The scientific areas covered by this proposal merge multiphysics modelling and High Performance Computing (HPC) together. The areas covered by multiphysics modelling will deal first with Conjugate Heat Transfer (CHT), where traditional Computational Fluid Dynamics (CFD) is coupled to solid heat diffusion, and then with turbomachinery for the example of a flow in a pump in the turbulent regime.

Turbulence modelling will be covered, by looking at advanced modelling through Large-Eddy Simulation (LES) and Reynolds Averaged Navier Stokes (RANS) models. LES is a technique which relies on filtering the Navier-Stokes equations, that was first introduced by Smagorinsky in 1963 [1]. It has become much more popular recently because of the computing power increase, even if still not routinely used by industry. Vast computing power is required because modelling is only carried out at the sub-grid scale level. This aspect of turbulence modelling will be coupled with heat diffusion in a solid for a CHT case of a heated cross flow inside a rod bundle, which corresponds to a typical application for heat exchangers in thermal power generation.

RANS modelling will be used to simulate the flow in a pump, using a Reynolds Stress Model [2] to account for flow anisotropy.

The School will insist on both interlinked aspects between advanced multiphysics modelling, and HPC, showing that the former applied to some cutting edge applications related to power generation cannot be carried out without HPC capabilities. The path for developing/optimising a massively parallel multiphysics HPC software will also be introduced [3], and recent developments related to GPU porting and performance will also be given.

REFERENCES

[1] J. Smagorinsky, Mon. Wea. Rev., 91, 99-164 (1963).
[2] C. Speziale, S. Sarkar, T. Gatski, J. Fluid Mech., 227, 245-272 (1991).
[3] Y. Fournier, J. Bonelle, C. Moulinec, Z. Shang, A. Sunderland, J. Uribe, Computers & Fluids, 45, 103-108 (2011).