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首页> 外文期刊>International Journal of Heat and Mass Transfer >The Dynamic-Implicit-Additional-Source (DIAS) method for multi-scale coupling of thermal-hydraulic codes to enhance the prediction of mass and heat transfer in the nuclear reactor pressure VESSEL
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The Dynamic-Implicit-Additional-Source (DIAS) method for multi-scale coupling of thermal-hydraulic codes to enhance the prediction of mass and heat transfer in the nuclear reactor pressure VESSEL

机译：动态-附加-源（DIAS）方法用于热工代码的多尺度耦合，以增强对核反应堆压力VESSEL中质量和热传递的预测

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The paper describes a Dynamic-Implicit-Additional-Source (DIAS) method for a domain-overlapped multi-scale coupling of a system-code, sub-channel code, and CFD code aiming to improve the simulation of the thermal-hydraulics phenomena e.g. the heat, mass, solute transfer in the Nuclear Reactor Pressure Vessel (RPV). This method is developed to correlate the essential physical parameters predicted by the nuclear system thermal-hydraulic code with more precise data derived from sub-channel or Computational Fluid Dynamic (CFD) solutions, enabling the system-code to produce more realistic mass and heat transfer within the RPV. The DIAS-method is used in combination with the domain-overlapping coupling approach and it currently correlates four system-codes parameters: the coolant velocity, the pressure drop, the coolant temperature, and the boron concentration. The three-dimensional velocity and pressure fields predicted by a sub-channel or CFD codes are used to calculate the new friction and form loss coefficients on the fly (in the momentum equation) at all the overlapped edges in the system-code with increased accuracy. Additionally, the coolant temperature distribution predicted by the system-code is correlated based on the three-dimensional temperature field gained from the sub-channel or CFD codes by adding a dynamic-implicit heat source or sink to the energy equation. Such kind of source/sink was also added to the solubility equation of the system-code to predict the boron concentration based on the corresponding high-resolution fields provided by the high-resolution thermal-hydraulic solvers. All of the three newly added items are named as the Dynamic-I mplicit-Additional-Source (DIAS) since they are not the traditional fixed-explicit appendixes to the original system of governing equation set but they are dynamically tuned and implicitly calculated along with the solution process. The complete DIAS-method was verified with an academic 3D coolant-mixing problem in a Reactor Pressure Vessel (RPV). Results obtained from the test cases indicate that the mass, heat and solute transfer in the RPV could be better predicted by the coupled codes with the DIAS method. Finally, the DIAS method is proved an efficient and powerful approach for multi-scale thermal-hydraulic coupling based on the domain-overlapping approach.
机译：本文描述了一种动态隐式附加源（DIAS）方法，用于系统代码，子通道代码和CFD代码的域重叠多尺度耦合，旨在改善对热工液压现象的仿真。核反应堆压力容器（RPV）中的热量，质量，溶质传递。开发此方法的目的是将核系统热工代码预测的基本物理参数与从子通道或计算流体力学（CFD）解决方案中得出的更精确数据相关联，从而使系统代码能够产生更真实的质量和热传递在RPV中。 DIAS方法与域重叠耦合方法结合使用，当前它与四个系统代码参数相关：冷却剂速度，压降，冷却剂温度和硼浓度。由子通道或CFD代码预测的三维速度和压力场用于在系统代码中所有重叠的边沿上（在动量方程中）动态计算新的摩擦系数和形成损耗系数。另外，通过将动态隐式热源或热沉添加到能量方程中，基于从子通道或CFD代码获得的三维温度场，对由系统代码预测的冷却液温度分布进行关联。此类源/接收器也已添加到系统代码的溶解度方程中，以根据高分辨率热工液压求解器提供的相应高分辨率场来预测硼浓度。所有这三个新添加的项均被称为动态I附加项源（DIAS），因为它们不是控制方程组原始系统的传统固定显式附录，但它们会随着与之一起动态调整和隐式计算解决过程。完整的DIAS方法已通过反应堆压力容器（RPV）中的学术3D冷却剂混合问题进行了验证。从测试案例获得的结果表明，通过DIAS方法的耦合代码可以更好地预测RPV中的质量，热量和溶质传递。最后，基于域重叠法，DIAS方法被证明是用于多尺度热工-液压耦合的一种有效而强大的方法。

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