numerical offshore tank - details

Numerical Offshore Tank TPN

November | 2011

Introduction

•TPN is a research laboratory specialized in linking academic knowledge and ships and offshore industry needs.

•Numerical and experimental work developed by over 40 people and spin-off companies in:

•Model testing. •Ships and offshore hydrodynamics and stability. •Risers and mooring. •Manoeuvring and DP. •Offshore operations and installations. •Development of in-house analysis software. •3D visualization. •Simulations.

Infrastructure

Cluster 1: 192 blades with 192x8 cores and 15 TFlops Cluster 2: 16 servers GPU with 30 TFlops

Hydrodynamic Calibrator (CH)

4D Visualization Room

Facilities

Hydrodynamic Calibrator – Wave

Basin

CH-TPN

Wave Basin – Objective

•Hydrodynamic Calibrator.

•Hybrid investigation model (numerical/experimental).

•Research on wave generation and absorption.

Wave Basin – Description

•Dimensions: 14 x 14 meters and 4.1 meters depth.

•148 flap type wave boards distributed in 4 sides.

•Maximum wave height of 0.4 meter.

•Wave frequency range of 0.5 to 2.0 Hz.

•Designed to generate regular, irregular and transient

waves.

•Active absorption up to 93% for regular waves.

•Generation and absortion performed by the 4 basin sides

CH-TPN

Instrumentation

•Carriage for instrumentation and dynamic actuators support

•Qualisys optical system to capture model motions •4 cameras In-air and 3 underwater

•16 capacitives and 148 ultrasonic wave probes attached to the flaps

CH-TPN

Ships and Oil Platform Models

1 2

3 4

•Model in scale may be constructed in IPT (State of São Paulo Research Institute)

Research Topics

TPN Numerical Simulator

•In-house code for analysis of offshore

systems.

•Framework for different tools

•Ex: Wamit, FEM-ANFLEX, FEM-

Preadyn etc.

•Integrates hydrodynamic, mooring and

riser, VIV, VIM and DP analysis.

•Calibration with experimental results

from the Hydrodynamic Calibrator.

•Simulation of multibody and real scale

structures.

TPN Real Time Simulator

•Adapted from the original TPN software.

•Allows real time simulations of inland and

offshore systems.

•Together with graphical user interface

produces virtual reality training consoles.

Visualization of Results

•Post-processing of results calculated in TPN softwares.

•3D and virtual reality – TPNView – In-house software.

Runup/Air Gap

Wave Run-up Effects on Semi-Sub Columns

•Fundamental model tests.

•Numerical evaluation of the phenomena

•Potential Theory – WAMIT.

•Viscous Theory – CFD ComFLOW.

•Definition of a Design Methodology Procedure.

Ship resistance using RANSE and VOF approach

VOF - Fraction model – StarCCM+

• NPL Series Hull. • Coupled viscous and potential effects.

Simulation conditions

• High speed vessel – Fn=0.4. • Model scale - Reynolds 106.

• Fixed – no trim or sinkage.

Moving-Particle Semi-implicit (MPS)

• In-house development.

• Free surface.

• Complex geometry.

• Multibodies.

• Large displacements.

• Large deformations.

• Moving boundaries.

• Fragmentation and merging.

• Multiphase and Multiphysics.

• Propellers.

Dam breaking (MPS method)

Oil leakage

Water flooding

Flow in porous media

Propeller using panel method

• Comparison between numerical and regression results.

• Potential flow.

• Viscous corrections.

• Lifting line code – in-house.

• Lifting surface code – in-house.

• PPB-HSVA.

2D/3D Time domain BEM for seakeeping Analysis

• In house development.

• Calculation hydrodynamic coefficients and motions in surface waves.

2D 3D

Numerical wave tank simulator of CH-TPN

•CH Numerical Simulator.

•148 Numerical Flaps.

•Time-Domain Boundary Elements

Method.

•Allows to test the algorithms

developed for wave generation and

active absorption.

Vortex-Induced Vibrations

•Fluid-structure interaction.

•Development of CFD code together with

MARIN - ReFRESCO.

•VIV of risers with CFD.

•Semi-empirical model – TPN software.

Vortex-Induced Motions

• The motivation is the low aspect ratio of offshore platforms, as spar and monocolumns.

• Combined experimental and numerical approaches for understanding and prediction of VIM.

• Numerical model implemented in TPN software.

0 2 4 6 8 10 12 140

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

Reduced Velocity (Vr)

Ay /

(

D)

L / D = 2.00

L / D = 1.50

L / D = 1.00

L / D = 0.75

L / D = 0.50

L / D = 0.40

L / D = 0.30

L

D

0 2 4 6 8 10 12 14 160

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

AY / D

Vr0 = UT

0 / D

L/D = 0.10

L/D = 0.20

L/D = 0.30

L/D = 0.40

L/D = 0.50

L/D = 0.75

L/D = 1.00

L/D = 1.50

Gonçalves et al. (2010)L/D = 0.21

Gonçalves et al. (2010)L/D = 0.39

Experiments Numerical

Conceptual Designs

• Design of the Mooring and Tendons

systems.

