Numerical Simulation, An Art of Prediction, Volume 2 by Jean-François Sigrist

Author:Jean-François Sigrist [Jean-François Sigrist]
Language: eng
Format: epub
Publisher: Wiley-ISTE
Published: 2020-02-04T16:00:00+00:00

NOTE.– Representing heat exchanges accurately.

In a reactor, the heat exchanges between the core and the primary fluid guarantee its operation. They occur in the vicinity of the fuel elements and local flow conditions greatly influence them: the most homogeneous fluid flow possible is favorable to them.

Mixing grids, made of metal fins, disturb the flow to obtain the desired conditions. Turbulence is developing fully and can only be accurately represented with appropriate modeling.

The simulation allows us to validate a design and the complete choice of tests performed on a test device representative of the mixing zone. Representing very finely the experiment, the calculation reproduces the geometry of grids and fins and turbulent phenomena at small scales (Figure 5.12).

“Such simulations require significant human and computer resources. Reaching an unprecedented level of accuracy, they require several weeks of mesh preparation time; they then mobilize nearly 10,000 cores on supercomputers for several months, and their analysis still requires several months of work on the part of experts!”

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