Ship impact simulation on a rolling lock gate

Ship impact simulation on a rolling lock gate New Lock Terneuzen

Ship impact simulation on a rolling lock gate New Lock Terneuzen

Content • Ingenieursbureau Boorsma – History & general information

• Ship impact simulation – Project New Lock Terneuzen – Ship impact simulation • Workflow & boundary conditions • Analysis • Results – Conclusions on ANSYS Workbench & LS-DYNA ACT 14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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History & general information • Ingenieursbureau Boorsma BV – In 1969 ir. K. Boorsma settles as an independent consulting engineer

• Present: – Current management: ir. J. Wessels – 50 employees – Offices in Drachten and Amersfoort

14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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Workfield • Branches – Structural Design & Civil engineering – Environment & Geology

• Disciplines – – – – – –

Infrastructure & Hydraulic Engineering Building Engineering Construction management Timber-frame housing Environmental and Geology advice Building physics

14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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Hydraulic Engineering & (railway) infrastructure Locks and weirs

Lock at Heumen 14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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Hydraulic Engineering & (railway) infrastructure HSL-fly-over (Rotterdam)

Metro station Rotterdam Central Station - Randstadrail 14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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Projectmanagement en Engineering Buildings

New building IKEA Zwolle Special feature: sustainability; solar panels on the roof

Rebuilding IKEA Utrecht Special feature: new sport accommodation for the surrounding city district

14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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Ship impact simulation on a rolling lock gate New Lock Terneuzen

Blue Roads Europe

14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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Blue Roads Europe Channel Gent-Terneuzen

14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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Blue Roads Europe Channel Gent-Terneuzen

14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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Projectorganisation

14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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New Lock Terneuzen

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14-10-2016 | ANSYS ConvergencePagina 15

Assumptions • Shiptype – Mass – Length – Draft – Width – Velocity – Energy

Handysize bulkcarriers (single screw) 35.000 tons 230 m 12,5 m 32 m 2 knots (1,028 m/s)

Due to the water mass that moves along

14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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Goals of the crash simulation Judgment of: •

Deformations – Can the gate roll back into the chamber after a crash?

(The doorway in the concrete lockchamber has a 50 mm tolerance)

•

Force reactions – Will the supporting structures and watertight sealing around the door be damaged?

(Damage to parts casted in concrete is not desirable)

•

Dimension of cracks – Will the size of the crack not be too large?

(Rolling the gate through running water due to the leakage is limited)

•

Buoyancy tanks (stability & floating capacity) – Will the length of the buoyancy tank that gets damaged exceed the maximum of 9 m?

(Minimum length to generate floating capacity enough to roll the gate) 14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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The Workflow that is used for the finite element simulations

LS-PrePost

14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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TEKLA Structures model

14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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ANSYS SPACECLAIM is used for modeling the gate construction geometry

14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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An STL file of a cargo ship is used for the ship’s bulb and bow geometry

14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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The Workflow that is used in ANSYS Workbench Geometry

Steel quality defined in the Engineering Data

Mode shapes

Results of the implicit analysis used as a starting point for the explicit analysis

Crash Analysis in LSDYNA ACT Extension

Earth Gravity & Water pressures

14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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The Finite Element Mesh of the gate and the ship’s bow Gate: elem size between 35 - 450 mm Ship’s bow: elem size between 60 - 1000 mm In Total: 307.148 nodes and 303.645 elements

14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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Boundary Conditions used in the analysis

Upper roll carriage (UZ)

Horizontal and vertical supports at the gate (UX, ROTY, ROTZ)

Lower roll carriage (UZ) 14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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Overview of the loads that were taken into account

Ship’s bow is rigid with an initial velocity of 1.03 m/s (2 knots)

14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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The hydrostatic pressure loads acting on the gate’s damming side

Hydrostatic water pressures at the water retaining sheet

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Three critical situations are analyzed A. Impact of the bulb right in the middle of the gate and the air box • This will result in the largest crack B. Impact of the bulb at an upper in- between baffle of the air box (out of the middle of the gate) • This will result in the largest forces acting on the supporting construction C. Impact of the ship’s bow out of the middle of the gate • This will result in the largest deformations 14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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Results Postprocessing with LS-PrePost Kinetic Energy, Displacement, Velocity and Acceleration over time

14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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Displacement Results in [mm]

Resulting displacements for t = 6 s

Resulting displacements for t = 0 s

14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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Von Mises Stress Results in [MPa]

14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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Von Mises Stress Results in [MPa]

14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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Plastic Strain [-]

14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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Results: Element Force vectors acting on the damming plate stiffeners

HEB 1000 stiffeners at the water damming plates of the lock gate Force vector plot created in LS-PrePost 14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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Results: Impact loadcurves for the 3 simulations Impact loading vs Time 35,00

Force Loading [MN]

30,00 25,00 20,00 15,00 10,00

Simulation

A

Simulation

B

Simulation

C

5,00 0,00 0

1

2

3

4

5

6

7

8

Time of the impact [s]

Force-Deflection curve Force loading [MN]

35,00 30,00

25,00 20,00

Simulation

A

15,00

Simulation

B

10,00

Simulation C

5,00 0,00 0,00 0,25 0,50 0,75 1,00 1,25 1,50 1,75 2,00 2,25

Deflection [m] 14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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2,50

2,75 3,00 3,25 3,50

Animated Results Animated Results

14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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Ship impact on a lock gate is not a hypothetical case‌

14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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Some Concluding Remarks…

• Workbench LS-DYNA ACT Extension is a great simulation tool for explicit dynamic analyses • Short learning curve for engineers who are already familiar with the Mechanical Interface • Result postprocessing works very easy and smoothly in LS-PrePost, especially the creation of graphs

14-10-2016 | ANSYS Convergence Conference | Ship impact simulation on a rolling lock gate

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Feel free to contact us for more information: Ir. Anne Jan Breimer Lead Engineer & Project Manager a.j.breimer@boorsma-consultants.nl linkedin.com/in/anne-jan-breimer

Ir. T. Hoekstra Structural Engineer & FEM Specialist t.hoekstra@boorsma-consultants.nl linkedin.com/in/tunishoekstra

A: T: F: E: W: :

Gerben Sondermanstraat 2 9203 PV Drachten +31(0)512 580 300 +31(0)512 525 296 drachten@boorsma-consultants.nl http://www.boorsma-consultants.nl @IB_Boorsma

B.V. Ingenieursbureau Ir. K. Boorsma KvK (Leeuwarden) 01042375