ICHS-4, 12-15 Sept. 2011, San Francisco, USA A.G.Venetsanos 1, I. Tolias 1, D. Baraldi 7, S. Benz 5,...
-
Upload
jesse-watson -
Category
Documents
-
view
216 -
download
1
Transcript of ICHS-4, 12-15 Sept. 2011, San Francisco, USA A.G.Venetsanos 1, I. Tolias 1, D. Baraldi 7, S. Benz 5,...
ICHS-4, 12-15 Sept. 2011, San Francisco, USA
A.G.Venetsanos1, I. Tolias1, D. Baraldi7, S. Benz5, B. Cariteau2, J. Garcia3, O.R. Hansen4, C. Jäkel6, S. Ledin8, P. Middha4, E.A. Papanikolaou7
1 Environmental Research Laboratory, National Centre for Scientific Research Demokritos (NCSRD), 15310 Aghia Paraskevi, Attikis, Greece, [email protected] C.E.A. Saclay, D.E.N., D.M.2S., S.F.M.E., Laboratoire d’Etude Expérimentale des Fluides, 91191 Gif/Yvette cedex FRANCE3 Escuela Técnica Superior de Ingenieros Industriales, Universidad Politécnica de Madrid (UPM), José Gutiérrez Abascal, 2, E-28006 Madrid, Spain4 GEXCON AS, Fantoftvegen 38 Box 6015 Postterminalen N-5892 BERGEN Norway5 IKET, KIT, Postfach 3640, 76021 Karlsruhe, Germany6 Forschungszentrum Juelich (FZJ), 52425 Juelich, Germany7 Joint Research Centre of the European Commission (JRC), Institute for Energy, 1755 ZG Petten, The Netherlands8 Health and Safety Laboratory (HSL), Harpur Hill, Buxton, Derbyshire, SK17 9JN, UK
IA-HySafe Standard benchmark exercise SBEP-V21: Hydrogen release and accumulation within a non-ventilated ambient pressure garage at low release rates
ICHS-4, 12-15 Sept. 2011, San Francisco, USA
CONTENTS
Introduction & Scope Description of CEA Garage Test 5 Modelling strategy Results & discussion Conclusions
2
ICHS-4, 12-15 Sept. 2011, San Francisco, USA
Intro & Scope
The Research Committee activities of IA-HySafe include: the continuation of SBEPs first introduced within HySafe EC-NoE
SBEPs to validate, inter-compare and further develop existing
Computational Fluid Dynamics (CFD) codes and models in predicting hydrogen related release, dispersion and combustion phenomena
Focus in the present work: Understanding and prediction of the dispersion / accumulation
of hydrogen releases in confined spaces under low release conditions
3
ICHS-4, 12-15 Sept. 2011, San Francisco, USA
CEA Garage Test-5
4
Garage x-dimension (mm) 5760
Garage y-dimension (mm) 2960
Garage z-dimension (mm) 2420
x release (mm) -2880y release (mm) 1480z release (mm) 220
Exit diameter (mm) 29,7Volumetric flow rate - STP
(NL/min)18
He mass flow rate (g/s) 0,054
Garage Temperature T (°C) 24,1
Exit velocity (m/s) 0,47Release Direction Upwards
Release Type ContinuousRelease duration (s) 3740
Released volume - STP (NL) 1122
He released mass (gr) 200,28
Target concentration (%) 2,94%
Total measurement time (s) 90440
Re = 115
ICHS-4, 12-15 Sept. 2011, San Francisco, USA
Modelling strategy
5
Participant/
Code
Turbulence
model
Number of computational
cells
Convective terms
Transient terms
Vent model
