The hydrodynamic coefficients and heaving damping of a truss spar platform were studied by the computational fluid dynamics (CFD) method with considering the semiclosed moon pool. A partial model was established to investigate the added mass and viscous damping of platform heaving; a full model and a simplified model were established to study the nonlinear damping of platform heaving. The influences of opening ratios of moon pool on the added mass and viscous damping of platform heaving were analyzed. It is found that the natural period and the heaving added mass of the platform increase if the semiclosed moon pool is considered. Different opening ratios of the moon pool will lead to different heaving damping of the platform and dynamic pressure acting on the guide plate of the moon pool. In practice, an optimal opening ratio of the moon pool can be designed. The numerical results were verified by comparing with the results of model experiments.

References

References
1.
Drobyshevski
,
Y.
,
2004
, “
Hydrodynamic Coefficients of a Two-Dimensional, Truncated Rectangular Floating Structure in Shallow Water
,”
Ocean Eng.
,
31
(
3–4
), pp.
305
341
.
2.
Perryman
,
S.
,
Gebara
,
J.
,
Botros
,
F.
, and
Yu
,
A.
,
2005
, “
Holstein Truss Spar and Top Tensioned Riser System Design Challenges and Innovations
,”
Proceedings of Offshore Technology Conference
(
OTC 2005
), Paper No.OTC-17292-MS.
3.
Holmes
,
S.
,
Gebara
,
J.
, and
Magee
,
A.
,
2008
, “
Centerwell Water Motions and Hydrodynamic Loading Using Viscous Flow Calculations
,”
ASME
Paper No. OMAE2008-57882.
4.
Gupta
,
H.
,
Blevins
,
R.
, and
Banon
,
H.
,
2008
, “
Effect of Moon Pool Hydrodynamics on Spar Heave
,”
ASME
Paper No. OMAE2008-57264.
5.
Barreira
,
R.
,
Sphaier
,
S. H.
, and
Masetti
, I
. Q.
,
2005
, “
Behavior of a Mono-Column Structure (MonoBr) in Waves
,”
ASME
Paper No. OMAE2005-67512.
6.
Sphaier
,
S. H.
,
Torres
,
F. G. S.
,
Masetti
, I
. Q.
,
Costa
,
A. P.
, and
Levi
,
C.
,
2007
, “
Mono Column Behavior in Waves: Experimental Analysis
,”
Ocean Eng.
,
34
(11–12), pp.
1724
1733
.
7.
Spanos
,
P. D.
,
Nava
,
V.
, and
Arena
,
F.
,
2011
, “
Coupled Surge-Heave-Pitch Dynamic Modeling of Spar–Moon Pool–Riser Interaction
,”
ASME J. Offshore Mech. Arct. Eng.
,
133
(
2
), p.
021301
.
8.
Liu
,
L. Q.
,
Atilla
,
I.
, and
Zhang
,
Y. H.
,
2014
, “
Analysis of Heave Motions of a Truss Spar Platform With Semi-Closed Moon Pool
,”
Ocean Eng.
,
94
, pp.
162
174
.
9.
Faltinsen
,
O. M.
,
Rognebakke
,
O. F.
, and
Timokha
,
A. N.
,
2007
, “
Two-Dimensional Resonant Piston-Like Sloshing in a Moonpool
,”
J. Fluid Mech.
,
575
(
9
), pp.
359
397
.
10.
Kristiansen
,
T.
, and
Faltinsen
,
O. M.
,
2010
, “
A Two-Dimensional Numerical and Experimental Study of Resonant Coupled Ship and Piston-Mode Motion
,”
Appl. Ocean Res.
,
32
(
2
), pp.
158
176
.
11.
Kristiansen
,
T.
, and
Faltinsen
,
O. M.
,
2012
, “
Gap Resonance Analyzed by a New Domain-Decomposition Method Combining Potential and Viscous Flow DRAFT
,”
Appl. Ocean Res.
,
34
(
1
), pp.
198
208
.
12.
Sun
,
C. W.
,
2013
, “
Investigation on the Hydrodynamic Performances of Deep Water Drillship
,” M.S. thesis, Shang Hai Jiao Tong University, Shanghai, China.
13.
Zhang
,
S. S.
,
2010
,
CFD Software and Its Application
,
Huazhong University Press
,
Wuhan, China
, pp.
6
7
.
14.
Analytis
,
G. Th.
,
2003
, “
Implementation of the Renormalization Group (RNG) k–ε Turbulence Model in GOTHIC/6.lb: Solution Methods and Assessment
,”
Ann. Nucl. Energy
,
30
(
3
), pp.
349
387
.
15.
Ghosh
,
R.
, and
Spanos
,
P. D.
,
2009
, “
Determination of Offshore Spar Stochastic Structural Response Accounting for Nonlinear Stiffness and Radiation Damping Effects
,”
J. Mech. Mater. Struct.
,
4
(
7–8
), pp.
1327
1340
.
16.
Hirt
,
C.
, and
Nichols
,
B.
,
1981
, “
Volume of Fluid (VOF) Method for the Dynamics of Free Boundaries
,”
J. Comput. Phys.
,
39
(
1
), pp.
201
225
.
17.
Purath
,
B. T.
,
2006
, “
Numerical Simulation of the Truss Spar ‘Horn Mountain’ Using Couple
,” M.S. thesis, Texas A&M University, Austin, TX.
18.
Shen
,
W. J.
,
Tang
,
Y. G.
, and
Liu
,
L. Q.
,
2012
, “
Research on the Hydrodynamic Characteristics of Heave Plate Structure With Different Form Edges of a Spar Platform
,”
China Ocean Eng.
,
26
(
1
), pp.
177
184
.
19.
Yang
,
J. M.
,
Tian
,
X. L.
, and
Li
,
X.
,
2014
, “
Hydrodynamic Characteristics of an Oscillating Circular Disk Under Steady In-Plane Current Conditions
,”
Ocean Eng.
,
75
, pp.
53
63
.
20.
Faltinsen
,
O. M.
,
1990
,
Sea Loads on Ships and Offshore Structures
,
Cambridge University Press
,
Cambridge, UK
, pp.
252
253
.
You do not currently have access to this content.