OpenFOAM Modeling of Tsunami Forces on Coastal...
Transcript of OpenFOAM Modeling of Tsunami Forces on Coastal...
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OpenFOAM Modeling of Tsunami Forces on Coastal Structures
Michael Motley Randy LeVeque Frank Gonzalez Marc Eberhad
Xinsheng Qin Andrew Winter Hin Kei Wong
PEER Annual Meeting 28 January 2016
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Multi-Scale Modeling of Tsunami Forces
Community-Scale Inundation and Force
Prediction
Structure-Scale Force Prediction
Detailed structural models provide insight into the dynamic fluid forces that a structure may experience to permit
capacity analysis
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Computational Fluid Dynamics Modeling
OpenFOAM: Open Field Operation and Manipulation
Purposely developed for solving a wide range of fluid problems Incompressible flows, multiphase flows, buoyancy-driven flows, and
more
Complete CFD software package Comes with 80+ solvers and 170+ utilities
Mesh Generations and Refinements
Data loaders for converting CAD geometries to meshes
Parallelization of fluid problem solutions
In this work, 64-256 processors were commonly used
Other researchers have used up to ~1000 processors
Will be available for use on NHERI Cyberinfrastructure in the coming months
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Computational Fluid Dynamics Modeling We convert CAD *.stl files into OpenFOAM 3D Meshes
CAD Rendering OpenFOAM Internal Mesh OpenFOAM Boundary Faces
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Computational Fluid Dynamics Modeling We convert CAD *.stl files into OpenFOAM 3D Meshes
CAD Rendering OpenFOAM Internal Mesh OpenFOAM Boundary Faces
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Computational Fluid Dynamics Modeling We convert CAD *.stl files into OpenFOAM 3D Meshes
CAD Rendering OpenFOAM Internal Mesh OpenFOAM Boundary Faces
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Computational Fluid Dynamics Modeling We convert CAD *.stl files into OpenFOAM 3D Meshes
CAD Rendering OpenFOAM Internal Mesh OpenFOAM Boundary Faces
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Experimental Data from Flume Tests
2D 3D
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By slightly modifying the geometry of the bridge, we can create scenarios where extrapolating a two-dimensional model does not accurately represent the response of the structure to wave loads.
Consider a skewed bridge:
Modifying the Geometry
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Resulting Loading Histories
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What about slope effects?
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Fluid-air-structure interactions
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14.5 15 15.5 16 16.5 17 17.5 18 18.5 19
0
100
200
300
400
500
Time, t (sec)
Ho
rizo
nta
l F
orc
e, F
x (
kN)
Total vs. Component Responses
Fluid-air-structure interactions
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Fluid-air-structure interactions
14.5 15 15.5 16 16.5 17 17.5 18 18.5 19-800
-600
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-200
0
200
400
600
Time, t (sec)
Ho
rizo
nta
l F
orc
e, F
x (
kN)
Total vs. Component Responses
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Structure-Scale Models
14.95 15 15.05 15.1 15.15 15.2 15.25 15.3 15.35
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0
200
400
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Time, t (sec)
Hor
izon
tal
Forc
e, F
x (k
N)
Total vs. Component Responses
Front Faces at 15.25 s Front Bay at 15.35 s
Approximately equal and opposite contributions from back face of girder 1 and front face of girder 2
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Structure-Scale Models
15.45 15.5 15.55 15.6 15.65 15.7
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0
100
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Time, t (sec)
Hor
izon
tal
Forc
e, F
x (k
N)
Total vs. Component Responses
Front Faces at 15.45 sec Bays and Front Barrier at 15.625 s
back face of girder 1 front face of girder 2
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Structure-Scale Models
15.45 15.5 15.55 15.6 15.65 15.7
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0
100
200
300
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Time, t (sec)
Hor
izon
tal
Forc
e, F
x (k
N)
Total vs. Component Responses
Front Faces at 15.45 sec Bays and Front Barrier at 15.625 s
back face of girder 2 front face of girder 3
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Structure-Scale Models
15 15.5 16 16.5 17 17.5 18 18.5 19
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1000
Time, t (sec)
Ver
tical
For
ce, F
y (k
N)
Total vs. Component Responses
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Structure-Scale Models
15 15.1 15.2 15.3 15.4 15.5 15.6 15.7 15.8
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200
400
600
800
1000
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Time, t (sec)
Ver
tical
For
ce, F
y (k
N)
Total vs. Component Responses
Deck Impact at 15.25 s Internal Deck Impact at 15.65 s
Largest peaks occur on deck bottom and coincide with equal and opposite spikes in horizontal load, implying air effects, as do many of the minor peaks
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OpenSees/OpenFOAM Model Overview
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OpenSees/OpenFOAM Model Overview
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OpenSees/OpenFOAM Model Overview
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Earthquake/Tsunami Response