1*WNN(QTO&GUKIP7VKNK\KPI%(&HQT
+ORTQXGOGPVQH''&+Y, Kasahara
EEDI Project-TeamNational Maritime Research InstituteᲦJAPANInternational Workshop on Shipp Technologies Related
d to Energy Efficiency Design Index (EEDI)

Outline
1. EEDI places restriction on CO2 emissions- Required EEDI reviewed every other 5-years
2. Refine ship form and brush up energy saving devices
3. Utilizing CFD is essential for them
3.1 Resistance computation
3.2 Self-propulsion computation
3.3 Energy saving devices computation
4. Apply the grid-blending method to hull form design
5. Conclusion
23

Principal Dimensions

Lwl [m]

82DWT
BC
225.0

33DWT
ChemicalTanker
173.0

Lpp [m]
B [m]
d [m]

222.0
32.26
12.2

170.5
27.7
10.0

Cb [-]
Dp [m]Vs [knot]Design Fr (Lwl)

0.871
6.40
14.2
0.15

0.795
6.60
14.5
0.18

Comparison of Grid Fore-Part
HullDes & GRIDGEN ®
HullDes

GRIDGEN ®

4

%QORCTKUQPQH)TKF#HV2CTV*WNN&GU )4+&)'0 ᶳ
HullDes

GRIDGEN ®

56QVCN4GUKUVCPEG%QORWVKPI &96 $%Comparison of Total Resisitance Coefficients Between CFD and Tank-Test
TankTest

Neptune_HullDes

Ctm_Temp=15.0
Ctm_Temp=15.0
OO-SURF_GridGen®
HO-Neptune_HullDes
OO-SURF_HullDes

5.0E-03

Total Resisitance Coefficient
Total Resistance Coefficient

5.0E-03
4.5E-03
4.5E-03
4.0E-03
4.0E-03
3.5E-03
3.5E-033.0E-033.0E-03
2.5E-03
2.5E-032.0E-032.0E-03
1.5E-03
1.5E-03
1.0E-03
1.0E-035.0E-04
5.0E-04

0.0E+00㻜㻚㻜㻤
0.0E+00㻜㻚㻜㻥㻜㻚㻜㻤㻜㻚㻝㻜㻜㻚㻜㻥㻜㻚㻝㻜㻚㻝㻝㻜㻚㻝㻝㻜㻚㻝㻞㻜㻚㻝㻞㻜㻚㻝㻟㻜㻚㻝㻟㻜㻚㻝㻠㻜㻚㻝㻠Fr
Froude number㻜㻚㻝㻡㻜㻚㻝㻡㻜㻚㻝㻢
㻜㻚㻝㻢

