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Verification of SubDyn and HydroDyn
Results Summery
Evan Gaertner
Case 1: MonopileDistributed Buoyancy
0 20 40 60 80-0.5
0
0.5
Time (s)
Buo
yanc
y F
orce
, X
(kN
/m) HydroDyn
0 20 40 60 80-0.5
0
0.5
Time (s)
Buo
yanc
y F
orce
, X
(kN
/m) Analytical
0 20 40 60 80-0.5
0
0.5
Time (s)
% D
iffer
ence
Z = -20
Z = -16
Z = -12Z = -8
Z = -4
Z = 0
0 20 40 60 80-0.5
0
0.5
Time (s)
Buo
yanc
y F
orce
, Y
(kN
/m) HydroDyn
0 20 40 60 80-0.5
0
0.5
Time (s)
Buo
yanc
y F
orce
, Y
(kN
/m) Analytical
0 20 40 60 80-0.5
0
0.5
Time (s)
% D
iffer
ence
Z = -20
Z = -16
Z = -12Z = -8
Z = -4
Z = 0
0 20 40 60 80-0.5
0
0.5
Time (s)
Buo
yanc
y F
orce
, Z
(kN
/m) HydroDyn
0 20 40 60 80-0.5
0
0.5
Time (s)
Buo
yanc
y F
orce
, Z
(kN
/m) Analytical
0 20 40 60 80-0.5
0
0.5
Time (s)
% D
iffer
ence
Z = -20
Z = -16
Z = -12Z = -8
Z = -4
Z = 0
Case 2: TripodBuoyancy
Distributed Buoyancy:
A) Horizontal (Member 45)
B) Vertical, Tapered (Member 46)
C) Angled (Member 20)
Tripod: Total BuoyancyFBx [N]
FBy [N]
FBz [N]
MBx [Nm]
MBy [Nm]
MBz [Nm]
HydroDyn -1.113E+02 2.930E-02 2.829E+06 -1.346E+00 7.741E+02 4.194E-02OTC: HydroDyn* 0 0 7.330E+06
OTC: STAR-CCM+* 0 0 7.460E+06
* Includes joint overlap
0 20 40 60 80-0.5
0
0.5
Time (s)
Buo
yanc
y F
orce
, Z
(kN
/m) HydroDyn
0 20 40 60 80
1.1372
1.1372
1.1372
1.1372
1.1373
x 104
Time (s)
Buo
yanc
y F
orce
, Z
(kN
/m) Analytical
0 5099.5
100
100.5
Time (s)
% D
iffer
ence
X = -6.201, Y = -10.74X = -9.9213, Y = -8.592
X = -13.6416, Y = -6.444
X = -17.3619, Y = -4.296
X = -21.0822, Y = -2.148X = -24.8025, Y = 0
0 20 40 60 80-0.5
0
0.5
Time (s)
Buo
yanc
y F
orce
, Z
(kN
/m) HydroDyn
0 20 40 60 80
1.762
1.764
1.766
1.768x 10
5
Time (s)
Buo
yanc
y F
orce
, Z
(kN
/m) Analytical
0 20 40 60 8099.5
100
100.5
Time (s)
% D
iffer
ence
Z = -34.7133Z = -34.2083
Z = -33.7033
Z = -33.1983
Z = -32.6933Z = -32.1883
Case 2: TripodDistributed Buoyancy
Horizontal Vertical, Tapered Angled
0 20 40 60 801.3768
1.3769
1.3769x 10
4
Time (s)
Buo
yanc
y F
orce
, Z
(kN
/m) HydroDyn
0 20 40 60 80
1.3773
1.3774
1.3774
1.3774
1.3774x 10
4
Time (s)
Buo
yanc
y F
orce
, Z
(kN
/m) Analytical
0 20 40 60 80
-0.4
-0.2
0
0.2
0.4
Time (s)
% D
iffer
ence
Z = -19.6538Z = -17.723
Z = -15.7923
Z = -13.8615
Z = -11.9308Z = -10
Case 3: JacketTotal Buoyancy
Jacket: Total BuoyancyFBx
[kN]FBy
[kN]FBz
[kN]MBx
[kNm]MBy
[kNm]MBz
[kNm]External 0 0 -1.96E+04 0 0 0Internal 0 0 -1.86E+04 0 0 0
Total 0 0 -3.81E+04 0 0 0Total
(H. SongNo Overlap)
0 0 3.88E+03
Hyd
roD
yn
