In Japan Atomic Energy Agency (JAEA), simulation code “MUGTHES (MUlti Geometry simulation code for THErmal-hydraulic and Structure heat conduction analysis in boundary fitted coordinate)” has been developed to evaluate thermal striping phenomena that are caused by turbulence mixing of fluids in different temperature. MUGTHES employs Boundary Fitted Coordinate (BFC) system to treat complex geometries in power plants. And MUGTHES can deal with three-dimensional transient thermal-hydraulic problem coupled with three-dimensional transient heat conduction in the surrounding structure in consideration of conjugated heat transfer. In this paper, numerical schemes for thermal-hydraulic simulation employed in MUGTHES are described including LES model. A simple method to limit numerical oscillation is adopted in energy equation solving process. A new iterative method to solve Poisson equation in BFC system is developed for effective transient calculations. This method is based on BiCGSTAB method and SOR technique. As the code validation of MUGTHES, a numerical simulation in a T-junction piping system with LES approach was conducted. Numerical results related to velocity and fluid temperature distributions were compared with an existing water experimental data and the applicability of numerical schemes with LES model in MUGTHES to the thermal striping phenomenon was confirmed.
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16th International Conference on Nuclear Engineering
May 11–15, 2008
Orlando, Florida, USA
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
0-7918-4815-9
PROCEEDINGS PAPER
Numerical Simulation of Thermal Striping Phenomena in T-Junction Piping System Using Large Eddy Simulation Available to Purchase
Masa-Aki Tanaka,
Masa-Aki Tanaka
Japan Atomic Energy Agency, O-arai, Ibaraki, Japan
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Hiroyuki Ohshima,
Hiroyuki Ohshima
Japan Atomic Energy Agency, O-arai, Ibaraki, Japan
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Hideaki Monji
Hideaki Monji
University of Tsukuba, Tsukuba, Japan
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Masa-Aki Tanaka
Japan Atomic Energy Agency, O-arai, Ibaraki, Japan
Hiroyuki Ohshima
Japan Atomic Energy Agency, O-arai, Ibaraki, Japan
Hideaki Monji
University of Tsukuba, Tsukuba, Japan
Paper No:
ICONE16-48667, pp. 481-490; 10 pages
Published Online:
June 24, 2009
Citation
Tanaka, M, Ohshima, H, & Monji, H. "Numerical Simulation of Thermal Striping Phenomena in T-Junction Piping System Using Large Eddy Simulation." Proceedings of the 16th International Conference on Nuclear Engineering. Volume 2: Fuel Cycle and High Level Waste Management; Computational Fluid Dynamics, Neutronics Methods and Coupled Codes; Student Paper Competition. Orlando, Florida, USA. May 11–15, 2008. pp. 481-490. ASME. https://doi.org/10.1115/ICONE16-48667
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