Multiscale analysis of core thermal-hydraulics



The objective of the multiscale core thermal-hydraulics from DNS to subchannel modelling sub-project SP2 is to develop a global modelling framework capable of dealing with thermal-hydraulics phenomena acting at several levels: from system-level and component-level scales down to the length scale of the bubble layer adjacent to the hot fuel-rod, and further down to the entrained droplets from ligaments and sheets forming at wall liquid films.

The project envisions contributing directly to the two lowest scales of the hierarchy, namely the mesoscale (fuel assembly) level and microscale (subgrid level), using a multiscale computational approach capable to transcend the scale barrier, by adopting specific computational strategies/models to specific flow portions.

The outcome should serve indirectly the upper system scale, a major part of which (core) will also be considered here as a porous medium. The rationale is simple: the great amount of financial resources devoted by utilities, government and industry to experimental thermal-hydraulics has shed light on various issues. However, a lot is still beyond reach of measurement technologies, thus requiring the use of detailed computational strategies.

In this context, detailed computational science amounts to using advanced, CPU-demanding simulations to understand basic heat and fluid flow phenomena and derive practical and useful models (upscaling) to be implemented in the development of CFD codes for component scale and system codes for the global reactor behaviour.

The objectives set for this sub-project are ambitious but several indicators plead in favour of their success. In light of achievements accomplished within NURESIM and NURISP, the project is now confident that only detailed computational strategies could shed light on subtle flow and heat transfer phenomena occurring at interfaces and near the walls, and help derive coarse-grained model.


< Multiphysics applications involving core physicsMultiscale and multiphysics applications of thermal-hydraulics >
NEWS AND EVENTS

SAVE THE DATE: 4-5 Nov 2015!
*Programme updated on 3 Nov

The NURESAFE Final seminar will be held on 4-5 November 2015 in Brussels, following the EUROSAFE Forum 2015 on 2-3 November 2015. The event will be open to the scientific community and other EU projects.

Registration & final programme available here >

November 2014:
Learn more on the NURESIM software (updated flyer)


October 2014:
Download the NURESAFE Newsletter Edition #1


16-17 June 2014:
NURESAFE General Seminar 2014 in Budapest:
Access all presentations here

April 2013:
Register for URANIE and SALOME training sessions (Closed)


28-30 Jan 2013:
NURESAFE kick-off meetings


1 Jan 2013:
Launch of the NURESAFE project

31 Dec 2012:
End of the FP7 NURISP project

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