㻜㻚㻝㻣
㻜㻚㻝㻣

㻜㻚㻝㻤㻜㻚㻝㻤

6

7%QORWVCVKQP%QPFKVKQPU
TankTest
Fr

0.155

68.35

Rn×10

CFD_2

CFD_10.154

CFD_70.154

9.00

CFD_3

0.155

9.00

CFD_4

0.155

8.35

CFD_50.155

8.35

CFD_60.155

8.35

0.155

8.35

8.35

Topology

H-O

O-O

O-O

O-O

O-O

O-O

O-O

Total_cell

931,840

609,280

609,280

847,000

847,000

847,000

609,280

grid

HullDesMin. Grid Space×10-6

HullDes

1.69

HullDes

2.36

Gridgen

0.301

Gridgen0.301

Gridgen

0.301

HullDes

0.301

0.301

Solver

NeptuneNeptuneNeptuneNeptuneNeptune

SURF

SURF

Free Surface Model

Tracking

Tracking

Tracking

Level Set

Level Set

Level Set

Level Set

Turbulence Model

Mod_SA

Mod_SASASA

Mod_SA

SA

SA

10

1000

1000

Total Resistance Coeff.×10-3

cvor
4.138

3.76173.85793.89324.27144.25064.16084.1859

CTM/TankTest

1.000

0.909

0.932

0.941

1.032

1.027

1.006

1.012

(QTO(CEVQT
Prohaska’s Method
Tank Result 1+k= 1.286

CFD Result 1+k= 1.280

㻝㻚㻡㻜㻝㻚㻡㻜㻯㼀㻛㻯㻲㻝㻚㻠㻡㻝㻚㻠㻜㻝㻚㻠㻜㻝㻚㻟㻡㻝㻚㻟㻡㻯㼀㻛㻯㻲㻝㻚㻟㻜㼥㻌㻩㻌㻜㻚㻠㻟㻝㻤㼤㻌㻗㻌㻝㻚㻞㻤㻡㻥㻝㻚㻞㻡㻯㼀㻛㻯㻲㻝㻚㻟㻜㼟㼑㼘㼑㼏㼠㼟㼑㼘㼑㼏㼠㻝㻚㻞㻡㼥㻌㻩㻌㻜㻚㻞㻟㻝㻠㼤㻌㻗㻌㻝㻚㻞㻤㻜㻝⥺ᙧ㻔㼟㼑㼘㼑㼏㼠㻕㻝㻚㻞㻜⥺ᙧ㻔㼟㼑㼘㼑㼏㼠㻕㻝㻚㻞㻜㻝㻚㻝㻡㻝㻚㻝㻜㻯㼀㻛㻯㻲㻝㻚㻠㻡㻝㻚㻝㻡㻲㼚㻠㻛㻯㻲㻜㻚㻜㻜㻜㻚㻜㻡㻜㻚㻝㻜㻜㻚㻝㻡㻜㻚㻞㻜㻜㻚㻞㻡㻜㻚㻟㻜㻝㻚㻝㻜㻲㼚㻠㻛㻯㻲㻜㻚㻜㻜㻜㻚㻜㻡㻜㻚㻝㻜㻜㻚㻝㻡㻜㻚㻞㻜㻜㻚㻞㻡㻜㻚㻟㻜

89%QORCTKUQPQH4GUKFWCN4GUKUVCPEG
DGVYGGP(KPGITKF%(&CPF6CPM6GUV4GUWNVU%QORCTKUQPQH%QORWVCVKQP)TKFDGVYGGP5VCPFCTFCPF(KPG)TKF

Standard grid
131*77*81=817,047 cells

Fine grid
225*89*145=2,903,625 cells

10%QORCTKUQPQH9CXG2CVVGTP
DGVYGGP%(&5VCPFCTF)TKFCPF%(&(KPG)TKF

standard gridfine grid11

0.780.790.800.810.820.830.840.850.860.870.88

CFD

EXP

EtaR

HexpressኒЗ20.88
0.87
0.86
0.85
0.84
0.83
0.82
0.81
0.80
0.79
0.78

EXP

EXP

1-t

5GNH2TQRWNUKQP%QORWVKPI

ኒЗ2Hexpress

1.05
1.04
1.03
1.02
1.01
1.00
0.99
0.98
0.97
0.96
0.95
0.95 0.96 0.97 0.98 0.99 1.00 1.01 1.02 1.03 1.04 1.05

CFD

1-wt

ኒЗ2Hexpressዴ࢟ (ኒЗ2)

