supporting research – integration of innovative reactor physics methods into transient criticality...
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Supporting research – integration Supporting research – integration of innovative reactor physics methods of innovative reactor physics methods
into transient criticality modelling: into transient criticality modelling: Towards a Next Generation FETCHTowards a Next Generation FETCH
Overview of new methods integration into FETCHOverview of new methods integration into FETCH• Robust, adaptive RT methods
Adaptivity in space, energy, angle and time (full adaptivity)
Robust, sub-grid scale methods for numerical stability
Fast hierarchical solvers in space and angle
• Robust, CFD methods for systems with shocks
New schemes for modelling shocks
Towards an unstructured mesh FETCH capability
• Uncertainty Propagation Methods
SFEM for RT
SFEM for multiphase CFD
Coupled modelling SFEM
Fully adaptive RT methods tailoring themselves to the Fully adaptive RT methods tailoring themselves to the physics of the problem (to a given resolution scale).physics of the problem (to a given resolution scale).
Fully adaptive, fast, robust RT framework
(with appropriate adjoint error metrics)
Adaptive spatial meshing Anisotropic adaptivity in angle
Adaptivity in energy Adaptivity in time
Hierarchical solvers
Sub-grid scale
stabilisation
Shock wave capturing, unstructured Multi-phase Shock wave capturing, unstructured Multi-phase flow Modellingflow Modelling
• Multi-phase flow modelling is currently structured mesh based with a pressure corrected shock capturing scheme
• New developments to include unstructured capability as well as numerically “robust” Riemann based shock capturing schemes.
Results from a expanding shock wave in a postulated waste repository scenario
Uncertainty Methods for Improved Engineering designUncertainty Methods for Improved Engineering design
Methods to improve the design of complex engineering systems subject to multiple uncertainties
Uncertainties during engineering design can affect the system
• Safety
• Reliability
• Performance
• Cost
• Risk
Multiphysics SFEM uncertainty methodsMultiphysics SFEM uncertainty methodsNew approach for modelling New approach for modelling multiple uncertaintiesmultiple uncertainties using using stochastic finite elementsstochastic finite elements
Fluid dynamics processes Nuclear ProcessesInput uncertainties
Probability distributions of outputs
Power, fission rate, temperatures, pressures
Funding of these initiativesFunding of these initiatives
• Five year RAEng Fellowship in Uncertainty Methods
• Eng Doc Student on uncertainty in nuclear data in collaboration with Nexia/Serco Assurance – student David Perry
• EPSRC student underpinning the group’s work on shock wave modelling, unstructured multiphase flow – work towards an unstructured mesh FETCH capability – student Justin Hadi
• KNOO funded EPSRC student on SFEM for single phase flow
- student Andrew Hagues
• Part time Imperial PRI/AWE PhD student on radiation methods
- student Simon Merton
• Imperial/Rolls-Royce Eng Doc on radiation methods
- student Christopher Baker
• Imperial/Rolls-Royce Eng Doc on thermal-hydraulics
- student Emily Julian