scholarly journals Status report on multigroup cross section generation code development for high-fidelity deterministic neutronics simulation system.

2008 ◽  
Author(s):  
W. S. Yang ◽  
C. H. Lee
Keyword(s):  
Cross Section ◽  
Simulation System ◽  
Status Report ◽  
High Fidelity ◽  
Code Development

scholarly journals Radar system simulation and non-Gaussian mathematical model under virtual reality technology

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Qiang Yi
Keyword(s):  
Mathematical Model ◽  
Virtual Reality ◽  
Cross Section ◽  
Radar System ◽  
Simulation System ◽  
Fusion Technology ◽  
Data Sequence ◽  
Virtual Reality Technology ◽  
Radar Systems ◽  
Non Gaussian

Abstract The characteristics of non-Gaussian clutter in radar systems are different from standard waveforms. To fully filter to achieve the accuracy of radar detection, the paper developed a radar simulation system based on virtual reality technology. The article uses a non-Gaussian mathematical model to simulate and collect the clutter generated by the system and realise the generation of data sequence according to the power spectrum. The research results show that the radar cross-section modelling, target recognition, anti-recognition and data fusion technology of visible targets can all be well applied in this system.

scholarly journals Status report on high fidelity reactor simulation.

2006 ◽  
Author(s):  
G Palmiotti ◽  
M Smith ◽  
C Rabiti ◽  
E Lewis ◽  
W Yang ◽  
...  
Keyword(s):  
Status Report ◽  
High Fidelity

Implementation of a Mixing Length Turbulence Formulation Into the Dynamic Wake Meandering Model

2012 ◽  
Vol 134 (2) ◽  
Author(s):  
Rolf-Erik Keck ◽  
Dick Veldkamp ◽  
Helge Aagaard Madsen ◽  
Gunner Larsen
Keyword(s):  
Cross Section ◽  
Turbulent Mixing ◽  
Eddy Viscosity ◽  
High Fidelity ◽  
Mixing Length ◽  
Two Dimensional ◽  
Wake Region ◽  
Mean Velocity ◽  
The Mean ◽  
The Difference

The work presented in this paper focuses on improving the description of wake evolution due to turbulent mixing in the dynamic wake meandering (DWM) model. From wake investigations performed with high-fidelity actuator line simulations carried out in ELLIPSYS3D, it is seen that the current DWM description, where the eddy viscosity is assumed to be constant in each cross-section of the wake, is insufficient. Instead, a two-dimensional eddy viscosity formulation is proposed to model the shear layer generated turbulence in the wake, based on the classical mixing length model. The performance of the modified DWM model is verified by comparing the mean wake velocity distribution with a set of ELLIPSYS3D actuator line calculations. The standard error (defined as the standard deviation of the difference between the mean velocity field of the DWM and the actuator line model), in the wake region extending from 3 to 12 diameters behind the rotor, is reduced by 27% by using the new eddy viscosity formulation.

scholarly journals HIGH-FIDELITY MULTI-PHYSICS PIN-BY-PIN MODEL OF A SVEA-96 OPTIMA2 ASSEMBLY WITH TORT-TD/CTF

2021 ◽  
Vol 247 ◽  
pp. 06035
Author(s):  
A. Seubert ◽  
Y. Périn ◽  
R. Henry
Keyword(s):  
Monte Carlo ◽  
Steady State ◽  
Fuel Assembly ◽  
Cross Section ◽  
Channel Model ◽  
High Fidelity ◽  
Code System ◽  
Cross Section Data ◽  
Section Data ◽  
Transient Simulations

This paper describes the development of a 3-d high-fidelity multi-physics pin-by-pin neu-tronic and sub-channel thermal hydraulic model of a SVEA-96 Optima2 fuel assembly for the coupled code system TORT-TD/CTF. No pin power reconstruction is applied. Detailed descriptions are given on (a) the generation of few-group parameterized pin cell-homogenized cross section data using HELIOS, (b) the 3-d neutronic pin-by-pin and ther-mal-hydraulic sub-channel model of a single SVEA-96 Optima2 assembly and its qualifica-tion by Monte Carlo models using Serpent, (c) coupled steady-state results for a single as-sembly and (d) coupled steady-state and transient simulations of a 4-by-4 mini core model of SVEA-96 Optima2 assemblies in a partially rodded state.

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