0.76
0.74
0.72
0.70
0.68
0.66
0.64
0.62
0.60
0.58
0.56
0.54
0.520.50

Ź :Ţ ᲴSolverᲴNeptune
Grid ᲴHULDESᲦ

931,840 cells

SolverᲴSurf
Grid ᲴHEXPRESS@, 3,930,000 cells

0.54 0.56 0.58 0.60 0.62 0.64 0.66 0.68 0.70

CFD

12

3.3 Energy Saving Devices Computation)TKF *WNN 4WFFGT 'PGTI[5CXKPI&GXKEG
*':24'55 ᶳ᳕6QVCNEGNNU᳸/KNNKQP᳗

135GNH2TQRWNUKQP%QORWVKPI YKVJ'5&㻝㻙㼠㻱㼤㼜㻚㻜㻚㻥㻜㻜㻚㻤㻜㻜㻚㻣㻜㻜㻚㻢㻜㻜㻚㻡㻜㻜㻚㻠㻜㻜㻚㻟㻜㻜㻚㻞㻜㻜㻚㻝㻜㻜㻚㻜㻜㻾㼡㼐㼐㼑㼞 㻾㼡㼐㼐㼑㼞 㻾㼡㼐㼐㼑㼞 㻾㼡㼐㼐㼑㼞 㻾㼡㼐㼐㼑㼞 㻾㼡㼐㼐㼑㼞㼃㻭㻰㻜 㼃㻭㻰㻝 㼃㻭㻰㻞 㼃㻭㻰㻟 㼃㻭㻰㻠㻝㻙㼣㼠㻱㼤㼜㻚㼑㼠㼍㻾㻯㻲㻰㻱㼤㼜㻚㻯㻲㻰㻝㻚㻜㻠㻝㻚㻜㻟㻝㻚㻜㻞㻝㻚㻜㻝㻝㻚㻜㻜㻜㻚㻥㻥㻜㻚㻥㻤㻜㻚㻥㻣㻜㻚㻥㻢㻜㻚㻥㻡㻜㻚㻥㻠㻾㼡㼐㼐㼑㼞 㻾㼡㼐㼐㼑㼞 㻾㼡㼐㼐㼑㼞 㻾㼡㼐㼐㼑㼞 㻾㼡㼐㼐㼑㼞 㻾㼡㼐㼐㼑㼞㼃㻭㻰㻜 㼃㻭㻰㻝 㼃㻭㻰㻞 㼃㻭㻰㻟 㼃㻭㻰㻠㻯㻲㻰㻜㻚㻢㻡㻜㻚㻢㻜㻜㻚㻡㻡㻜㻚㻡㻜㻜㻚㻠㻡㻜㻚㻠㻜㻜㻚㻟㻡㻜㻚㻟㻜㻜㻚㻞㻡㻜㻚㻞㻜㻜㻚㻝㻡㻜㻚㻝㻜㻜㻚㻜㻡㻜㻚㻜㻜㻾㼡㼐㼐㼑㼞 㻾㼡㼐㼐㼑㼞 㻾㼡㼐㼐㼑㼞 㻾㼡㼐㼐㼑㼞 㻾㼡㼐㼐㼑㼞 㻾㼡㼐㼐㼑㼞㼃㻭㻰㻜 㼃㻭㻰㻝 㼃㻭㻰㻞 㼃㻭㻰㻟 㼃㻭㻰㻠

