CFD Applications for Deepwater Platforms at Technip

Speaker: Allan Magee, PhDR&D Manager Offshore Product Line & Technology, Technip Malaysia Technip Chaired Professor in Offshore Technology, UTP Dept of Civil Engineering

CD-Adapco STAR South East Asian ConferenceCD Adapco STAR South East Asian Conference 5-6 Nov 2012

Table of Contents

Technip Introduction p

R&D on Floating Platforms

Early CFD ApplicationsEarly CFD Applications

Design of Floating Platforms for Southeast Asia

Riser VIV Suppression

Ringing of Offshore Platform

Future Work

Conclusions

2

Technip TodayWith engineering, technologies and project management, on land and at sea, we safely and

successfully deliver the best solutions for our clients in the energy business

Worldwide presence with 32,000 people in 48 countries

Industrial assets on all continents a fleet of 34 vessels (of which 5 under construction)Industrial assets on all continents, a fleet of 34 vessels (of which 5 under construction)

2011 revenue: €6.8 billion

Energy is at the core of TechnipTechnip Slide Library3

Three Business Segments, One Technip

Engineering and fabrication ofDesign manufacture and supply of Gas treatment and liquefaction

Subsea Offshore OnshoreEngineering and fabrication of fixed platforms for shallow waters (TPG 500, Unideck®)

Engineering and fabrication of floating platforms for deep waters (Spar semi-submersible

Design, manufacture and supply of deepwater flexible and rigid pipelines, umbilicals and riser systems

Subsea construction, pipeline installation services and Heavy Lift

Gas treatment and liquefaction (LNG), Gas-to-Liquids (GTL)

Oil refining (refining, hydrogen and sulphur units)

Onshore pipelines(Spar, semi-submersible platforms, FPSO)

Leadership in floatover technology

Floating Liquefied Natural Gas (FLNG)

installation services and Heavy Lift

Six state-of-the-art flexible pipe and / or umbilical manufacturing plants

Five spoolbases for reeled pipeline bl ll f l i i

Petrochemicals (ethylene, aromatics, olefins, polymers, fertilizers)

Process technologies (proprietary or through alliances)

Construction yardassembly as well as four logistic bases

A constantly evolving fleet strategically deployed in the world's major offshore markets

or through alliances)

Biofuel and renewable energies (including offshore wind)

Non-oil activities (principally in life sciences, metals & mining,

t ti )

Technip

Slide Librar

y

4

construction)

The best solutions across the value chain

Technip in Asia Pacific

A long-standing presence in Malaysia since 1982

Nearly 4 400 peopleNearly 4,400 people

Assets in the RegionAsiaflex Products: flexible pipe & umbilical manufacturing plant – 1st and only one in Asia Bangkok

Shanghai

Logistics base in BatamFuture new vessel, Deep Orient (under construction): flexible & umbilical pipelaying vesselFabrication yard: TMB

Kuala Lumpur Tanjung Langsat

JakartaSingapore Balikpapan

Batam

Hull design: TMH

Main expertiseDeepwater subsea developmentsOffshore platform & field development

Perth

New Plymouth

Offshore platform & field developmentOnshore facilities for oil refining, gas processing/liquefaction (LNG), petrochemicals and non-oil industries

Regional Headquarters

Operating centers

Flexible pipe/umbilical plant

Logistic BaseConstruction Yard

5 Technip Slide Library

Table of Contents

Technip Introduction p

R&D on Floating Platforms

Early CFD ApplicationsEarly CFD Applications

Design of Floating Platforms for Southeast Asia

Riser VIV Suppression

Ringing of Offshore Platform

Future Work

Conclusions

6

Who We AreOffshore Product Line & TechnologyOPL&T at Technip MalaysiaOPL&T at Technip Malaysia

Part of a broad Technip R&D effort to complement the Centers inHouston and ParisBranch in Kuala Lumpur since 2008/2009Branch in Kuala Lumpur since 2008/2009Purpose: Bring R&D closer to the regionMain Focus areas: Regional floating platform technologies

Floatover InstallationsModel testing at local facilitiesNumerical wave tank with Computational Fluid Dynamics

VIM of multi-column floaters (SEMI, TLP)( , )Fluid-Structure Interaction (FSI)

Links to other centers forTechnology gapsCoordinationCoordinationTraining

Why Computational Fluid Dynamics?Provide design assurance using the most accurate tool for first of a kind offshore structuresBest available estimatesof hydrodynamic loadsCorrelation with other modelsExtrapolation to fullscale Re. No.Quicker than a model testProvides more information

Complements/completes test dataComplements/completes test data

Able to remove simplifying assumptions inherent in other theories Yet retain these results as special cases

