Emerging Technologies for FETCH2 Jeff Gomes Applied Modelling and Computation Group (AMCG) Severe...
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Transcript of Emerging Technologies for FETCH2 Jeff Gomes Applied Modelling and Computation Group (AMCG) Severe...
Emerging Technologies for FETCH2
Jeff GomesApplied Modelling and Computation Group
(AMCG)
Severe Accident Subproject Meeting14/11/2011
Outline
Multi-Physics Software Suite;
Next-Generation Multiphase Flow Dynamic
core (synergy between projects within
AMCG);
Emerging Multi-Physics Technologies.
AMCG: Multi-Physics Software Suite
Fluidity (Multiphase)
EVENT (Radiation Transpot)
FETCH (coupled Multiphase
and RT)
Fluidity-ICOM (CFD, single phase,
multi-material)
Fluidity-Multiphase(CMFD)
VGeST (DEM, FEMDEM)
Radiant (RT)
FETCH-2(couples multiphase,
RT and structural response)
Legacy• Fissile solutions,
porous media matrix, reactors;
• Compressible (with phase change) and incompressible flows;
• Simple structural mechanics response (i.e., limited stress failure criteria);
• Quad/Hex finite elements with CV representation of scalar fields (no parallel adaptivity);
Add an adaptivity library which performs topological operations on the mesh, and mesh movement, to optimise the size and shape of elements in response to error measures
Working robustly and efficiently in parallel
Also building an adjoint to the model for data assimilation, sensitivity studies and goal-based error estimation
Make use of open source solutions for solvers, preconditioners, I/O, visualisation, etc
Multi-Physics ModelsFinite/Discrete Element
Methods;Particle modelling (Newton
Law) and structural mechanics (material engineering – stress modelling);
One-/Two-Way coupling with Fluidity;
Used in coastal defence, reservoir fractures and particle flows applications;
But can be potentially used in nuclear engineering (geological waste repository and stress-induced core fractures and degradation in reactors)
Page 4
AMCG: Multi-Physics Software Suite
Research & Development:Emerging Technologies
(Improving Modelling Functionality)
R&D (Cross-Cutting activities), 2010-2014
AMCGNew Dynamic Core
for multiphase flow inFluidity
FP7/THINS:Discretisation
Methods
FP7/GoFastR& EPSRC-SA:
Safety Assessment in reactors (severe
accident scenarios)
EPSRC-MBase/B&
W:Criticality in Fissile
Solutions
Qatar Petroleum/ShellNew Model for
Reservoir Simulator
FETCH2 FETCH2
Lower frame shows the domain decomposition which has been optimised to balance the load based on number of nodes and minimised edge cut
Emerging Technologies: Mesh Adaptivity and Domain
Decomposition
Page 8
Movie
Emerging Technologies: Mesh Adaptivity and Domain Decomposition – lock-exchange
problem (P1DGP2 balance element)
Compressible high-resolution control volume advection methods combined with moving and adaptive meshes;
Limiting schemes to ensure conservative and bounded solutions;
Arbitrary number of materials can be tracked.
Emerging Technologies: Multi-Material Interface Tracking
(moving and adaptative meshes)
Emerging Technologies: Multi-Material Interface Tracking (3
materials)
Page 11
‘donor’ mesh
‘target’ mesh
‘super mesh’ and mapping from donor
mesh
Following construction of the supermesh we are able to perform projection operations to achieve conservative, bounded (etc…) interpolation schemes. 2D: Farrell et al., 20093D: Farrell, Maddison, 2009
Emerging Technologies: Conservative interpolation – crucial for many
applications with mesh adaptivity and coupled models
FEM
Emerging Technologies: Finite/Discrete Element Methods (FEMDEM)
DEM+
Emerging Technologies: Finite/Discrete Element Methods (FEMDEM)
Land-slide andIdealised coastal defence
Emerging Technologies: Finite/Discrete Element Methods (FEMDEM)
Idealised coastal defence accropode blocks;Study of stress-induced fractures for different block designs.
One-/Two-way coupling of Fluids and Solids (Capturing Interactions)
In Fluidity, solid is treated as fluid (multiphase flow)
1 mesh for the domain (fluid), 1 mesh for solid: user-friendly as it is easy to generate the meshes of complex solids
Usage of Conservative Interpolation in order to obtain solid's location on the fluids mesh
Exchange of momentum and location between solids and fluid at each time-step
Introducing third phase: Air (acting as a surface)
Emerging Technologies: Immersed-Body Method (Fluid-Solid Interaction
Modelling)
Emerging Technologies: Immersed-Body Method (Fluid-Solid Interaction
Modelling)
Re=5k
Re=1k
Immersed-Body Method
Emerging Technologies: Immersed-Body Method (Fluid-Solid Interaction
Modelling)
Emerging Technologies:Thermo-Chemical Modelling
Initial generic chemical modelling framework for geochemistry application (funded by QCCRSC Programme) for oil/gas reservoirs, CO2 sequestration and storage aquifers (PhD student);
Chemical kinetics and thermodynamic equilibrium;In order to improve of our understanding of a set of SA
phenomenology we need a sophisticated thermo-chemical model framework within (or coupled to) FETCH2 with a reliable chemical-kinetics library covering:
Chemical reactions and advanced thermodynamics (EOS phase change);
Back-up Slides
Code repository;Automatic and continuous verification & validation;More than 100 verification & validation test-cases for RT;More than 1000 verification & validation test-cases for CFD
(including unit-tests);Large number of benchmark tests for the coupled formulation
(e.g., TRACY, SILENE, CRAC, SUPO, HTR, Shipping-port reactor and other AIEA –based tests)
Full documentation; International training (e.g., B&W, LANL, Y12, open-source
community, etc)
Research & Development Model and Software Quality Assurance
Research & Development Model and Software Quality Assurance