MRANS方案的反应堆压力容器CFD仿真

CFD simulation of RPV based on MRANS scheme

摘要:

为提高反应堆压力容器（reactor pressure vessel,RPV）CFD(computational fluid dynamics)仿真的计算效率,将多湍流模型（multiple RANS model,MRANS）方案与RPV CFD仿真相结合,提出了一种新型的RPV CFD仿真方案,并通过优化传统棒束模拟MRANS方案的区域划分方法和数据传输方法使RPV MRANS CFD仿真方案的计算准确性得到保证。首先,对完整的压力容器模型进行CFD模拟,将整体计算结果与实验数据进行对比,验证所用CFD方法的有效性。其次,基于区域重叠的方案建立了下降段区域和下腔室区域的分段模型,并采用压力-流量双向数据传递方案,建立了多区CFD仿真计算方案。然后,分析不同的湍流模型在各区域的影响,选择合适的湍流模型。最后,以优化CFD仿真计算效率为目标,提出了两种MRANS方案。研究结果表明:基于区域重叠的双向数据传递方案相较于传统的单向数据传递方案,速度和压力计算结果与整体计算一致性更高；优化的MRANS方案相较于传统的单一湍流模型方案,计算效率提高了28.75%,从而验证了优化的MRANS具有高效率的特性。本研究成果为提高RPV CFD仿真效率提供了一种新思路和途径。

Abstract:

To improve the computing efficiency of the computational fluid dynamics (CFD) simulation of reactor pressure vessel (RPV), a novel CFD simulation scheme for RPV was proposed by combining the multiple RANS model (MRANS) with CFD simulation. The accuracy of the CFD simulation scheme using MRANS for RPV was guaranteed by optimizing the domain division technology and the data transmission method of traditional MRANS scheme which is used in rod bundle simulation. First, a CFD simulation of the integrated RPV model was carried out, and the validity of the CFD method was verified by comparing the calculated results with the experimental data. Then, based on the domain overlapping approach, the domain division model of downcomer (DC) and lowerplenum (LP) was built, and the modeling of multi-domain CFD simulation was carried out by using the two-way pressure-velocity data transfer method. Next, the performance of different turbulent models in each domain was compared and analyzed aiming to select the appropriate turbulent model. Finally, taking the computing efficiency of CFD simulation as the optimization objective, two MRANS schemes (RSM-SKE and RSM-RKE) were proposed. Results show that compared with the traditional domain division simulation scheme, the velocity and pressure calculated by the two-way domain division simulation scheme based on overlapping had better consistency with the integrated simulation results. The computing efficiency of the optimized MRANS scheme increased by 28.75% compared with the traditional single RANS model scheme, which proved that the optimized MRANS scheme has high efficiency in CFD simulation of RPV. The research results provide a new way of improving the efficiency of CFD simulation for RPV.