ORCAWAVE |
 
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ORCAWAVE |
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This section outlines how the relevant data is obtained from OrcaWave and converted into Flexcom.
After OrcaWave calculations completes, results are presented in an Excel-compatible (.xlsx or .xls) spreadsheet (read-only) with tabs displaying tables of results. Depending on the model features, results tables can vary but at the moment the Flexcom importable results include:
•Hydrostatics
•Added mass and damping
•Load RAOs (Diffraction and Haskind)
•Displacement RAOs
•Drift loads (i.e. mean drift/Newman QTF loads)
The relevant Hydrodynamic Stiffness data is located in the "Hydrostatics" sheet, as shown in the following example.
Hydrostatics |
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OrcaWave 11.1b: L02 OC4 Semi-sub.owr (modified 9:13 AM on 29-Mar-21 by OrcaWave 11.0b) |
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Body1 |
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Volume (m^3) |
13371.6769 |
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Mass (te) |
14072.72 |
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Centre of gravity (m) |
-0.0102 |
0.0 |
-9.8902 |
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Centre of buoyancy (m) |
-0.0029 |
0.0 |
-13.2 |
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Water plane area (m^2) |
362.9425 |
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Centre of floatation (m) |
-0.0026 |
0.0 |
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Water plane moment Lxx (m^4) |
140720.018 |
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Water plane moment Lyy (m^4) |
140736.5219 |
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Water plane moment Lxy (m^4) |
0.0 |
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Hydrostatic stiffness matrix |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
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0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
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0.0 |
0.0 |
3648.2313 |
0.0 |
9.3774 |
0.0 |
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0.0 |
0.0 |
0.0 |
1003220.7241 |
0.0 |
-1022.1772 |
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0.0 |
0.0 |
9.3774 |
0.0 |
1003050.4034 |
0.0 |
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0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
OrcaWave units of the 3x3 block (heave/roll/pitch) of a stiffness matrix are:
where F and L denote force and length units, respectively.
The relevant Added Mass and Radiation Damping data is located in the "Added Mass" and "Damping" sheets, as shown in the following examples.
Added mass |
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OrcaWave 11.1b: L02 OC4 Semi-sub.owr (modified 9:13 AM on 29-Mar-21 by OrcaWave 11.0b) |
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Added mass for period 4.0s |
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DOF |
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Body1 |
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Surge |
Sway |
Heave |
Roll |
Pitch |
Yaw |
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1 |
2 |
3 |
4 |
5 |
6 |
1 |
4882.704 |
0.0 |
0.0296 |
0.0 |
-69125.2298 |
0.0 |
2 |
0.0 |
4882.2406 |
0.0 |
69115.9084 |
0.0 |
-78.8585 |
3 |
0.217 |
0.0 |
14237.3282 |
0.0 |
55.3233 |
0.0 |
4 |
0.0 |
69449.6297 |
0.0 |
7013994.7597 |
0.0 |
-335.0741 |
5 |
-69459.8917 |
0.0 |
57.4877 |
0.0 |
7014791.5568 |
0.0 |
6 |
0.0 |
-69.8588 |
0.0 |
-228.274 |
0.0 |
3909576.9848 |
Orcawave units of the 3x3 blocks of an added mass matrix are:
where M and L denote mass and length units, respectively.
Damping |
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OrcaWave 11.1b: L02 OC4 Semi-sub.owr (modified 9:13 AM on 29-Mar-21 by OrcaWave 11.0b) |
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Damping for period 4.0s |
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DOF |
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Body1 |
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Surge |
Sway |
Heave |
Roll |
Pitch |
Yaw |
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1 |
2 |
3 |
4 |
5 |
6 |
1 |
4996.1118 |
0.0 |
-0.0355 |
0.0 |
-20339.2577 |
0.0 |
2 |
0.0 |
4998.8144 |
0.0 |
20344.3668 |
0.0 |
13.8139 |
3 |
-0.0293 |
0.0 |
41.8528 |
0.0 |
0.2819 |
0.0 |
4 |
0.0 |
20179.2339 |
0.0 |
109372.0665 |
0.0 |
28.3653 |
5 |
-20173.2918 |
0.0 |
0.2174 |
0.0 |
109362.935 |
0.0 |
6 |
0.0 |
19.0343 |
0.0 |
80.2397 |
0.0 |
2713638.3917 |
Orcawave units of the 3x3 blocks of a damping matrix are:
where F, L and T denote force, length and time units, respectively.
