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Uchibori, Akihiro; Shiina, Yoshimi*; Watanabe, Akira*; Takata, Takashi*
Proceedings of 19th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-19) (Internet), 12 Pages, 2022/03
An unstructured mesh-based analysis method has been integrated into the sodium-water reaction analysis code, SERAPHIM, in our recent studies. In this study, numerical analysis of an experiment on sodium-water reaction in a tube bundle domain was performed to investigate the effect of the unstructured mesh. The unrealistic behavior appeared in the coarse structured mesh was improved by the unstructured mesh. The numerical result in the case of the unstructured mesh reproduced the peak value of the temperature in the reacting flow.
Uchibori, Akihiro; Shiina, Yoshimi*; Watanabe, Akira*; Takata, Takashi
Proceedings of 18th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-18) (USB Flash Drive), p.5315 - 5324, 2019/08
A computational fluid dynamics code SERAPHIM for a sodium-water reaction phenomenon has been developed. An unstructured mesh-based analysis method has been integrated into this code for evaluation in a complex-shaped domain including multiple heat transfer tubes in our recent studies. In this study, a numerical analysis of an experiment on sodium-water reaction in a tube bundle domain was performed to investigate applicability of the unstructured mesh-based SERAPHIM code. The formulated high-temperature region and its temperature level agreed with an experimental result.
Uchibori, Akihiro; Shiina, Yoshimi*; Watanabe, Akira*; Takata, Takashi
no journal, ,
A computational fluid dynamics code SERAPHIM for a sodium-water reaction phenomenon has been developed. An unstructured mesh-based analysis method has been integrated into this code for evaluation in a complex-shaped domain including multiple heat transfer tubes. In this study, a numerical analysis of an experiment on sodium-water reaction in a tube bundle domain was performed to investigate applicability of the unstructured mesh-based SERAPHIM code. The formulated high-temperature region and its temperature level agreed with an experimental result.
Uchibori, Akihiro; Shiina, Yoshimi*; Watanabe, Akira*; Takata, Takashi*
no journal, ,
A computational fluid dynamics code, SERAPHIM, for sodium-water reaction has been developed. An unstructured mesh-based analysis method was integrated into this code for a complex-shaped domain including multiple heat transfer tubes. In this study, both structured- and unstructured-mesh analyses of the experiment on sodium-water reaction in a tube bundle domain was performed to investigate. The analyses showed that non-physical flow behavior in the case of the coarse structured mesh was improved by the unstructured mesh.
Uchibori, Akihiro; Shiina, Yoshimi*; Kurihara, Akikazu; Okano, Yasushi; Saito, Masafumi*; Kaneko, Akiko*; Abe, Yutaka*
no journal, ,
In order to establish a safety evaluation method of a steam generator of sodium-cooled fast reactors, a computer program called SERAPHIM has been developed to calculate compressible multicomponent multiphase flow with sodium-water chemical reaction under tube failure accident. In this study, a numerical model for liquid droplet entrainment from an interface of the gaseous jet and its transport was validated through the analysis of experiment on vertical discharging of high-pressure air in a water pool. This model considers the mass, momentum, and energy conservation equations including the correlation of liquid droplet entrainment velocity. The numerical result showed the entrained liquid droplet phase was accelerated by the air jet. The calculated velocity of the liquid droplet falls within the dispersion of the measured data.
Uchibori, Akihiro; Shiina, Yoshimi*; Imai, Yasutomo*; Okano, Yasushi
no journal, ,
The design of a containment vessel in a sodium-cooled fast reactor was optimized from numerical analysis on the hypothetical severe accident including sodium leakage and combustion. The analysis method is one of the base technologies of the design optimization system, ARKADIA. The numerical analysis was performed on the different design conditions including volume of the containment vessel and the safety equipment as optimization parameters. The iterative numerical analysis successfully found that the safety under this accident was kept even in the downsized containment vessel by selecting an effective safety equipment. This numerical analysis demonstrated the basic capability of design optimization in ARKADIA.