Floating Production, Storage and Offloading (FPSO) Facilities
Modeling Wind Shielding for FPSO Tandem Offloading using …
Transcript of Modeling Wind Shielding for FPSO Tandem Offloading using …
![Page 1: Modeling Wind Shielding for FPSO Tandem Offloading using …](https://reader030.fdocuments.net/reader030/viewer/2022012418/6172f2084377dc2171260e71/html5/thumbnails/1.jpg)
Modeling Wind Shielding for FPSO Tandem Offloading using CFD
Bob Gordon, GranherneSatpreet Nanda, CD-adapco
![Page 2: Modeling Wind Shielding for FPSO Tandem Offloading using …](https://reader030.fdocuments.net/reader030/viewer/2022012418/6172f2084377dc2171260e71/html5/thumbnails/2.jpg)
Presentation Outline
• FPSO Tandem Offloading• Examples of Shielding in Offshore Applications• Wind Tunnel Tests for Tandem Offloading• Preliminary CFD Results• Summary
2
![Page 3: Modeling Wind Shielding for FPSO Tandem Offloading using …](https://reader030.fdocuments.net/reader030/viewer/2022012418/6172f2084377dc2171260e71/html5/thumbnails/3.jpg)
FPSO Tandem Offloading
• FPSO can be spread or turret moored– If turret moored, FPS orients into wind,
wave and current• Tanker approaches under its own
power and moors (with work boat assistance) to FPSO using hawsers
• FPSO & Tanker are in close proximity during offloading and both change draft
3
Turret Moored FPSO
![Page 4: Modeling Wind Shielding for FPSO Tandem Offloading using …](https://reader030.fdocuments.net/reader030/viewer/2022012418/6172f2084377dc2171260e71/html5/thumbnails/4.jpg)
Effects of Shielding
• FPSO shields tanker from environment– Impacts tanker’s maneuverability
during approach– Impacts separation distance while
connected
• Relative headings of the vessels can vary significantly during offloading due to shielding, effects of current, or fish-tailing
4
Spread Moored FPSO
![Page 5: Modeling Wind Shielding for FPSO Tandem Offloading using …](https://reader030.fdocuments.net/reader030/viewer/2022012418/6172f2084377dc2171260e71/html5/thumbnails/5.jpg)
Collisions and Near Misses During Tandem Offloading in North Sea 1996-2000
5
Source: UK HSE Offshore Technology Report 2000/086
![Page 6: Modeling Wind Shielding for FPSO Tandem Offloading using …](https://reader030.fdocuments.net/reader030/viewer/2022012418/6172f2084377dc2171260e71/html5/thumbnails/6.jpg)
Examples of Shielding in Offshore Applications
6
Truss Spar Platform
Multiple Riser Towers
Grouped Single Line Risers
![Page 7: Modeling Wind Shielding for FPSO Tandem Offloading using …](https://reader030.fdocuments.net/reader030/viewer/2022012418/6172f2084377dc2171260e71/html5/thumbnails/7.jpg)
Velocity Reduction due to Shielding
7
From van Walree and Willemsen, 1988
![Page 8: Modeling Wind Shielding for FPSO Tandem Offloading using …](https://reader030.fdocuments.net/reader030/viewer/2022012418/6172f2084377dc2171260e71/html5/thumbnails/8.jpg)
Wind Tunnel Tests
• Part of MARIN’s Offloading Operability JIP
• Tests performed at DNW in 2003• Model scale was 1:250• Barge-shaped FPSO model and
shuttle tanker• Measurement of unshielded wind
and current forces• Measurement of wind velocities
behind the FPSO• Measurement of shielded forces
for validation of shielding model8
![Page 9: Modeling Wind Shielding for FPSO Tandem Offloading using …](https://reader030.fdocuments.net/reader030/viewer/2022012418/6172f2084377dc2171260e71/html5/thumbnails/9.jpg)
Use of CFD to Model Wind Tunnel Tests
• Collaborative effort between MARIN, Granherne/KBR and CD-adapco