The relevant Load RAO data is located in the "Load RAOs (Haskind)" and "Load RAOs (diffraction)" sheets, as shown in the following examples.
Load RAOs (Haskind) |
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OrcaWave 11.1b: L02 OC4 Semi-sub.owr (modified 9:13 AM on 29-Mar-21 by OrcaWave 11.0b) |
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DOF |
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Body1 |
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Surge |
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Sway |
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Heave |
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Roll |
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Pitch |
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Yaw |
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Wave heading |
Period |
1 |
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2 |
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3 |
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4 |
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5 |
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6 |
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Ampl. |
Phase |
Ampl. |
Phase |
Ampl. |
Phase |
Ampl. |
Phase |
Ampl. |
Phase |
Ampl. |
Phase |
deg |
s |
kN/m |
deg |
kN/m |
deg |
kN/m |
deg |
kN.m/m |
deg |
kN.m/m |
deg |
kN.m/m |
deg |
0.0 |
4.0 |
1552.4421 |
211.3981 |
0.0 |
175.5111 |
130.136 |
346.9145 |
0.0 |
89.1349 |
5825.3401 |
351.2653 |
0.0 |
310.5234 |
0.0 |
5.0 |
3493.7735 |
319.2215 |
0.0 |
287.7877 |
1284.7804 |
100.4475 |
0.0 |
258.8618 |
35449.0062 |
135.4807 |
0.0 |
77.3428 |
0.0 |
5.5 |
4782.5462 |
304.4005 |
0.0 |
276.786 |
1261.0172 |
81.6468 |
0.0 |
88.3865 |
47582.7958 |
117.985 |
0.0 |
41.208 |
0.0 |
6.0 |
5560.8616 |
311.0242 |
0.0 |
208.4548 |
1329.5763 |
64.8041 |
0.0 |
74.9774 |
36575.3179 |
129.4346 |
0.0 |
209.3405 |
0.0 |
6.5 |
4161.7693 |
335.306 |
0.0 |
185.2142 |
1246.0818 |
60.1747 |
0.0 |
92.6651 |
15605.9629 |
224.5723 |
0.0 |
195.6393 |
0.0 |
7.0 |
2686.5091 |
1.4962 |
0.0 |
68.327 |
1061.2895 |
70.0728 |
0.0 |
254.0211 |
36614.7318 |
274.3315 |
0.0 |
143.1399 |
0.0 |
7.5 |
2322.7932 |
31.6488 |
0.0 |
92.0851 |
952.5394 |
96.9725 |
0.0 |
230.9493 |
54141.9751 |
276.3595 |
0.0 |
199.2684 |
0.0 |
8.0 |
2651.48 |
53.3302 |
0.0 |
245.5759 |
1075.1032 |
128.0482 |
0.0 |
23.5721 |
66870.8485 |
273.6068 |
0.0 |
187.5389 |
0.0 |
8.5 |
3139.6208 |
65.0601 |
0.0 |
279.3458 |
1312.666 |
148.6555 |
0.0 |
29.2393 |
75620.9705 |
271.0759 |
0.0 |
298.3511 |
0.0 |
9.0 |
3560.5083 |
71.6825 |
0.0 |
161.9588 |
1504.6342 |
160.4658 |
0.0 |
173.0365 |
80606.3272 |
269.4561 |
0.0 |
225.7732 |
0.0 |
9.5 |
3857.9931 |
75.8745 |
0.0 |
54.622 |
1602.2108 |
167.3956 |
0.0 |
12.0696 |
82295.0763 |
268.5831 |
0.0 |
33.1998 |
0.0 |
10.0 |
4034.0402 |
78.7938 |
0.0 |
22.0804 |
1612.3891 |
171.641 |
0.0 |
138.6234 |
81406.7942 |
268.1934 |
0.0 |
