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SILER International WorkshopItaly 18th 19th June
Sloshing effects in the LFR systems
G.Barrera*,P.Dinoi**,J.Cercs**,L.Gonzlez**,A.Guerrero***,F.Beltrn***, A.Moreno***
* CIEMAT** UPM-ETSIN
*** IDOM
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TABLE OF CONTENTS
OBJETIVES1
RESULTS4
MODELS3
METHODOLOGIES2
CONCLUSIONS5
PENDING WORK6
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RPV Fluid structure interaction for the LFR with seismicisolators
Maximum sloshing displacements
Maximum pressure loads Three approaches :
I. FLUENT : Include full 3D description of components
II. ABAQUS: Fluid structure interaction
III. SPH : Detailed description of the fluid displacements
OBJETIVES
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CFD : Computational Fluid Dynamics with FLUENT
Development of a detailed 3D model of the internal
components
Evaluation of fluid displacements
Pressures to be introduced in a second structural model withANSYS .
METHODOLOGIES:FLUENT/ANSYS
FULL 3D INTERNAL DETAILS
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STRUCTURES 3D GEOMETRY
METHODOLOGIES:FLUENT
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3D GEOMETRY DETAILS
METHODOLOGIES:FLUENT
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VOLUMENS: FLUID DOMAIN
METHODOLOGIES:FLUENT
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REACTOR VESSEL 3D
MODEL
METHODOLOGY : FLUENT
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ALE : Arbitrary Lagrangian Eulerian
Mesh does not follow fluid but it is remeshed to
fit new boundaries
Main feature: two meshes: fluid and structure
METHODOLOGIES : ABAQUS
FLUID STRUCTURE INTERACTION
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Nodes at the boundary cann ot leave the bou ndary
u Tracking of boundaries is Lagrangian
u After deformation of the boundaries: remeshing of internal domain
Eulerian material transport across the mesh
u Remeshing is done every 1-10 time steps, to avoid severe distortion
METHODOLOGIES:ABAQUS
ALE MESH
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METHODOLOGIES:ABAQUS
STRUCTURE VOLUMENS
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SPH: Smoothed Particle Hydrodynamics
AQUAAgpusph new software
Fluid is represented by a set of particles
Fluid properties are obtained by interpolation of property
at near particles
METHODOLOGIES:SPH
FLUID DESCRIPTION
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METHODOLOGIES:SPH
3D FLUID PARTICLES VOLUMEN
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SEISMIC INPUTS
0
10
20
30
40
50
60
70
80
0.1 1.0 10.0 100.0
PSA(m/s2)
Frequency (Hz)
Spectra - Horizontal accelerogram(X and Y directions)
AX- Case 01 - 7%
AX- Case 06 - 7%
AY- Case 01 - 7%
AY- Case 06 - 7%
0
20
40
60
80
100
120
140
160
0.1 1.0 10.0 100.0
PSA(m/s2)
Frequency (Hz)
Spectra - Vertical accelerogram(Z direction)
AZ- Case 07 - 7%
AZ- Case 06 - 7%
SEISMIC LOADS
RESULTS WITH FLUENT
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Componente horizontal de la
velocidad (m/s)
Componente vertical de la
velocidad (m/s)
Velocidad (m/s) Presin (Pa)
2D APPROACH:OPERATIONAL CONDITIONS
RESULTS WITH FLUENT
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RESULTS WITH FLUENT
REACTOR VESSEL
Free surface
Red : LeadBlue: Argon
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RESULTS WITH FLUENT
2D SLOSHING INTERNALS COMPONENTS
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RESULTS WITH FLUENT
3D SLOSHING INTERNALS COMPONENTS
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RESULTS WITH FLUENT
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RESULTS WITH FLUENT
3D SLOSHING INTERNAL COMPONENTS
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RESULTS WITH FLUENT
3D SLOSHING INTERNAL COMPONENTS
RESULTS WITH FLUENT
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RESULTS WITH FLUENT
RV PRESSSURES
Case 1
Time 7,6Pmax: 1,2 MPa
RESULTS WITH FLUENT
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RESULTS WITH FLUENT
RV DISPLACEMENTS& V.M. STRESSES
RESULTS WITH ABAQUS
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RESULTS WITH ABAQUS
3D SLOSHING AT VARIOUS TIMES
RESULTS WITH ABAQUS
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RESULTS WITH ABAQUS
CASE 6:LID CONTACT
RESULTS WITH ABAQUS
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RESULTS WITH ABAQUS
CASE 6:VERTICAL DISPLACMENTS
RESULTS WITH ABAQUS
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RESULTS WITH ABAQUS
-2
0
2
4
6
8
10
12
0 5 10 15
Pressure(M
Pa)
Time (s)
Reactor vesselMaximum pressure
Max. Pressure at the lower
point of the reactor vessel
CASE 6: RV PRESSURE
RESULTS WITH ABAQUS
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RESULTS WITH ABAQUS
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
0 5 10 15
R
elativedisplacement(
m)
Time (s)
Maximum relative vertical displacementSelected nodes from lead free surface
Node A
Node B
Node C
Node D
Node E
Node F
CASE 1: VERTICAL DISPLACEMENTS
RESULTS WITH ABAQUS
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RESULTS WITH ABAQUS
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0 5 10 15 20
Pressure(MPa)
Time (s)
Reactor vesselMaximum pressure
Maximum pressure at the reactor vessel
(point at half-height on XZ plane)
-1.0
-0.5
0.0
0.5
1.0
1.5
2.02.5
3.0
3.5
0 5 10 15 20
Pressure(MPa
)
Time (s)
Inner vesselMaximum pressure
Maximum pressure at the inner vessel
(point at half-height on XZ plane)
CASE 1: PRESSURES
RESULTS WITH SPH
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CASE 6: PRESSURES
0 AND 90
Peak: 60MPa, sensor 2
RESULTS WITH SPH
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CASE 6: PRESSURES
180 AND 270Peak 90 MPA
RESULTS WITH SPH
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RESULTS WITH SPH
-0.5
-0.4
-0.3
-0.2
-0.1
0.0
0 5 10 15
Maximumf
reesurfaceheight(m)
Time (s)Abaqus model
SPH model
RESULTS WITH SPH
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CASE 6: PRESSURE:Time 8 ss, 10MPa
0 AND 90
CALCULATION TIME
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CALCULATION TIME
CFD: 950000 Control Volumens 1 Month/Case
ALE: 68776 Finite Elements 75 Hours/Case
SPH: 800000 Particles 20 Hours/Case
RESULTS
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CONCLUSIONS
o A full knowledge of the 3D design is requiredo Significant internal components should be included in the model
o Seismic isolators reduce sloshing and maintain vertical behaviour
o Calculation time is an unsuitable issue
o Using and comparing the three approaches allow a betterunderstanding on the behaviour of main variables
o A full description of the displacements, velocities and pressures
is being obtained with all approaches
o
Very high fluid pressures are obtained for case 6: 90 Mpa inpact local load, sensor 2 on the lid
12 Mpa inpact load, sensor 6 vessel botton
PENDING WORKS
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PENDING WORKS
Simulation with the full geometry is being doing Optimization of the calculation time
Obtaing design results loads for vessel and
internals. Check pressure and displacements
Evaluation of the coupled fluid structure interaction
effects. Comparative analysis of the results from the three
approaches.