Case 4: MonopileMorison LoadsCurrent: Linear velocity distribution from 0 to 2 m/s at MSL
0 20 40 60 80-0.5
0
0.5
Time (s)
Dyn
. P
ress
. F
orce
, X
(kN
/m)
HydroDyn
0 20 40 60 80-0.5
0
0.5
Time (s)
Dyn
. P
ress
. F
orce
, X
(kN
/m)
Analytical
0 20 40 60 80-0.5
0
0.5
Time (s)
% D
iffer
ence
Z = -20
Z = -16
Z = -12Z = -8
Z = -4
Z = 0
0 20 40 60 80-0.5
0
0.5
Time (s)
Iner
tial F
orce
, X
(kN
/m) HydroDyn
0 20 40 60 80-0.5
0
0.5
Time (s)
Iner
tial F
orce
, X
(kN
/m) Analytical
0 20 40 60 80-0.5
0
0.5
Time (s)
% D
iffer
ence
Z = -20
Z = -16
Z = -12Z = -8
Z = -4
Z = 0
0 20 40 60 80
0
2000
4000
6000
8000
Time (s)
Dra
g F
orce
, X
(K
N/m
)
HydroDyn
0 20 40 60 80
0
2000
4000
6000
8000
Time (s)
Dra
g F
orce
, X
(K
N/m
)
Analytical
0 20 40 60 80
0
2
4
6
x 10-6
Time (s)
% D
iffer
ence
Z = -20Z = -16
Z = -12
Z = -8
Z = -4Z = 0
Case 5: MonopileMorison LoadsRegular Waves: T = 10s, Hs = 6m
0 20 40 60 80-0.5
0
0.5
Time (s)
Dyn
. P
ress
. F
orce
, X
(kN
/m)
HydroDyn
0 20 40 60 80-0.5
0
0.5
Time (s)
Dyn
. P
ress
. F
orce
, X
(kN
/m)
Analytical
0 20 40 60 80-0.5
0
0.5
Time (s)
% D
iffer
ence
Z = -20
Z = -16
Z = -12Z = -8
Z = -4
Z = 0
0 20 40 60 80
-1000
0
1000
Time (s)
Dra
g F
orce
, X
(K
N/m
)
HydroDyn
0 20 40 60 80
-1000
0
1000
Time (s)
Dra
g F
orce
, X
(K
N/m
)
Analytical
0 20 40 60 80
-5
0
5
x 10-3
Time (s)
% D
iffer
ence
Z = -20Z = -16
Z = -12
Z = -8
Z = -4Z = 0
0 20 40 60 80
-2
0
2
x 104
Time (s)
Iner
tial F
orce
, X
(kN
/m) HydroDyn
0 20 40 60 80
-2
0
2
x 104
Time (s)
Iner
tial F
orce
, X
(kN
/m) Analytical
0 20 40 60 80-6
-4
-2
0
2
4x 10
-3
Time (s)
% D
iffer
ence
Z = -20Z = -16
Z = -12
Z = -8
Z = -4Z = 0
Case 6: MonopileMorison LoadsIrregular Waves: JONSWAP T = 10s, Hs = 8m
0 20 40 60 80-0.5
0
0.5
Time (s)
Dyn
. P
ress
. F
orce
, X
(kN
/m)
HydroDyn
0 20 40 60 80-0.5
0
0.5
Time (s)
Dyn
. P
ress
. F
orce
, X
(kN
/m)
Analytical
0 20 40 60 80-0.5
0
0.5
Time (s)
% D
iffer
ence
Z = -20
Z = -16
Z = -12Z = -8
Z = -4
Z = 0
0 20 40 60 80
-2
0
2
x 104
Time (s)
Dra
g F
orce
, X
(K
N/m
)
HydroDyn
0 20 40 60 80
-2
0
2
x 104
Time (s)
Dra
g F
orce
, X
(K
N/m
)
Analytical
0 20 40 60 80
-0.01
-0.005
0
0.005
0.01
Time (s)
% D
iffer
ence
Z = -20Z = -16
Z = -12
Z = -8
Z = -4Z = 0
0 20 40 60 80-4
-2
0
2
x 105
Time (s)
Iner
tial F
orce
, X
(kN
/m) HydroDyn
0 20 40 60 80-4
-2
0
2
x 105
Time (s)
Iner
tial F
orce
, X
(kN
/m) Analytical
0 20 40 60 80
-5
0
5
x 10-3
Time (s)
% D
iffer
ence
Z = -20Z = -16
Z = -12
Z = -8
Z = -4Z = 0
Case 7: Natural Frequencies Monopile
Ansys[Hz]
SubDyn[Hz] Difference