276.0653 |
Load RAOs (diffraction) |
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OrcaWave 11.1b: L02 OC4 Semi-sub.owr (modified 9:13 AM on 29-Mar-21 by OrcaWave 11.0b) |
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DOF |
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Body1 |
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Surge |
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Sway |
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Heave |
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Roll |
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Pitch |
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Yaw |
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Wave heading |
Period |
1 |
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2 |
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3 |
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4 |
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5 |
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6 |
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Ampl. |
Phase |
Ampl. |
Phase |
Ampl. |
Phase |
Ampl. |
Phase |
Ampl. |
Phase |
Ampl. |
Phase |
deg |
s |
kN/m |
deg |
kN/m |
deg |
kN/m |
deg |
kN.m/m |
deg |
kN.m/m |
deg |
kN.m/m |
deg |
0.0 |
4.0 |
1616.8744 |
214.1596 |
0.0 |
16.7086 |
150.0771 |
345.112 |
0.0 |
22.5955 |
5672.1165 |
352.5142 |
0.0 |
316.869 |
0.0 |
5.0 |
3524.1749 |
319.5696 |
0.0 |
86.8202 |
1340.3075 |
101.4042 |
0.0 |
78.27 |
35983.1986 |
136.0502 |
0.0 |
322.0869 |
0.0 |
5.5 |
4817.7314 |
304.5872 |
0.0 |
262.2988 |
1299.0218 |
82.4297 |
0.0 |
264.3236 |
48062.2536 |
118.0086 |
0.0 |
333.9087 |
0.0 |
6.0 |
5597.8071 |
311.2136 |
0.0 |
328.0616 |
1362.7948 |
65.2784 |
0.0 |
269.0802 |
36500.1845 |
129.4093 |
0.0 |
334.3401 |
0.0 |
6.5 |
4184.4214 |
335.5126 |
0.0 |
235.9602 |
1276.9539 |
60.4538 |
0.0 |
166.8476 |
15695.3181 |
227.9083 |
0.0 |
339.7247 |
0.0 |
7.0 |
2699.859 |
1.7116 |
0.0 |
13.3804 |
1089.489 |
70.3063 |
0.0 |
265.1193 |
37706.313 |
275.4727 |
0.0 |
177.8591 |
0.0 |
7.5 |
2336.2079 |
31.8325 |
0.0 |
264.4379 |
981.068 |
97.2262 |
0.0 |
106.6543 |
55507.0326 |
277.0072 |
0.0 |
172.8533 |
0.0 |
8.0 |
2668.3127 |
53.4463 |
0.0 |
75.4998 |
1110.8245 |
128.2463 |
0.0 |
319.0491 |
68401.9758 |
274.0474 |
0.0 |
282.0246 |
0.0 |
8.5 |
3160.0953 |
65.1287 |
0.0 |
324.0476 |
1358.5961 |
148.7891 |
0.0 |
339.0898 |
77268.4413 |
271.3971 |
0.0 |
264.0059 |
0.0 |
9.0 |
3584.0397 |
71.7235 |
0.0 |
254.1191 |
1559.5003 |
160.5641 |
0.0 |
45.3165 |
82318.2355 |
269.702 |
0.0 |
168.0255 |
0.0 |
9.5 |
3883.7893 |
75.8995 |
0.0 |
153.202 |
1663.5002 |
167.4734 |
0.0 |
192.6021 |
84019.3291 |
268.78 |
0.0 |
303.4827 |
0.0 |
10.0 |
4061.3097 |
78.8093 |
0.0 |
43.6621 |
1677.8165 |
171.7044 |
0.0 |
345.993 |
83098.6425 |
268.3574 |
0.0 |
44.3969 |
The relevant Displacement RAO data is located in the "Displacement RAOs" sheet, as shown in the following example.