• Surface geometry models prepared by MARIN• MARIN using in-house code and Granherne
using STAR-CCM+• Granherne calculations performed in the blind• Comparisons will be made against model test
data and between CFD codes• Goal is to present joint paper at OMAE 2010
9
![Page 10: Modeling Wind Shielding for FPSO Tandem Offloading using …](https://reader030.fdocuments.net/reader030/viewer/2022012418/6172f2084377dc2171260e71/html5/thumbnails/10.jpg)
Vessel Characteristics
10
450 m
![Page 11: Modeling Wind Shielding for FPSO Tandem Offloading using …](https://reader030.fdocuments.net/reader030/viewer/2022012418/6172f2084377dc2171260e71/html5/thumbnails/11.jpg)
Position of Vessels Relative to Incident Wind & Velocity Profile
11
Wind
Velocity Profile
V/V10
Z/Z10
![Page 12: Modeling Wind Shielding for FPSO Tandem Offloading using …](https://reader030.fdocuments.net/reader030/viewer/2022012418/6172f2084377dc2171260e71/html5/thumbnails/12.jpg)
Surface Mesh
12
![Page 13: Modeling Wind Shielding for FPSO Tandem Offloading using …](https://reader030.fdocuments.net/reader030/viewer/2022012418/6172f2084377dc2171260e71/html5/thumbnails/13.jpg)
Volume Mesh
13
1.44 Million Cells
SST k-omega turbulence model
y+ wall treatment
![Page 14: Modeling Wind Shielding for FPSO Tandem Offloading using …](https://reader030.fdocuments.net/reader030/viewer/2022012418/6172f2084377dc2171260e71/html5/thumbnails/14.jpg)
Speed Contours in Horizontal Plane
14
Z=5m
Z=30m
A A
A A
B
B
![Page 15: Modeling Wind Shielding for FPSO Tandem Offloading using …](https://reader030.fdocuments.net/reader030/viewer/2022012418/6172f2084377dc2171260e71/html5/thumbnails/15.jpg)
Speed Contours in Vertical Plane
15
A A
B B
![Page 16: Modeling Wind Shielding for FPSO Tandem Offloading using …](https://reader030.fdocuments.net/reader030/viewer/2022012418/6172f2084377dc2171260e71/html5/thumbnails/16.jpg)
Streamlines
16
![Page 17: Modeling Wind Shielding for FPSO Tandem Offloading using …](https://reader030.fdocuments.net/reader030/viewer/2022012418/6172f2084377dc2171260e71/html5/thumbnails/17.jpg)
Pressure Contour
17
![Page 18: Modeling Wind Shielding for FPSO Tandem Offloading using …](https://reader030.fdocuments.net/reader030/viewer/2022012418/6172f2084377dc2171260e71/html5/thumbnails/18.jpg)
Drag and Lift on Tanker
18
Tandem Arrangement (450 m separation)
Shuttle Tanker Only
Wind Tunnel Measurement
OCIMF
DRAG LIFT
![Page 19: Modeling Wind Shielding for FPSO Tandem Offloading using …](https://reader030.fdocuments.net/reader030/viewer/2022012418/6172f2084377dc2171260e71/html5/thumbnails/19.jpg)
Summary
• Tandem offloading operations are sensitive to weather conditions
• Accurate simulation of tandem offloading is difficult due to wind shielding
• Wind loads on the shuttle tanker vary with relative wind direction, distance from FPSO and orientation relative to FPSO
• Wind tunnel testing is limited due to relatively small number of configurations that can be tested
• Preliminary CFD results indicate good agreement with wind tunnel data (but little shielding for case investigated)
• CFD can provide a suitable means to augment wind tunnel test data
19
![Page 20: Modeling Wind Shielding for FPSO Tandem Offloading using …](https://reader030.fdocuments.net/reader030/viewer/2022012418/6172f2084377dc2171260e71/html5/thumbnails/20.jpg)
Acknowledgement
• Thanks to Dr. Arjen Koop of MARIN for collaborating in this endeavor and for providing the vessel geometry models
20