SIMMER code two-fluid model well-posedness and stability for simulating liquid metal (lead–lithium eutectic), water vapor, and non-condensable gases multi-component multi-phase flows

• DOI: 10.1016/j.pnucene.2024.105279
• Publication Date: 2024-05-23T00:23:37Z
• Authors: Satya Prakash Sar...; Nicola Forgione
• Keywords: Component (thermodynamics); Lead (geology); Liquid metal

Liquid metals are employed as a coolant in liquid metal fast reactors (LMFR) and considered breeders coolants for future power-producing fusion reactors. The interaction of with other coolants, such air water, is one the possible occurrences metal-cooled Although SIMMER-III computer code currently validation verification phase, it prospective candidate correctly investigating accidents. This study aims to determine stability well-posedness Eulerian-Eulerian two-fluid model (TFM) under any accident scenario. work also considers influence virtual mass force diffusion forces momentum on TFM accelerated metal, steam, non-condensable gaseous flows throughout all flow regimes. characteristics method used assess ill-posed nature types accidents scenarios hypothetical simplified system several components (Lead–Lithium, gases, water vapor). It has been discovered that analysis findings vary from two-component two-phase (characteristics roots spectrum error growth rate patterns) particularly sensitive coefficients. because have higher density than resulting strong weak liquid-metal gas flows. Because extensive range interactions between fluxes different components, producing an accurate representation multi-component mixtures difficult. this, strongly suggested coefficient coefficients be handled more accurately these kinds values significantly affect how proposed predictions are, but there hasn't much research estimate them. sheds light model's accuracy highlights areas where will mathematically trustworthy.