1 0.290 0.288 -0.80%2 0.290 0.288 -0.80%3 2.365 2.361 -0.17%4 2.365 2.361 -0.17%5 6.126 6.134 0.12%6 6.126 6.134 0.12%7 7.111 7.106 -0.07%8 11.487 11.414 -0.64%9 11.687 11.731 0.37%
10 11.687 11.731 0.37%11 19.051 19.450 2.10%12 19.051 19.450 2.10%13 23.034 23.394 1.56%14 26.823 27.240 1.56%15 27.385 29.941 9.33%16 27.385 29.941 9.33%17 34.881 36.123 3.56%18 36.023 41.244 14.49%19 36.023 41.244 14.49%20 45.211 46.649 3.18%
Tripod
Ansys[Hz]
SubDyn[Hz] Difference
1 0.321 0.323 0.62%2 0.321 0.323 0.62%3 2.649 2.750 3.82%4 2.649 2.750 3.82%5 3.883 4.045 4.17%6 3.883 4.045 4.17%7 3.897 4.060 4.16%8 3.915 4.078 4.17%9 3.915 4.078 4.17%
10 3.935 4.099 4.17%11 4.309 4.493 4.26%12 4.602 4.799 4.29%13 4.602 4.799 4.30%14 5.589 5.719 2.33%15 6.004 6.262 4.30%16 6.004 6.262 4.30%17 6.193 6.447 4.11%18 6.941 7.230 4.17%19 6.941 7.231 4.18%20 7.324 7.637 4.27%
Jacket
Ansys[Hz]
SubDyn[Hz] Difference
1 2.676 2.650 -0.98%2 2.676 2.650 -0.98%3 4.826 4.813 -0.27%4 5.281 5.205 -1.44%5 7.484 7.337 -1.97%6 7.484 7.337 -1.97%7 8.285 8.128 -1.89%8 8.582 8.585 0.04%9 9.018 9.030 0.13%
10 9.575 9.583 0.08%11 9.575 9.583 0.08%12 10.201 10.213 0.12%13 10.947 10.972 0.23%14 11.317 11.137 -1.59%15 11.680 11.705 0.21%16 11.684 11.705 0.18%17 11.768 11.794 0.22%18 11.929 11.881 -0.40%19 11.929 11.881 -0.40%20 11.983 12.005 0.18%
To Transition PieceTo Tower TopTo Tower Top
Natural Frequencies, TripodTripod
Old New
Ansys[Hz]
SubDyn[Hz] Difference SubDyn
[Hz] Difference
1 0.321 0.323 0.62% 0.323 0.62%2 0.321 0.323 0.62% 0.323 0.62%3 2.649 2.750 3.82% 2.750 3.82%4 2.649 2.750 3.82% 2.750 3.82%5 3.883 4.045 4.17% 4.045 4.17%6 3.883 4.045 4.17% 4.045 4.17%7 3.897 4.060 4.16% 4.060 4.16%8 3.915 4.078 4.17% 4.078 4.17%9 3.915 4.078 4.17% 4.078 4.17%
10 3.935 4.099 4.17% 4.099 4.17%11 4.309 4.493 4.26% 4.493 4.26%12 4.602 4.799 4.29% 4.799 4.29%13 4.602 4.799 4.30% 4.799 4.30%14 5.589 5.719 2.33% 5.719 2.33%15 6.004 6.262 4.30% 6.262 4.30%16 6.004 6.262 4.30% 6.262 4.30%17 6.193 6.447 4.11% 6.447 4.11%18 6.941 7.230 4.17% 7.230 4.17%19 6.941 7.231 4.18% 7.231 4.18%20 7.324 7.637 4.27% 7.637 4.27%
Case 8: Reaction Loads
Ansys[N]
SubDyn[N] Difference
Monopile 8.5610E+06 8.5577E+06 0.04%Tripod 1.4972E+07 1.4729E+07 1.62%Jacket 5.7942E+06 5.6957E+06 1.70%
Under Self Weight
OC4 Paper: Jacket Masses
Figure 2: HydroDynMass (t)
RNA 350TowerJacket 671.6243
OC4 Paper: Jacket Masses
Figure 3: HydroDynMass (t)
Hydrodynamic added mass to MSL -3,883.8Water mass in free flooded legs to MSL 183Growth mass 189.84