Unsteady effects included (not constant added mass/drag coefficients)y ( g )Large volume structure (diffraction included - not slender members)Separated flow for bluff bodies (not potential flow) Non-linear free surface (not linear theory)

Run-up/ Air gapRun up/ Air gapSteep and breaking waves

Pressure mapping onto dynamic structural model (SACS mode shapes)Load mapping onto ANSYS modes (ongoing w/ TP Houston)T t t f h d t ti t ti d d i l d APITreatment of hydrostatic, static wave and dynamic loads per API

Get structures+ Hydro guys to talk the same language

Floating Production Platform Overview► A Floating Production Platform is a complex, 

integrated system :

• Topsides– Process Plant

– Drilling/Work over Rig

– Living Quarter

– Marine Systems– Marine Systems

– Safety Equipment

• Hull– Buoyancy to carry Topside, Moorings and Risers

Heave Platesy y y p , g

– Stability to avoid capsizing

– Motions to perform Drilling and Processing

– Support and Protect the Risers

Plates

• Moorings– Station Keeping

• Risers

9

– Controlled transport of Hydrocarbons from Reservoir to Process Plant (import) then to Pipeline or Tanker (export)

Table of Contents

Technip Introduction Sea surface

p

R&D on Floating Platforms

Early CFD ApplicationsSeachest

CenterwellEarly CFD Applications

Design of Floating Platforms for Southeast Asia

Deck 3Plate

Centerwellsea surface

for Southeast Asia

Riser VIV Suppression

Ri i f Off h Pl tf

Heaveplate Hull

Ringing of Offshore Platform

Future Work

10

Conclusions

CFD Application: Heave Plates with skirtsI ti ffi i t f i ki t fi ti

Flat Plate

Inertia coefficients for various skirt configurations

0.8

0.9

1

a

0.5

0.6

0.7

0.0 0.2 0.4 0.6 0.8 1.0 1.2

Ca

Skirt Away

c/a

b/a = 0.23 b/a = 0.13 no skirt

Drag coefficients for various skirt configurations

7

8

9

10C

d

Skirt at Edge 4

5

6

0.0 0.2 0.4 0.6 0.8 1.0 1.2

c/a

11

/

b/a = 0.23 b/a = 0.13 no skirt

Design of Floating Platforms for Southeast AsiaSoutheast Asia

12

Unsteady Flow around a TLP Hull using Star CCM+

Background on Vortex-Induced Vibrations (VIV)

Cylinder in a current develops unsteady, alternating vortex pattern in wakeThe alternating vortices give rise to lift forces, perpendicular to currentIf vortex shedding period, Ts, approaches the natural vibration period, T, g p pp pof lateral motion, lock-in occursAmplitude of the motion A, is normalized by cylinder diameter DFor VIV due to currents at speed U, the most important parameter is the p , p preduced velocity

For large mass ratios (flagpole in the wind)D

UTUr =

g ( gp )the cylinder “locks-out” for 5<Ur>7

A/D

K V t St t b hi d fi d li d (Wiki di )

13Model Testing of Floating Platforms at UTM

Karman Vortex Street behind a fixed cylinder (Wikipedia)Animation of the phenomenon. Courtesy, Cesareo de La Rosa Siqueira.

From Flow Induced Vibrations, R.D Blevins,1990Ur

Solver Benchmarking: Model Scale Spar VIMAtluri et al, OMAE 2006Atluri et al, OMAE 2006

150 deg Heading

0 50

0.35

0.40

0.45

0.50ExperimentSimplif ied (AS)Simplif ied Appendages (AS)Full (AS)Simplif ied (AN)Full (AN)

0.15

0.20

0.25

0.30R

MS

A/D

( )

0.00

0.05

0.10

4 5 6 7 8 9 10

Reduced Velocity (Vrn)

14

ObjectiveExtend existing CFD capabilities for Spar VIM prediction to multi-

l l tf h TLP d SEMIcolumn platforms such as TLP and SEMI

15

TLP Model Towed to Simulate CurrentsMeasure Vortex-Induced Motions

16

Vortex-Induced Motions (VIM) of a TLP in Steady Current using Star CCM+

Calculations Using Star CCM+

Physics model: Incompressible Navier-Stokes(Air/water Volume of Fluid with free surface)Turbulence models: RANS and Spalart-Almaras / Detached Eddy Simulation (SA/DES)(SA/DES)Eulerian, body-fixed grid6-DOF coupled rigid body motions (DFBI)Domain size: 4m x 4m x 6m (Width x Depth x Length)Domain size: 4m x 4m x 6m (Width x Depth x Length)Mesh: Approx. 500,000 hexahedral cells (trimmer mesh)Max cell size: 0.5mMin cell size: 0.0025mTarget cell size on TLP: 0.0125mNo. of prism boundary layers: 4Total thickness of prism layer: 0.015mp yTime step: 0.01s, Implicit, 2nd order accuracy5 sub-iterations per timestepCalculations performed at model scale (1:70)

Mesh

Figure 10. Horizontal and vertical mesh slicesshowing the distribution of elements near the TLP model.

