Possibilities and Limitations of CFD Simulation for Flashing Flow Scenarios in Nuclear Applications
The flashing phenomenon is relevant to nuclear safety analysis, for example by a loss of coolant accident and safety release scenarios. It has been studied intensively by means of experiments and simulations with system codes, but computational fluid dynamics (CFD) simulation is still at the embryon...
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Online Access: | http://www.mdpi.com/1996-1073/10/1/139 |
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doaj-eddd9ba201ea4a19a2ee97aad526a5f22020-11-25T00:45:16ZengMDPI AGEnergies1996-10732017-01-0110113910.3390/en10010139en10010139Possibilities and Limitations of CFD Simulation for Flashing Flow Scenarios in Nuclear ApplicationsYixiang Liao0Dirk Lucas1Gesellschaft für Anlagen-und Reaktorsicherheit, Boltzmannstraße 14, 85748 Garching bei München, GermanyHelmholtz-Zentrum Dresden-Rossendorf, Institute of Fluid Dynamics, Bautzner Landstraße 400, 01328 Dresden, GermanyThe flashing phenomenon is relevant to nuclear safety analysis, for example by a loss of coolant accident and safety release scenarios. It has been studied intensively by means of experiments and simulations with system codes, but computational fluid dynamics (CFD) simulation is still at the embryonic stage. Rapid increasing computer speed makes it possible to apply the CFD technology in such complex flow situations. Nevertheless, a thorough evaluation on the limitations and restrictions is still missing, which is however indispensable for reliable application, as well as further development. In the present work, the commonly-used two-fluid model with different mono-disperse assumptions is used to simulate various flashing scenarios. With the help of available experimental data, the results are evaluated, and the limitations are discussed. A poly-disperse method is found necessary for a reliable prediction of mean bubble size and phase distribution. The first attempts to trace the evolution of the bubble size distribution by means of poly-disperse simulations are made.http://www.mdpi.com/1996-1073/10/1/139flashingcomputational fluid dynamics (CFD) simulationtwo-fluid-modelmono-dispersepoly-disperse |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yixiang Liao Dirk Lucas |
spellingShingle |
Yixiang Liao Dirk Lucas Possibilities and Limitations of CFD Simulation for Flashing Flow Scenarios in Nuclear Applications Energies flashing computational fluid dynamics (CFD) simulation two-fluid-model mono-disperse poly-disperse |
author_facet |
Yixiang Liao Dirk Lucas |
author_sort |
Yixiang Liao |
title |
Possibilities and Limitations of CFD Simulation for Flashing Flow Scenarios in Nuclear Applications |
title_short |
Possibilities and Limitations of CFD Simulation for Flashing Flow Scenarios in Nuclear Applications |
title_full |
Possibilities and Limitations of CFD Simulation for Flashing Flow Scenarios in Nuclear Applications |
title_fullStr |
Possibilities and Limitations of CFD Simulation for Flashing Flow Scenarios in Nuclear Applications |
title_full_unstemmed |
Possibilities and Limitations of CFD Simulation for Flashing Flow Scenarios in Nuclear Applications |
title_sort |
possibilities and limitations of cfd simulation for flashing flow scenarios in nuclear applications |
publisher |
MDPI AG |
series |
Energies |
issn |
1996-1073 |
publishDate |
2017-01-01 |
description |
The flashing phenomenon is relevant to nuclear safety analysis, for example by a loss of coolant accident and safety release scenarios. It has been studied intensively by means of experiments and simulations with system codes, but computational fluid dynamics (CFD) simulation is still at the embryonic stage. Rapid increasing computer speed makes it possible to apply the CFD technology in such complex flow situations. Nevertheless, a thorough evaluation on the limitations and restrictions is still missing, which is however indispensable for reliable application, as well as further development. In the present work, the commonly-used two-fluid model with different mono-disperse assumptions is used to simulate various flashing scenarios. With the help of available experimental data, the results are evaluated, and the limitations are discussed. A poly-disperse method is found necessary for a reliable prediction of mean bubble size and phase distribution. The first attempts to trace the evolution of the bubble size distribution by means of poly-disperse simulations are made. |
topic |
flashing computational fluid dynamics (CFD) simulation two-fluid-model mono-disperse poly-disperse |
url |
http://www.mdpi.com/1996-1073/10/1/139 |
work_keys_str_mv |
AT yixiangliao possibilitiesandlimitationsofcfdsimulationforflashingflowscenariosinnuclearapplications AT dirklucas possibilitiesandlimitationsofcfdsimulationforflashingflowscenariosinnuclearapplications |
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