The complex core geometry of Pebble Bed Reactors (PBRs) necessitates multiscale techniquesfor accurate prediction of temperature and flow distributions. This paper presentsthe multiscale Thermal-Hydraulic (T/H) models used in the Pronghorn PBR simulationtool with application to the Mark-1 Pebble Bed Fluoride-Salt Cooled High-TemperatureReactor (PB-FHR). Pronghorn’s multiscale model is compared against a simpler modelrecently used for analysis of Doppler-driven transients in the PB-FHR. Comparisons withexplicitly-meshed pebbles show that Pronghorn can predict material-wise maximum andaverage temperatures to less than 10°C over a wide range of thermal conditions, whilethe simpler model is characterized by errors of 40 to 200°C. Steady-state analysis of thePB-FHR demonstrates Pronghorn’s capabilities as a multiscale T/H solver for PBRs.
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机译：鹅卵石床反应器（PBR）的复杂芯几何形状需要多尺度技术用于精确预测温度和流量分布。本文呈现Pronghorn PBR仿真中使用的多尺度热液压（T / H）型号用施用到Mark-1卵石床氟化盐冷却高温的工具反应器（PB-FHR）。将Pronghorn的MultiScale模型与更简单的模型进行比较最近用于分析PB-FHR中的多普勒驱动的瞬态。比较明确的鹅卵石表明，Pronghorn可以预测最大值和最大值在各种热条件下平均温度低于10°C，而且更简单的模型的特征在于40至200°C的误差。稳态分析PB-FHR展示了Pronghorn的能力作为PBR的MultiScale T / H求解器。
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