Uncertainty quantification study of CFD on the rod bundle flow

Hao SHEN; Jinbiao XIONG; Xu CHENG

doi:10.11889/j.0253-3219.2018.hjs.41.030601

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Uncertainty quantification study of CFD on the rod bundle flow

NUCLEAR ENERGY SCIENCE AND ENGINEERING | 更新时间：2021-05-19

- Uncertainty quantification study of CFD on the rod bundle flow
- NUCLEAR TECHNIQUES Vol. 41, Issue 3, Article number: 030601(2018)
- 作者机构：
  
  上海交通大学核科学与工程学院上海 200240
- 作者简介：
- 基金信息：
  
  Supported by the Coordinated Research Project (CRP) of International Atomic Energy Agency
- DOI：10.11889/j.0253-3219.2018.hjs.41.030601
  CLC： TL99
- Received：06 December 2017，
  
  Revised：25 December 2017，
  
  Published：10 March 2018
- 稿件说明：
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Hao SHEN, Jinbiao XIONG, Xu CHENG. Uncertainty quantification study of CFD on the rod bundle flow[J]. Nuclear techniques, 2018, 41(3): 030601
DOI：

Hao SHEN, Jinbiao XIONG, Xu CHENG. Uncertainty quantification study of CFD on the rod bundle flow[J]. Nuclear techniques, 2018, 41(3): 030601 DOI： 10.11889/j.0253-3219.2018.hjs.41.030601.

摘要

核燃料组件是核反应堆的核心部件，其最常见的几何结构为棒束结构，计算流体力学（Computational Fluid Dynamics，CFD）作为一种辅助工具正大量地用于棒束的流动分析之中，但是国内外尚无统一的最佳实践方法，CFD模拟结果可信度存在争议。另外由于现在的CFD分析均是基于确定性的几何条件以及边界条件下进行，在真实的物理条件下存在大量的不确定性，这些不确定性会对模拟结果的可信度带来挑战。传统的不确定分析方法如蒙特卡罗抽样，因其巨量的计算不适用于CFD的不确定性分析。本文通过对网格、湍流模型以及壁面处理的分析，总结出棒束单相CFD的最佳实践方法，在此基础上，利用敏感性系数法着重分析壁面函数中

的不确定性对预测压降的影响，结果显示：压降预测不确定性为96.11 Pa。

Abstract

Background

The rod bundle is the most common geometric structure of nuclear fuel assembly which is the core component of nuclear reactor. Computational fluid dynamics (CFD)

as an auxiliary tool

is widely used in the flow analysis of rod bundles

but there is no unanimous CFD application method

nor the best practices guideline. As a result

the CFD simulation credibility is controversial. Meanwhile

CFD analysis is based on the certain geometry and boundary conditions

while large uncertainty exists in the physical conditions

which will challenge the credibility of the simulation results.

Purpose

This study aims to find a new method to do the uncertainty quantification of the CFD simulation for the flow analysis of rod bundles.

Methods

Considering the fact that traditional uncertain analysis methods

such as Monte Carlo sampling

are not applicable to the uncertainty analysis of CFD because of its huge amount of calculation

the first step was to sum up the best practice method of CFD on the single-phase rod bundle flow

based on the analysis of grid

turbulence model and wall treatment. Thereafter

the sensitivity coefficient method was used to analyze the influence of wall function uncertainty in the prediction of pressure drop.

Results

The simulation results show that the forecast uncertainty for pressure drop is 3.2%.

Conclusion

The best practice method of CFD combined with the sensitivity coefficient method can be used to analyze the uncertainty quantification of the CFD simulation the flow analysis of rod bundles.

关键词

Keywords

references

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