1 - THMT 6, H&FF Simulations for energies Models

2 - THMT 6, H&FF Simulations for energies

3 - THMT 6, H&FF Simulations for energies Models

4 - THMT 6, H&FF Simulations for energies Models: elliptic relaxation / V2F More robust version developed: (Lien, Durbin, Manceau, Hanjalic, Uribe …) Now in industrial codes and shown more reliable for heat transfer case

5 - THMT 6, H&FF Simulations for energies Models: k-omega

6 - THMT 6, H&FF Simulations for energies Models: k-eps / k – omega blending

7 - THMT 6, H&FF Simulations for energies Models: SST

8 - THMT 6, H&FF Simulations for energies Models: 2 nd moment closure / RE stress transport

9 - THMT 6, H&FF Simulations for energies Models

10 - THMT 6, H&FF Simulations for energies Models

11 - THMT 6, H&FF Simulations for energies Code_Saturne: main capabilities Physical modelling Single-phase laminar and turbulent flows: k- , k-  SST, v2f, RSM, LES Radiative heat transfer (DOM, P-1) Combustion coal, fuel, gas (EBU, pdf, LWP) Electric arc and Joule effect Lagrangian module for dispersed particle tracking Compressible flow ALE method for deformable meshes Conjugate heat transfer (Syrthes & 1D) Specific engineering modules for nuclear waste surface storage and cooling towers Derived version for atmospheric flows ( Mercure_Saturne ) Derived version for eulerian multiphase flows Flexibility Portability (UNIX and Linux) GUI (Python TkTix, Xml format) Parallel on distributed memory machines Periodic boundaries (parallel, arbitrary interfaces) Wide range of unstructured meshes with arbitrary interfaces Code coupling capabilities ( Code_Saturne/Code_Saturne, Code_Saturne/Code_Aster,...)

12 - THMT 6, H&FF Simulations for energies Code Saturne & HPC - Unstructured meshes handle multiscale problems - Efficient parallel computing PWR lower plenum decomposition (Metis)

13 - THMT 6, H&FF Simulations for energies Validation Academic and industrial test-cases

14 - THMT 6, H&FF Simulations for energies Qualification for nuclear thermal-hydraulics Quality and trust important for nuclear safety Code_Saturne used for calculations presented to Nuclear Authorities Complements standard validation for a specific domain of application comparing to reliable data determining the limitations of the results edicting best practice guidelines temperature

15 - THMT 6, H&FF Simulations for energies Conclusions –LES in power generation industry LES of Industrial flow Much more information: Fluct. thermal stresses, fatigue, acoustics, FIV Cost-wise accessible when limited to sub-domain (synthetic turbulence) Complex geometry possibly easier than smooth channel flow Exploit better flexibility of professional/commercial software: Opens new range of applications for LES More meshing control (total cell size control from pre-simulation) (Greater breakthrough than elaborate SGS models? ) High Re : RANS – LES coupling, embedded LES Cross-discipline research: Fluids / Structure-Mech/ Materials ? Cracks, Thermal stripping, ageing, corrosion

16 - THMT 6, H&FF Simulations for energies Trust & Quality in LES serious issue: - 99% LES are “ post-dictions ”, or “ explanations ” - how many failed LES / no. of published LES ? (ex. 2D Hill, Ahmed body.. - errors can be much larger than in RANS - can we design next gen nuclear power plants using LES? - mesh influence tremendous, but turbulence scales not known a priori - a posteriori quality criteria known (see Q-LES workshop B. Geurts) but trial and error most expensive with LES - do not venture outside pipe/channel flow applications? - or COLLABORATIVE work on validations in new areas on a large scale (i.e. reporting failures is very important)