Calculated Sway Motions Using Star CCM+

0 10.20.30.4

A/D

)

0 511.52

eg)

0 1

0.2

0.3

0.4

D)

0 5

1

1.5

2

g)

-0.3-0.2-0.10.00.1

Sway

(A

-1.5-1-0.500.5

Yaw

(de

-0.3

-0.2

-0.10

0.1

Sway

(A/D

-1.5

-1

-0.50

0.5

Yaw

(deg

-0.40 500 1000 1500 2000 2500

Time(s)

-2

Sway(A/D) Yaw(deg)

-0.40 500 1000 1500 2000 2500

Time (s)

-2

Sway (A/D) Yaw (deg)

Figure 11. Sway(A/D) and Yaw(deg) vs Time(sec) from CFD analysis using RANS

Figure 12. Sway(A/D) and Yaw(deg) vsTime(sec) from CFD analysis using SA/DESTime(sec) from CFD analysis using RANS

approximation, Ur(sway)~8, Ur (yaw)~5, 45° heading, heavy draft case (2L/D=3) 4-Column TLP model from Ref [6].

Time(sec) from CFD analysis using SA/DESapproximation, Ur (sway)~8, Ur (yaw)~5, 45°heading, heavy draft case (2L/D=3) 4-Column TLP model from Ref [6].

TLP Heavy Draft 45 deg heading - Sway Nominal A/D vs Ur

TLP Heavy Draft 45 deg heading - Yaw Nominal A vs Ur

0 15

0.20

0.25

0.30

0.35

min

al A

/D

Model Test

CFD DES

CFD DES CdyStdev0.05CFD DES truncate FS 0 6

0.8

1.0

1.2

1.4

nal A

(deg

)

Model Test

CFD DES

CFD DES CdyStdev0 05

0.00

0.05

0.10

0.15

6 8 10 12

Sway Ur

Nom

CFD DES truncate FS

CFD DES SharpCorners*CFD DES Rough3e4m

CFD RANS

0.0

0.2

0.4

0.6

2 4 6 8

Yaw Ur

Nom

in Stdev0.05CFD DES SharpCornersCFD DES Rough3e-4mCFD RANS

Sway Ur

Figure 13. Nominal sway response ofCFD compared to model test resultsf R f [6]

Yaw Ur

Figure 14. Nominal response curves ofCFD compared to model test results fromRef. [6].

from Ref. [6].

Development of Novel Hull Forms:HVS Semisubmersible

Advantageous for fabrication with existing regional infrastructurePotential for application as a “Dry-Tree SEMI” in moderate SE Asia wave environment

22

Hulls Screened by CFD

Blister Case 1 Hybrid 1:B C 10 PH Blister Case 1 Hybrid 1: Vertical Plate (9m) +Short Blister (9m)

Circular StrakeBase Case – 10 m PH

Base Case – 12 m PH Square Strake Hybrid 3: 3 Vertical Plates (9m)

Blister Case 3

23

T

3 Vertical Plates (9m) +Short Blister (9m)

CFD vs Model Test

24

Title of

presentatio

n in Head

er

Reduced Velocity ( UT / D)

Flow Visualization

Vertical vortex core near columnSmall drag on pontoon

► Slanted vortex core away from column

25

Title of

presentatio

n in Head

er

Small drag on pontoon►Higher drag on pontoon

Table of Contents

Technip Introduction p

R&D on Floating Platforms

Early CFD ApplicationsEarly CFD Applications

Design of Floating Platforms for Southeast Asia

Riser VIV Suppression

Ringing of Offshore Platform

Future Work

Conclusions

26

VIV Suppression Devices

Strakes – Cd~1.8 to 2.0 Fairings – Cd~0.7

Both reduce VIVBoth reduce VIV

Fairings can significantly reduce overall drag on the TLP

Reduced payload from tendon tensions, saves $$$

But performance needs to be verified

© AIMS International

Towing Bare Riser to Simulate Currents

Riser with Weathervaning Fairing

Riser VIV Calculation Details

Approx 825,000 CellsAutoselect recommended optionsAutoselect recommended options1 Degree of Freedom, DFBIDt=0.01 sec, 5 sub iterations/ timestep2nd order time marching

17070 mm

8170

000,120~061

17.07.0Re 2

−=

sms

me

ms

5.717.0

8.17.0==

m

ssUr

30

31

Fairing Stuck at 120 degs to the flow

32

Table of Contents

Technip Introduction p

R&D on Floating Platforms

Early CFD ApplicationsEarly CFD Applications

Design of Floating Platforms for Southeast Asia

Riser VIV Suppression

Ringing of Offshore Platform

Future Work

Conclusions

33

CFD Application: Ringing of Steel Gravity Base Structure (SGS)Remote location (NW Australia Shelf)Moderate water depth < 100mExtreme metocean criteria (100 year cyclone)

Coauthors: Jang Whan Kim / Jaime Tan

http://www.offshoreenergytoday.com

Overview – Ringing Phenomenon

In designing offshore platforms located in severe wave conditions, the potential resonance response of the hull structure due to wave loads must be checked.

