Analysis of degassing time of pressurized water reactor pressurizer

Zhong, Xianping; Yu, Jiguo; Guo, Xiaoyu; Saeed, Muhammad

doi:10.1016/j.nucengdes.2018.01.023

Cited by 5 publications

(3 citation statements)

References 8 publications

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“…One is the simple scaling limiting procedure for the reconstructed or evolved solution polynomials in a finite volume or discontinuous Galerkin (DG) method, see e.g. [10,39,[43][44][45][46]48]. Another is the flux-corrected limiting procedure, which can be used on high-order finite difference, finite volume and DG methods, see e.g.…”

Section: Introductionmentioning

confidence: 99%

Design of provably physical-constraint-preserving methods for general relativistic hydrodynamics

2017

Phys. Rev. D

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The paper develops high-order physical-constraint-preserving (PCP) methods for general relativistic hydrodynamic (GRHD) equations, equipped with a general equation of state. Here the physical constraints, describing the admissible states of GRHD, are referred to the subluminal constraint on the fluid velocity and the positivity of the density, pressure and specific internal energy. Preserving these constraints is very important for robust computations, otherwise violating one of them will lead to the ill-posed problem and numerical instability. To overcome the difficulties arising from the inherent strong nonlinearity contained in the constraints, we derive an equivalent definition of the admissible states. Using this definition, we prove the convexity, scaling invariance and LaxFriedrichs (LxF) splitting property of the admissible state set G, and discover the dependence of G on the spacetime metric. Unfortunately, such dependence yields the non-equivalence of G at different points in curved spacetime, and invalidates the convexity of G in analyzing PCP schemes. This obstacle is effectively overcame by introducing a new formulation of the GRHD equations. Based on this formulation and the above theories, a first-order LxF scheme is designed on general unstructured mesh and rigorously proved to be PCP under a CFL condition. With two types of PCP limiting procedures, we design high-order, provably (not probably) PCP methods under discretization on the proposed new formulation. These high-order methods include the PCP finite difference, finite volume and discontinuous Galerkin methods.

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Section: Introductionmentioning

confidence: 99%

Design of provably physical-constraint-preserving methods for general relativistic hydrodynamics

2017

Phys. Rev. D

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“…In the mixed convection process of hot and cold fluids, buoyancy is one of the important analytical indicators. The flow strength induced by buoyancy can be determined by the ratio of buoyancy to inertia force, namely, the dimensionless Richardson number (Ri), and as shown in (1)- (3). It can be seen that dimensionless Gr and Re are measures of buoyancy lift and fluid inertia forces, respectively.…”

Section: Mesh Generation Methodologiesmentioning

confidence: 99%

“…The pressurizer is the main equipment of PWR power plant pressure safety system [3] and the electric heaters are its central part. During actual operation, the electric heaters are subjected to ultra-high water pressure, transient extreme temperature changes, high radiation doses, and other severe tests.…”

Section: Introductionmentioning

confidence: 99%

Research of PWR Pressurizer Insurge Characteristics on Three-Dimensional Transient Modeling

Liu

Zhang

Shi

et al. 2018

Science and Technology of Nuclear Installations

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In order to study the evolution process and hydraulic characteristics of pressurizer insurge in CPR1000 pressurized water reactor (PWR), the computational fluid dynamics (CFD) of three-dimensional unsteady heat transfer was used to capture the temperature and velocity fluctuation intensity of the mixing of the hot and cold. The results show that Realizable k–ε Turbulence Model combined with VOF multiphase heat transfer model can effectively predict the development trend of pressurizer insurge process. The small diameter pressurizer surge line of CPR1000 enhances the intensity of velocity fluctuation. From the essence of flow and heat transfer, it is concluded that buoyancy force can increase the degree of fluctuation and make an accelerated effect on the influx cold fluid. The electric heater inside the pressurizer should be arranged as far as possible in z<-0.45m and z>0.45m; it is beneficial to improve its harsh operating environment. This research can provide reference for the structural design of pressurizer and the layout optimization of the electric heater.

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Development of a Lumped Parameter Dynamic Degassing Model for Spray-Heating Degasser and Its Application in the Pressurizer of a Pressurized Water Reactor

Zhong

Zhang

et al. 2020

Nuclear Technology

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Analysis of degassing time of pressurized water reactor pressurizer

Cited by 5 publications

References 8 publications

Design of provably physical-constraint-preserving methods for general relativistic hydrodynamics

Design of provably physical-constraint-preserving methods for general relativistic hydrodynamics

Research of PWR Pressurizer Insurge Characteristics on Three-Dimensional Transient Modeling

Development of a Lumped Parameter Dynamic Degassing Model for Spray-Heating Degasser and Its Application in the Pressurizer of a Pressurized Water Reactor

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