Molecular diffusivity
(m2/s×10-5)
FZJ/CFX SAS-SST212272 (half
garage)2nd order
2nd order backwards
EulerOpening 8.0
GEXCON/FLACS
k-εRelease: 30888Diffusion: 4560
2nd order Opening 2.0
GEXCON_revised/FLACS
k-εRelease: 44352Diffusion: 7200
2nd order Extension 2.0
HSL/CFX SST 88840
High resolution
scheme (2nd order)
2nd order backwards
EulerOpening 1.86
JRC/CFX LaminarRelease: 101401Diffusion: 70429Outside: 5173
2nd order2nd order
backwards Euler
2 m × 3 m × 3 m
extension11.7
KIT/GASFLOW
k-ε 58905Upwind 1rst
orderALE scheme Opening 7.5
NCSRD/ADREA-
HFk-ε
53760Outside: 3360
SMART 3rd order
1rst order fully implicit
1 m × 2.96 m × 2.42 m extension
5.65
UPM/FLUENT
Laminar 125516 2nd order1rst order
fully implicitOpening 5.65
UPM_revised/
FLUENTLaminar -
1 m × 2.96 m × 2.42 m extension
5.65
ICHS-4, 12-15 Sept. 2011, San Francisco, USA
Results – Mass balance
6
ICHS-4, 12-15 Sept. 2011, San Francisco, USA
Results – CPU times
7
Participant/Code Compressibility Simulated period (s) CPU time Threads Computer type
FZJ/CFXFully
compressible20000 s 15d, 21h 3 Intel i7 860 CPU
GEXCON/FLACS
Low Mach 100000 s 1d 1Linux-PC, Intel Xeon
W3550, 3.07 GHzGEXCON_revi
sed/FLACS
Low Mach 20000 s 5.5h 4 Quad core
HSL/CFXFully
compressible
15000 s (coarse mesh) 12000 s
(fine)
18d, 5h (coarse) 19d,
15h (fine)2
Windows XP SP3 64-bit, 2 Intel Xeon
JRC/CFXFully
compressible15000 s 9d, 20h 8 3.25 GHz
KIT/GASFLOW
Low Mach 20000 2d, 15h 1Suse Linux 11.2, i7-
950, 3.06GHz
NCSRD/ADREA-HF
Fully compressible
7080 10d 2Windows 7, i7 M620
CPU at 2.67 GHz
UPM/FLUENT
Fully compressible
20000 13d 4Windows 7, 2 Intel
Xeon Quad Core CPUs at 2.4 GHz
ICHS-4, 12-15 Sept. 2011, San Francisco, USA
Results - Concentrations
8
Sensor name z (mm)P1N3 2370P1N2 2135P1N1 1900M1N5 1575M1N4 1260M1N3 945M1N2 630M1N1 315
ICHS-4, 12-15 Sept. 2011, San Francisco, USA
Results - Concentrations
9
P1N3, z = 2.37 m
ICHS-4, 12-15 Sept. 2011, San Francisco, USA
Results - Concentrations
10
P1N2, z = 2.135 m
ICHS-4, 12-15 Sept. 2011, San Francisco, USA
Results - Concentrations
11
P1N1, z = 1.9 m
ICHS-4, 12-15 Sept. 2011, San Francisco, USA
Results - Concentrations
12
M1N5, z = 1.575 m
ICHS-4, 12-15 Sept. 2011, San Francisco, USA
Results - Concentrations
13
M1N4, z = 1.26 m
ICHS-4, 12-15 Sept. 2011, San Francisco, USA
Results - Concentrations
14
M1N3, z = 0.945 m
ICHS-4, 12-15 Sept. 2011, San Francisco, USA
Results - Concentrations
15
M1N2, z = 0.63 m
ICHS-4, 12-15 Sept. 2011, San Francisco, USA
Results - Concentrations
16
M1N1, z = 0.315 m
ICHS-4, 12-15 Sept. 2011, San Francisco, USA
CONCLUSIONS
Relatively good predictions of He concentrations
Significant reduction in CPU time with low Mach number solvers
Significant effect of extending the computational domain far enough beyond the confined space opening.
ICHS-4, 12-15 Sept. 2011, San Francisco, USA
THANK YOU FOR YOUR ATTENTION
ANY QUESTIONS