Displacement RAOs |
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OrcaWave 11.1b: L02 OC4 Semi-sub.owr (modified 9:13 AM on 29-Mar-21 by OrcaWave 11.0b) |
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DOF |
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Body1 |
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Surge |
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Sway |
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Heave |
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Roll |
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Pitch |
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Yaw |
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Wave heading |
Period |
1 |
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2 |
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3 |
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4 |
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5 |
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6 |
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Ampl. |
Phase |
Ampl. |
Phase |
Ampl. |
Phase |
Ampl. |
Phase |
Ampl. |
Phase |
Ampl. |
Phase |
deg |
s |
m/m |
deg |
m/m |
deg |
m/m |
deg |
rad/m |
deg |
rad/m |
deg |
rad/m |
deg |
0.0 |
4.0 |
0.036 |
42.9234 |
0.0 |
13.6117 |
0.002 |
167.0425 |
0.0 |
206.8585 |
0.0003 |
56.0602 |
0.0 |
137.6823 |
0.0 |
5.0 |
0.114 |
148.019 |
0.0 |
127.5982 |
0.0313 |
281.8211 |
0.0 |
71.2249 |
0.0001 |
200.4452 |
0.0 |
263.2594 |
0.0 |
5.5 |
0.1825 |
139.7146 |
0.0 |
106.3758 |
0.0376 |
263.0062 |
0.0 |
271.3626 |
0.0004 |
181.0228 |
0.0 |
244.6457 |
0.0 |
6.0 |
0.2201 |
145.9374 |
0.0 |
35.6026 |
0.0478 |
246.2256 |
0.0 |
252.7589 |
0.0013 |
147.2827 |
0.0 |
69.6527 |
0.0 |
6.5 |
0.197 |
158.3398 |
0.0 |
14.4375 |
0.0535 |
241.4094 |
0.0 |
225.6261 |
0.0024 |
138.2799 |
0.0 |
19.4367 |
0.0 |
7.0 |
0.1623 |
173.9745 |
0.0 |
259.7283 |
0.054 |
250.8968 |
0.0 |
80.194 |
0.0035 |
130.2097 |
0.0 |
332.225 |
0.0 |
7.5 |
0.1489 |
197.2771 |
0.0 |
264.9008 |
0.0575 |
277.4601 |
0.0 |
62.8947 |
0.0044 |
122.6131 |
0.0 |
24.11 |
0.0 |
8.0 |
0.1683 |
221.8133 |
0.0 |
51.1194 |
0.0767 |
308.5903 |
0.0 |
204.1939 |
0.0052 |
116.4683 |
0.0 |
8.4917 |
0.0 |
8.5 |
0.2123 |
239.0602 |
0.0 |
94.4823 |
0.1096 |
329.5841 |
0.0 |
249.5526 |
0.0058 |
111.8355 |
0.0 |
108.6892 |
0.0 |
9.0 |
0.2665 |
249.4851 |
0.0 |
331.7835 |
0.1457 |
341.7805 |
0.0 |
0.2374 |
0.0062 |
108.3735 |
0.0 |
47.1169 |
0.0 |
9.5 |
0.3222 |
255.8386 |
0.0 |
267.6795 |
0.1789 |
348.9019 |
0.0 |
181.2306 |
0.0064 |
105.7172 |
0.0 |
213.4493 |
0.0 |
10.0 |
0.3755 |
259.8887 |
0.0 |
171.8863 |
0.2072 |
353.1391 |
0.0 |
331.8753 |
0.0065 |
103.5971 |
0.0 |
96.2774 |
Given that Second-Order Wave Drift Loads in Flexcom are based on Newman's (1974) approximation only, the relevant QTF data is located in the "Mean drift loads (PI)" sheet, as shown in the following example.