• Design of the TLWP.

• Supervise the model tests performed

at NMRI (Japan).

• Hydrodynamic (shadow and 2nd order

effects).

• Stability analysis .

• Structural analysis.

Dry Tree Completion FPSO-TLWP Coupled System

• Design of a Monocolumn hull with an optimized

Hydrodynamic behavior in waves.

• Capacity to hold rigid risers.

• Design of Mooring and Risers for Hurricane Conditions

of the Gulf of Mexico.

• Clashing Analysis.

MonoGoM – BR America

Analyses and Simulations

Parametric Seakeeping Analysis

Experimental Numerical MPSO Design: Wave Exciting Forces and Moments •27 different model geometries. •Monitouring of Wave exciting forces and moments. •Numerical X Experimental Comparison.

• Tests at different basins (IPT-Brazil and NMRI-Japan) and with different setups.

• Evaluate MonoGoM concept in terms of VIM.

• Different responses due to: – Basin dimensions.

– Model scale.

– Springs setup.

– Reynolds number.

Mooring Line

SEincidence

UX

Y

3

4

Mooring Line

UX

Y 12

3

4

NWincidence

Mooring Line

0 degreeincidence

180 degreeincidence

U UX

Y3

1

2

MPSO

Spring

Spring

Wire

CCD camera

Spring

1 2

3 4

IPT (Brazil)

NMRI (Japan)

0.5

1

1.5

2

30

210

60

240

90

270

120

300

150

330

180 0

VIM –MonoGoM Platform

VIM on Semi-Sub

• VIM model tests performed at IPT towing tank.

• Reduced scale 1:100.

• 8 different headings (0 up to 180 degrees).

• 6 degrees-of-freedom measured using optical system.

• Forces measurements in mooring lines.

• The main effects studied: – Hull appendages.

– External damping.

– Draft condition.

– Concomitant presence of waves and currents.

• Risk Analyses about a possible of collision

during the offloading operation, between

FPSO POLVO and a jack-up located at 1706

meters of distance.

Offloading FPSO Polvo

• The FPSO POLVO is equipped in a Turret

configuration.

• The offloading system is composed by a

shuttle SUEZMAX tanker and a tug boat.

•Comparison between the BR rules and

TPN analysis to installation of a

manifold.

•Orange curve = BR rule.

•Green curve = TPN prediction of

operational window.

DP – BGL1 – P55

5 cm

5 cm

• Two vessels support the equipment to be launched.

• The relative positions and cable length can be controlled.

• TPN analyses:

• Damping coefficients evaluation

• Model Tests.

• Motion imposed in the launching cable.

• Numerical model calibration.

• Evaluation of the cable tension and manifold position in the TPN.

Y subsea launching method

TPN Numerical Model

Model Test in CH-TPN

SWATH

• Seakeeping evaluation.

• Comparison between a Slice

and a Swath hull concerning

motions and accelerations.

• Sickness evaluation

Regasefication Terminal BA

• Design of Mooring and fenders system.

• Hydrodynamic (shadow, shallow water and 2nd order effects).

• 3D movies and animations.

Stability Analysis

• Activities: • Modeling of vessels in CAD software. • SSTAB – Stability Analysis Software. • Intact and damage stability analysis.

Ship Interaction

-2 -1.5 -1 -0.5 0 0.5 1 1.5 2-0.15

-0.1

-0.05

0

0.05

0.1

0.15

0.2

x/L

Fy/

(0.5

L

T V

2)

Simulação calado 0.186m, distância 0.43m, velocidade 0.594 m/s

Método de faixas

Rankine - 3D

Ensaio - sinal original

-2 -1.5 -1 -0.5 0 0.5 1 1.5 2-0.06

-0.04

-0.02

0

0.02

0.04

0.06

0.08

x/L

Fx/(

0.5

L

T V

2)

Simulação calado 0.186m, distância 0.86m, velocidade 0.594 m/s

Método de faixas

Rankine - 3D

Ensaio - sinal original

Forces involved in a moored and passing ship interaction.

-1.5-1

-0.50

0.51

1.52

2.53

3.5

-1.5

-1

-0.5

0

0.5

1

1.5

2

2.5

-0.2

-0.1

0

Inner water navigation

• Development of a simulator for training towboats captains.

• Reproducing critical points of the river like bridge crossing, shallow or narrow passages as well as hard curves.

• The dynamic of the fleet of barges plus the towboat was solved applying the TPN software, adapted to a real time inputs and solution .

• The hydro and aerodynamic coefficients were obtained using CFD and validated by experimental data.

• The simulator reproduced the interior of a towboat.

• Verify the interference between ships.

• Size the height of the cranes.

• Verify the boom interference between the Panamax and Capesize.

35

Moatize

Torpedo Pile

• Torpedo pile monitoring system: analysis and improvement.

• Hardware evaluation (MEMS based inertial measurement sensors).

• Data treatment.

• Trajectory reconstruction algorithms.

Thank You