essential to consider laminar resistance force as well as turbulent resistance force when formulating the effect of infiltration/exfiltration in sediment transport calculations. The proposed sediment transport calculation was incorporated to improve a three-dimensional coupled fluid-structure-sediment interaction model, and the improved model is applied to tsunami-induced local scouring around an inland structure. Numerical results show that the consideration of infiltration/exfiltration improves the computational accuracy of a scour hole formed around the seaward edge of the structure, and accordingly the improved model can capture the evolution of the scour hole with sufficient accuracy. This suggests that the improved model is expected to be a useful tool for assessing tsunami-induced local scouring.

scholarly journals Safety Factors for Neutron Fluences in NPP Safety Assessment

2017 ◽  
Author(s):  
V. Diemiokhin ◽  
V. Bukanov ◽  
V. Ilkovych ◽  
A. Pugach
Keyword(s):  
Safety Factor ◽  
Safety Assessment ◽  
Neutron Fluence ◽  
Neutron Transport ◽  
Safety Factors ◽  
Neutron Fluences ◽  
Maximum Value ◽  
Transport Calculation ◽  
Calculation Code

In accordance with global practice and a number of existing regulations, the use of conservative approach is required for the calculations related to nuclear safety assessment of NPP. It implies the need to consider the determination of neutron fluence errors that is rather complicated. It is proposed to carry out the consideration by the way of multiplying the neutron fluences obtained with transport calculations by safety factors. The safety factor values are calculated by the developed technique based on the theory of errors, features of the neutron transport calculation code and the results obtained with the code. It is shown that the safety factor value is equal 1.18 with the confidence level of not less than 0.95 for the majority of VVER-1000 reactor places where neutron fluences are determined by MCPV code, and its maximum value is 1.25.

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