Mean drift loads (PI) |
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OrcaWave 11.1b: L02 OC4 Semi-sub.owr (modified 9:13 AM on 29-Mar-21 by OrcaWave 11.0b) |
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DOF |
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Body1 |
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Wave heading |
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Period |
Surge |
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Sway |
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Heave |
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Roll |
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Pitch |
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Yaw |
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1 |
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2 |
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3 |
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4 |
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5 |
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6 |
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(1st order wave 1) |
(1st order wave 2) |
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Ampl. |
Phase |
Ampl. |
Phase |
Ampl. |
Phase |
Ampl. |
Phase |
Ampl. |
Phase |
Ampl. |
Phase |
deg |
deg |
s |
kN/m^2 |
deg |
kN/m^2 |
deg |
kN/m^2 |
deg |
kN.m/m^2 |
deg |
kN.m/m^2 |
deg |
kN.m/m^2 |
deg |
0.0 |
0.0 |
4.0 |
60.1882 |
0.0 |
0.0 |
180.0 |
2.0855 |
0.0 |
0.0 |
180.0 |
202.2284 |
0.0 |
0.0 |
180.0 |
0.0 |
0.0 |
5.0 |
80.2867 |
0.0 |
0.0 |
0.0 |
8.3322 |
0.0 |
0.0 |
180.0 |
340.0095 |
0.0 |
0.0 |
180.0 |
0.0 |
0.0 |
5.5 |
60.2783 |
0.0 |
0.0 |
0.0 |
9.4414 |
0.0 |
0.0 |
180.0 |
212.5962 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
6.0 |
25.7206 |
0.0 |
0.0 |
0.0 |
18.2964 |
0.0 |
0.0 |
0.0 |
136.7775 |
0.0 |
0.0 |
180.0 |
0.0 |
0.0 |
6.5 |
32.8004 |
0.0 |
0.0 |
0.0 |
28.2411 |
0.0 |
0.0 |
0.0 |
160.82 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
7.0 |
45.3586 |
0.0 |
0.0 |
0.0 |
35.3925 |
0.0 |
0.0 |
180.0 |
278.1227 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
7.5 |
41.3604 |
0.0 |
0.0 |
0.0 |
39.2664 |
0.0 |
0.0 |
0.0 |
348.6755 |
0.0 |
0.0 |
180.0 |
0.0 |
0.0 |
8.0 |
28.0587 |
0.0 |
0.0 |
0.0 |
38.8332 |
0.0 |
0.0 |
180.0 |
328.4822 |
0.0 |
0.0 |
180.0 |
0.0 |
0.0 |
8.5 |
15.218 |
0.0 |
0.0 |
180.0 |
34.8606 |
0.0 |
0.0 |
180.0 |
250.3351 |
0.0 |
0.0 |
180.0 |
0.0 |
0.0 |
9.0 |
7.0199 |
0.0 |
0.0 |
0.0 |
29.5961 |
0.0 |
0.0 |
180.0 |
165.8212 |
0.0 |
0.0 |
180.0 |
0.0 |
0.0 |
9.5 |
2.8697 |
0.0 |
0.0 |
0.0 |
24.8258 |
0.0 |
0.0 |
0.0 |
100.6511 |
0.0 |
0.0 |
180.0 |
0.0 |
0.0 |
10.0 |
1.0288 |
0.0 |
0.0 |
0.0 |
21.1913 |
0.0 |
0.0 |
0.0 |
57.0976 |
0.0 |
0.0 |
0.0 |
•The order of translational RAOs is changed from OrcaWave format (Surge, Sway, Heave) to Flexcom format (Heave, Surge, Sway).
•The order of rotational RAOs is changed from OrcaWave format (Roll, Pitch, Yaw) to Flexcom format (Yaw, Roll, Pitch).
•Loads RAO units are converted (typically from kN/m) to N/m (forces) and (typically from kNm/m) to Nm/m (moments).
•Loads QTF units are converted (typically from kN/m^2) to N/m^2 (forces) and (typically from kNm/m^2) to Nm/m^2 (moments).
•Displacements RAO units (rotational degrees of freedom) are converted from rad/m to deg/m.
•Phase angles are converted (typically from radians) to degrees.
•The definition of wave heading is transformed such that a zero degree heading, which is incident on the stern in the OrcaWave format, is incident on the bow in the Flexcom format.
•The phase angle convention in OrcaWave is that positive phase angles are "leading". The OrcaWave phase angles are converted (multiplying by -1) to conform to Flexcom format (i.e. converted from leading to lagging).
•Wave period/frequency values, if not already in Hertz, are converted (from seconds or radians/second) to wave frequency values in Hertz.
Further information may be obtained from the OrcaWave program documentation which is available via the OrcaWave website.