14

15

'UVKOCVKQPQH9CMGICKPD['5&㻙㻜㻚㻝㻝 㻙㻜㻚㻝㻜 㻙㻜㻚㻜㻥 㻙㻜㻚㻜㻤 㻙㻜㻚㻜㻣 㻙㻜㻚㻜㻢 㻙㻜㻚㻜㻡 㻙㻜㻚㻜㻠 㻙㻜㻚㻜㻟 㻙㻜㻚㻜㻞 㻙㻜㻚㻜㻝 㻜㻚㻜㻜㻜㻚㻜㻜䂴㻔㻝㻙㼣㼚㻕㼋㻯㻲㻰㻙㻜㻚㻜㻝㻙㻜㻚㻜㻞䂴㻔㻝㻙㼣㼠㻕㼋㻱㼤㼜㻙㻜㻚㻜㻟㻙㻜㻚㻜㻠㻙㻜㻚㻜㻡㻙㻜㻚㻜㻢㻙㻜㻚㻜㻣㼥㻌㻩㻌㻜㻚㻠㻞㻠㻟㼤㻌㻙 㻜㻚㻜㻜㻣㻡㻾㼽㻌㻩㻌㻜㻚㻤㻝㻠㻥㻙㻜㻚㻜㻤㻙㻜㻚㻜㻥㻙㻜㻚㻝㻜1 െ ‫ ்ݓ‬ாௌ஽ = 1 െ ‫ ்ݓ‬௪௜௧௛௢௨௧ + ο 1 െ ‫ ்ݓ‬ாௌ஽
ο 1 െ ‫ ்ݓ‬ாௌ஽ = 0.4243 ×1 െ ‫ݓ‬௡ ௪௜௧௛௢௨௧_஼ி஽ െ 1 െ ‫ݓ‬௡ ாௌ஽_஼ி஽ െ 0.0075'UVKOCVKQPQH Y6 YKVJ'5&㻝㻙㼣㼠㻱㼤㼜㻚㻝㻙㼣㼠㻯㻲㻰㻜㻚㻢㻡㻜㻚㻢㻜㻜㻚㻡㻡㻜㻚㻡㻜㻜㻚㻠㻡㻜㻚㻠㻜㻜㻚㻟㻡㻜㻚㻟㻜㻜㻚㻞㻡㻜㻚㻞㻜㻜㻚㻝㻡㻜㻚㻝㻜㻜㻚㻜㻡㻜㻚㻜㻜㻾㼡㼐㼐㼑㼞 㻾㼡㼐㼐㼑㼞 㻾㼡㼐㼐㼑㼞 㻾㼡㼐㼐㼑㼞 㻾㼡㼐㼐㼑㼞 㻾㼡㼐㼐㼑㼞㼃㻭㻰㻜 㼃㻭㻰㻝 㼃㻭㻰㻞 㼃㻭㻰㻟 㼃㻭㻰㻠㻱㼤㼜㻚㻯㻲㻰㻙䏓㻔㻝㻙㼣㼚㻕㻜㻚㻢㻡㻜㻚㻢㻜㻜㻚㻡㻡㻜㻚㻡㻜㻜㻚㻠㻡㻜㻚㻠㻜㻜㻚㻟㻡㻜㻚㻟㻜㻜㻚㻞㻡㻜㻚㻞㻜㻜㻚㻝㻡㻜㻚㻝㻜㻜㻚㻜㻡㻜㻚㻜㻜㻾㼡㼐㼐㼑㼞 㻾㼡㼐㼐㼑㼞 㻾㼡㼐㼐㼑㼞 㻾㼡㼐㼐㼑㼞 㻾㼡㼐㼐㼑㼞 㻾㼡㼐㼐㼑㼞㼃㻭㻰㻜 㼃㻭㻰㻝 㼃㻭㻰㻞 㼃㻭㻰㻟 㼃㻭㻰㻠

16

17

4. Apply the grid-blending method to hull form designȷadopt the grid-blending(morphing) method for CFD-gridȷfore-body are same.
ȷapply this method to variation from V-type aft-body to U-type aft-bodyȷ200 ships

8CTKCVKQPUKP(NQY(KGNF
.KOKVKPI5VTGCONKPGUCPF2TGUUWTG&KUVTKDWVKQPȷAs Aft Body become from V-type to U-type,area moves aft and expands to upper-side.

negative pressure

18

8CTKCVKQPUKP(NQY(KGNF
.KOKVKPI5VTGCONKPGUCPF8QTVKEGU%QPVQWTU

19Pressure Difference Contour between
Resistance and Self-Propulsion Condition20ȷ+&CHVDQF[ HTQOITKFDNGPFKPIOGVJQF
ȷ/5VCPMVGUVOQFGNȷUCOG TGUKUVCPEGXCNWG/5 CPF+&

21%QORCTKUQPQH#HV$QF[RNCP DGVYGGP/5 CPF+&22

%QORCTKUQPQH.KOKVKPI5VTGCONKPGUCPF2TGUUWTG%QPVQWTU
DGVYGGP/5 CPF+&

MS857

ID066

23%QORCTKUQPQH.KOKVKPI5VTGCONKPGUCPF8QTVKEGU%QPVQWTU
DGVYGGP/5 CPF+&

MS857

ID066

24

5. Conclusion
3.1
・Resistance computational results by using CFD almost attains Numerical
Towing Tank.
・The quality of computational results depend on grid generation and CFDparameter setup.
3.2
・Self-propulsion computational results by using CFD is close to be a tool for
estimating propulsion performance.
・Estimation by using CFD is carried out in comparison with tank test results
carefully.
4・The grid-blending(morphing) method is favorable tool for the hull
design.
2533DWT

Chemical Tanker

ItemValueUnit

EEDI

5.43g/(tonNM) Attained Energy Efficiency Design Index

EEDIref

7.60

g/(tonNM) Reference value of Energy Efficiency Design Index

REEDI

28.6%

Remarks

Reduction rate of EEDI26

6JCPM[QWHQT[QWTCVVGPVKQP

27