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Drag Reduction
Project |
ReNew at 2000.07.07
1.Topics of The Research Group |
| This drag reduction project was started at April 1995.
Following research projects are related to the drag reduction project.
- Reduction of hydrodynamic drag of ships using CFD
(1995-2000, Ship Research Institute)
- Optimum design method of hydrodynamic shape for ship hulls by CFD [SR229]
(1995-1999, Joint project of Ship Research Institute, Shipbuilding research association of Japan, shipbuilding makers, computer software makers and univercities)
- Reduction of frictional drag of ships [SR239]
(1998-2002, Joint project of Ship Research Institute, Shipbuilding research association of Japan, shipbuilding makers, marine paint makers and univercities)
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Macro-approach of a drag reduction is researching to
deveropment of hydrodynamic shape optimization system
for ship hulls by CFD.
Micro-approach of a drag reduction is researching to the mechanism of turbulent flow
and drag in a boundary layer around a ship hull. The drag reduction devices are
microbubbles (pdf file 289KB)
and LEBU.
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Drag Reduction
- Y.Kodama,"Research on the Reduction in Ship Resistance by means of CFD
in the Next Generation",66th General Meeting of SRI,1995.11
- T.Hino,"Towards Drag Reduction by Hull Form Optimization",
68th General Meeting of SRI,1996.12
- A.Kakugawa,Y.Kodama,"Experimental Study of Drag Reduction Devices"
, 68th General Meeting of SRI,1996.12
- Y.Kodama," State of the Art of Devices for Drag Reduction",
70th General Meeting of SRI,1997.12
Microbubbles
- T.Takahashi et. al.,"Drag Reduction Experiment by means of Micro Air Bubbles
Using a Ship Model with a Flat Bottom",66th General Meeting of SRI,1995.11
- F.Larrarte, Y.Kodama,"Study of the Trajectory of Micro Air Bubbles around
Geosim Ship Models",66th General Meeting of SRI,1995.11
- T.Takahashi et. al.,"Experimental Drag Reduction of Model Ships Using Bubbles",
28th Fluid Dynamics Conference,1996.10
- H.Kawashima,"The Size of Bubbles Genarated in the Wall Boundary Layer",
28th Fluid Dynamics Conference,1996.10
- H.Kawashima, et. al.,"A Small High-Speed Tunnel for Drag Reduction Testing
Using Microbubbles",, 68th General Meeting of SRI,1996.12
- F. LARRARTE, Y. KODAMA,"Trajectory of bubbles under a ship hull and scale effects."
Journal of the Kansai Society of Naval Architects, Japan No.227, March,1997
- Kawashima et. al,"Measurement of Air Bubble Shear Stress Reduction",
ONR workshop 97,1997.2
- T.Takahashi et. al.,"Local Skin Friction Reduction Using Microbubbles",
Journal of the Kansai Society of Naval Architects, Japan No.228, September,1997
- A.Kakugawa, T.Takahashi,
"PIV Measurement of Microbubble Flows", 25th Visualization Symposium, 1997.7
- T.Takahashi,Kakugawa,Kodama,
"Streamwise Distribution of the Skin Friction Reduction by Microbubbles",
J. of the Society of Naval Architects of Japan Vol.182,1997.11
- A.Kakugawa,et.al.,"The Effect of Microbubble Distributions on Drag Reduction",
70th General Meeting of SRI,1997.12
- A.Kakugawa,et.al.,"Measurements of Flows with High Density Microbubbles Using PIV",
70th General Meeting of SRI,1997.12
- H.Kawashima et al.,
"A Relation between Drag Reduction and the Distribution of Microbubbles",
ONR workshop 98,1998.2 (pdf file 66KB)
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Y.Kodama,"Effect of Microbubbles Distribution on Skin Friction Reduction",
International Symposium on Seawater Drag Reduction, 1998.7 (pdf file 289KB)
- H.Kawashima et al.,"A Relation Between Frictional Drag Reduction
by Microbubbles and Local Void Ratios",30th Symposium on Fluid Dynamics, 1998.9
- A.Kakugawa,et.al.,"Velocity Measurements of Flow Field With Microbubbles
Using PIV",256th Kansai-meeting of JSME,1998.10
- H.Kawashima et al.,"Frictional Drag Reduction by Microbubbles
(Effect of Local Void Ratios)",NAL Symposium,1998.10
- H.Kawashima et al.,
"A Relation Between Frictional Drag Reduction by Microbubbles and Local Void Ratios",
72th General Meeting of SRI,1998.12 (pdf file 89KB)
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A.Kakugawa,"Measurement of Velocity Distribution in a Tunnel Flow with Microbubbles
Using PIV",72th General Meeting of SRI,1998.12
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A.Kakugawa, et al.,"Velocity Measurements of Flows with Microbubbles Using PIV",
ATEM'99 JSME,Ube city,Japan, 1999.7
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T.Takahashi,et al."Experimental skin friction reduction by microbubbles using
a ship with a flat bottom", 31st Sympo. on Turbulence Flow ,Tokyo, 1999.7
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T.Takahashi,et al."A Brief Report on Microbubble Experiments Using 50m-Long Flat Plate Ship",
74th General Meeting of SRI,2000.06
LEBU
- M.Hinatsu,"Numerical Simulation of Channel Flow with Micro Air Bubbles
Using Large Eddy Simulation",66th General Meeting of SRI,1995.11
- M.Hinatsu,"Numerical Simulation of Flow around LEBUs",
68th General Meeting of SRI,1996.12
- A.Sowdon, M.Makino,"Wind Tunnel Measurement of a Flat Plate Boundary Layer
for Future LEBU Applications", 68th General Meeting of SRI,1996.12
- A.Sowdon,"The Use of a Circular Cylinder as a LEBU Device",
70th General Meeting of SRI,1997.12
- M.Hinatsu, et.al.,"Large-Eddy Simulation
around a LEBU Drag Reduction Device",1st Numerical Towing Tank Conference, Hamburg,
1998.9 (pdf file 176KB)
- A.Sowdon,"Investigation into the Use of
a Flat Plate as a Drag Reduction Device",72th General Meeting of SRI,1998.12
- M.Hinatsu,"Numerical Simulation
of Flow around a LEBU using LES",72th General Meeting of SRI,1998.12 (pdf file 240KB)
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Mail to kakugawa@srimot.go.jp
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