Conventional wave load analysis based on linear wave theory does not fshow dynamic amplification.

Steep waves are non-linear and may contain significant energy at higher harmonics of fundamental frequency.

Forcing frequency of the higher-harmonic non-linear wave load ~ natural frequency of the structural vibration

=> ringing occursg g

35

Computing Resources

BoxClusterDSN

CPU: Intel® Xeon® L5520 x 2 per node, 2.26GHz

Memory: 96GB (host), 48GB (client)

( ) G ( )HDD: 1TB (host), 250GB (client)

OS: Red Hat Enterprise Linux 5

RAID box - QNAP TS-879U-RPRAID box QNAP TS 879U RP

Amazon Elastic Compute Cloud

On-demand instances, USD2.40 per hour

Cluster Compute Eight Extra Large 60.5GB memory, 88 EC2 Compute Units

2 x Intel® Xeon® E5-2670, 8-core “Sandy Bridge” architecture), y g )

OS: SUSE Linux Enterprise Server

CFD Simulation of Short-Crested SeasImplementation of Absorbing Boundary Conditions

37

Ringing Analysis Methodology1.

CFD analysis calculates dynamic

pressure onpressure on structure

2. M d l l i5. Modal analysis

simulates dynamic structural response

of structure

5. Structural analysis using ringing loads

3. Approximation

4. Calibration of short- Approximation

method calculates ringing response from model test

Calibration of short-duration CFD-modal analysis

results

Footer can

be customize

38

Table of Contents

Technip Introduction p

R&D on Floating Platforms

Early CFD ApplicationsEarly CFD Applications

Design of Floating Platforms for Southeast Asia

Riser VIV Suppression

Ringing of Offshore Platform

Future Work

Conclusions

39

Tandem Riser VIV Tests – Phase 3

An improved set-up for testing VIV of multiple risers.multiple risers.

Performance of fairings in tandem

Tests ongoing at UTM

CFD Analysis ramping up Towing directionramping up Towing direction

Two-Body Interactions

West Alliance TADWest Seno TLP

41

Experiments at NU Singapore (Jimmy Ng/ John Halkyard)Simplified Model of Kikeh Spar+TAD Column (200 scale)

Study Wave/Wake Interactions

Tow the (fixed) cylinders in regular waves

Measure the force on the downstream cylinder section

sTsmU

UTDS

s

492PeriodSheddingVortex/05.0SpeedCurrent

18.0Number Strouhal

×====

===

mdmDsTs

075.0diameter Cylinder Small166.0DiameterCylinder Large

4.92PeriodSheddingVortex

====

×==

1.5D

0.6D

5 cycles/(47s)

44

Future Work

Future applications for Gen-Y offshore engineers: Use CFD to replace aging baby-boomer’s empirical know-how. p g g y pDo things the towing tank cannot do.

Solve realistic oceanic flows with sheared currents with variable temperature density and directiontemperature, density and direction. Address scaling effects of model test results. Include dynamic structural response through FSI (mapping to dynamic structural model of TLP)

Wind loads on offshore structures topsidesUseful for initial design estimatesUse u o t a des g est ates

45

Conclusions

CFD applications gaining from advances in software/hardwareSignificant advances being made solving difficult problems w/CFDLocal know-how in Malaysia is improvingBuilding CFD capability is a good use of local resources Capability to address VIM has advanced from single column (Spars)Capability to address VIM has advanced from single column (Spars) to include multi-column floating platformsFree surface applications with VOF approach allows calculation of higher-order wave loads for resonant structure behaviorhigher order wave loads for resonant structure behaviorCFD results complement/complete model testsNow possible to perform short-crested random wave simulations

More realistic and less conservative approachBenchmarking still required to assure reliable resultsFuture work involving multiple bodies is needed to addressg p

Behavior of multiple risers/fairingsInteractions of 2 floating bodies in current+waves

46

Thank you!

Shell Sabah Petroleum and Technip for permission to show the model testsShell Sabah Petroleum and Technip for permission to show the model testsJaime Tan for carrying out the Star CCM+ CFD AnalysisJang Whan Kim for Ringing AnalysisCD Ad f S ki O t it

www.technip.com

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