scholarly journals Investigation of Coolant Local Hydrodynamics in the Mixed Core of the VVER Reactor

2020 ◽  
Vol 63 (2) ◽  
pp. 151-162
Author(s):  
S. M. Dmitriev ◽  
A. V. Gerasimov ◽  
A. A. Dobrov ◽  
D. V. Doronkov ◽  
A. N. Pronin ◽  
...  
Keyword(s):  
Cross Sections ◽  
Experimental Studies ◽  
Reactor Core ◽  
Cross Flow ◽  
Coolant Flow ◽  
Vver Reactor ◽  
Computational Hydrodynamics ◽  
Cross Section Area ◽  
Fuel Assemblies ◽  
Flow Pressure

The article presents the results of experimental studies of the local hydrodynamics of the coolant flow in the mixed core of the VVER reactor, consisting of the TVSA-T and TVSA-T mod.2 fuel assemblies. Modeling of the flow of the coolant flow in the fuel rod bundle was carried out on an aerodynamic test stand. The research was carried out on a model of a fragment of a mixed core of a VVER reactor consisting of one TVSA-T segment and two segments of the TVSA-T.mod2. The flow pressure fields were measured with a five-channel pneumometric probe. The flow pressure field was converted to the direction and value of the coolant velocity vector according to the dependencies obtained during calibration. To obtain a detailed data of the flow, a characteristic cross-section area of the model was selected, including the space cross flow between fuel assemblies and four rows of fuel rods of each of the TVSA fuel assemblies. In the framework of this study the analysis of the spatial distribution of the projections of the velocity of the coolant flow was fulfilled that has made it possible to pinpoint regularities that are intrinsic to the coolant flowing around spacing, mixing and combined spacing grates of the TVSA. Also, the values of the transverse flow of the coolant caused by the flow along hydraulically nonidentical grates were determined and their localization in the longitudinal and cross sections of the experimental model was revealed. Besides, the effect of accumulation of hydrodynamic flow disturbances in the longitudinal and cross sections of the model caused by the staggered arrangement of hydraulically non-identical grates was determined. The results of the study of the coolant cross flow between fuel assemblies interaction, i.e. between the adjacent TVSA-T and TVSA-T mod.2 fuel assemblies were adopted for practical use in the JSC of “Afrikantov OKB Mechanical Engineering” for assessing the heat engineering reliability of VVER reactor cores; also, they were included in the database for verification of computational hydrodynamics programs (CFD codes) and for detailed cell-based calculation of the reactor core.

scholarly journals Numerical Hydrodynamics: SPH versus AMR

2001 ◽  
Vol 200 ◽  
pp. 563-566
Author(s):  
Tomek Plewa
Keyword(s):  
Smoothed Particle Hydrodynamics ◽  
Adaptive Mesh Refinement ◽  
Mesh Refinement ◽  
Adaptive Mesh ◽  
Computational Hydrodynamics ◽  
Advantages And Disadvantages ◽  
Numerical Hydrodynamics ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

The advantages and disadvantages of two approaches to astrophysical hydrodynamics, Smoothed Particle Hydrodynamics (SPH) and Adaptive Mesh Refinement (AMR), are briefly discussed together with some current problems of computational hydrodynamics.

Computational Hydrodynamics for an Autonomous Underwater Vehicle With Moving Control Surfaces

2002 ◽  
Author(s):  
Abdollah Arabshahi ◽  
Howard J. Gibeling
Keyword(s):  
Control System ◽  
Autonomous Underwater Vehicle ◽  
Stokes Equations ◽  
System Development ◽  
Underwater Vehicle ◽  
Time Dependent ◽  
Navier Stokes ◽  
Computational Hydrodynamics ◽  
Flow Solver ◽  
Control Surfaces

The present study was undertaken to provide information for both design improvement and control system development during various stages of an autonomous underwater vehicle (AUV) development project. The need to establish a predictive capability for the hydrodynamic (control) coefficients for an AUV presented an opportunity to apply a multiblock incompressible Navier-Stokes flow solver which has evolved over many years. The solver utilizes a state-of-the-art implicit, upwind numerical scheme to solve the time-dependent Navier-Stokes equations in a generalized time-dependent curvilinear coordinate system. Domain decomposition is accomplished via a general unstructured multiblock approach. In addition, an efficient grid movement capability is incorporated in the code that will handle the relative motion of a multi-component configuration (e.g. oscillating control surfaces). Numerous simulations were conducted during the course of this work. The computations for vehicle and propulsor design consisted mainly of steady state axisymmetric computations, while for control system development both steady and unsteady (prescribed motion) simulations were conducted. The latter cases focus on the forces and moments on the vehicle that are needed for extraction of control information. A brief overview will be presented on the flow solver. This will be followed by a presentation of the numerical results.

Development and Verification of a Model of RVK-500, -1000 Recombiners for Modeling the Containment Shells of NPP with VVER by Computational Hydrodynamics

Atomic Energy ◽  
2017 ◽  
Vol 121 (3) ◽  
pp. 166-172 ◽  
Author(s):  
O. V. Tarasov ◽  
A. E. Kiselev ◽  
A. S. Filippov ◽  
T. A. Yudina ◽  
D. G. Grigoruk ◽  
...  
Keyword(s):  
Computational Hydrodynamics
Sign in / Sign up

Export Citation Format

Share Document