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270 Thermal Hydraulics Aspects of Liquid Metal Cooled Nuclear Reactors

of V-LES/T-DNS was practically proven as far as the Peclet number of the flow is
moderate. Obviously such highly resolved LES are not affordable for industrial com-
putations, and remain limited to rather simple geometries; they are moreover much
less CPU demanding than DNS for similar conditions, and as such, they are the
method of choice for high Reynolds flows. Their practical use has been demonstrated
in Duponcheel et al. (2014) to define new best practice guidelines for the RANS
approach as well as a validation tool for the development of new nonlinear models
or higher-order closures. Finally, this chapter is not complete as far as numerical tech-
niques, boundary/initial conditions, etc. are concerned, and the reader is referred to
dedicated books such as Sagaut (2006) and Pope (2000) or Ferziger and Peri c (2002).
References

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