33_moreno_sloshing effects in lfr systems

7/29/2019 33_Moreno_Sloshing Effects in LFR Systems

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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



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VOLUMENS: FLUID DOMAIN



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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.

33_moreno_sloshing effects in lfr systems

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