Transcript 00c-THMT-JPC-DL-09-09-09-annexes.ppt

Models
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Models
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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
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Models: k-omega
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Models: k-eps / k – omega blending
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Models: SST
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Models: 2nd moment closure / RE stress transport
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Models
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Models
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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, ...)
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Code Saturne & HPC
- Unstructured meshes handle
multiscale problems
- Efficient parallel computing
PWR lower
plenum
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Simulations for energies
decomposition
(Metis)
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Wake of a circular cylinder
2
U
Lid driven cavity
2
S
Channel flow Re*=1655
1&3 S
Dune
2
S
Asymmetric diffuser
2
S
Tube bundle (Fedora)
2
S
Head losses
2
S
180° circular tube bend
3
S
Simplified car body
3
S
Homogeneous Isotropic Turbulence
3
U
Mixed convection
2
S
Betts' cavity (natural convection)
2
S
Impinging jet
2axi
S
Jet in pool with thermal fluctuations
2axi
S
Stratified flow in pipe (Supernimbus)
3
S
Multi species mixing in pipe (Echo)
3
S
Thermal mixing zone (Rra)
3
S
Thermal shock (Creare)
3
U
Premixed flame (Oracles)
2
S
Diffusion flame
2axi
S
Coal combustion (Cerchar)
3
S
2-phase flow jet (lagrangian)
2axi
S
Shock tube
1
U
Axisymmetric arc (Pfender)
2axi & 3S
Radiative heat transfer (Selçuk)
3
S
Syrthes coupling
2
S
Foo
3
S
MED format
3
2-phase flow, lagragian (Hishida)
2a et 3 S
Reverse hot jet (mixed convection)
2
S
Oscillating channel
2
U
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Laminar/
Turbulent
Steady/
Unsteady
Dimension
Case
N°
Validation
Academic and industrial test-cases
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L
T
T
T
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T
T
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T
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T
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T
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T
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
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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
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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)
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