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FLUIDYN Case Studies

 

Fluidyn our case studies

 

List of a few :

 

Dynamic Analysis of a Reactor Core Shroud : The objective of this study is to find the acoustic loads on the reactor core shroud and the dynamic analysis of the shroud following instantaneous guillotine rupture of the recirculation pipe. Analysis was carried out using fluidyn-MP FSI, a coupled finite element and finite volume code, for solving fluid-structure mechanical interaction problems. High speed interaction between the structure and fluid requires simultaneous modelling of large deformations of structures and shock propagation in fluids. Finite Volume procedure is better suited to modelling varying flow regime and boundary condition in the fluid. Whereas, finite element procedure is suited for nonlinear transient stress analysis in the structure. Interaction also requires re-meshing of fluid domain to ensure that the fluid domain conforms to the deforming structure and that the effects of the structure deformation are imposed on the fluid. fluidyn-MP FSI code performs this re-meshing automatically.

 

Hydrogen distribution and recombination in the multi-compartment containment of a nuclear reactor : A study was was undertaken for a time dependant volumetric concentration of Hydrogen gas, which is injected in one of the compartments of a six compartment geometric configuration. Size and volumes of various compartments, interconnection details and location of hydrogen release were provided.

 

Analysis of Axi-symmetric Flow of a Liquid Metal with Proton Beam Heating : In this study a steady, 2D Conjugate Heat Transfer (fluidyn-MPCHT) analysis of an axi-symmetric flow of a liquid metal, with heat generation due to proton beam, is carried out. The liquid metal enters the domain at a constant flow rate. A metallic wall separates the inlet region from the outlet region. A proton beam heats the fluid in the region. Natural convection due to the heating that affects the flow field was considered. The objective of this study is to obtain the steady state temperature field in the liquid and the metallic separator and the flow field in the liquid. fluidyn-MP CHT was used to simulate steady conjugate heat transfer with heat generation in a 2D axi-symmetric geometry. The calculations clearly showed the natural convection in the fluid both in the heating zone and in the zone adjacent to the conducting metallic separator. The mesh used was sufficiently fine to produce separation bubble at the tip of the separator wall and other flow characteristics. The standard k-? model was able to resolve the re-circulations and separations.

 

Plug rupture in a tank containing liquid under high pressure : The case deals with the plug rupture in a container due to the release of high pressure inside the container. The container is rectangular and the rectangular explosive zone is placed at the centre and is located at certain distance from the bottom of the container. The container is partially filled with water and the remaining part is saturated vapor. The propagation of the rupture along the container wall and the resulting out flux of fluid are determined.

 

Vapor Front Propagation of a Two-Phase Jet Outflow : Vapor front of a two-phase jet outflow due to explosion in a container is studied here. The case deals 2D simulations for two-phase jet outflow through an orifice due to explosion in a container. The container is partially filled with water and the remaining part is saturated vapor. The container has a rectangular orifice. An explosion occurs releasing energy (~ pressure of 200 MPa) forcing the fluid from the container into another chamber containing saturated vapor. This chamber is open to atmosphere on two sides.

 

Flow Induced Vibration of a Sensor Rod : In this study, the vibration of a cylindrical sensor rod fitted inside a junction of a circular pipe is analysed. The junction has a complex shape. The flow of liquid in the pipe produces vortex shedding behind the sensor. This results in vibration of the rod. If the vortex shedding frequency and the natural frequency of the rod match, lock-in can occur resulting in structural damage to the rod. This study focused on one such lock-in phenomenon.

 

Thermal Analysis of Crucible under Heat Flux and Convection : In this study, a steady state thermal analysis of a crucible, subjected to heat flux and convection boundary conditions, is carried out.

 

Heat Transfer in fuel-rod touching a Cylindrical Pipe : A set of concentric cylinders, separated by different media (The inner two cylinders have a contact). The assembly is immersed in heavy water. A steady state temperature distribution in these cylinders is required.

 

Burning of PVC Cables in a room : A room contains many trays carrying combustible materials like PVC cables. One of the trays carrying PVC cables catches fire. The evolving fire plume and subsequent initiation of fire in other trays is studied.

 

Leakage and Atmospheric Dispersion of CO2 : Associated with Carbon Capture and Storage Projects - by Alberto Mazzoldi (Thesis submitted to the University of Nottingham for the degree of Doctor of Philosophy)

 

Study of Accidental Rejects on the Tarn River : River in the south of France. Field information about diffusion transport was sampled in different river discharge conditions by the use of two kinds of tracers: Rhodamine and Fluorescein. Numerical simulations were later implemented to reproduce additional scenarios. In this study, the aim is to improve in the selection of sample points for tracer campaigns and in the selection of numerical models for a realistic agreement with available information. Uncertainty in field information will influence the calibration phase in numerical models and by consequence the quality of the forecast.