2012 Fiscal Year Final Research Report
Theoretical study of the relationship between frictional resistance and surface roughness using DNS and accurate measurement systems
| Project/Area Number |
22246112
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Naval and maritime engineering
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| Research Institution | National Maritime Research Institute |
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Principal Investigator |
KAWASHIMA Hideki 独立行政法人海上技術安全研究所, EEDIプロジェクトチーム, 上席研究員 (20450679)
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| Co-Investigator(Kenkyū-buntansha) |
KAWAGUCHI Yasuo 東京理科大学, 理工学部, 教授 (20356835)
TSUJI Yoshiyuki 名古屋大学, 工学研究科, 教授 (00252255)
IWAMOTO Kaoru 東京農工大学, 工学研究科, 教授 (50408712)
HORI Toshihumi 海上技術安全研究所, その他部局等, 研究員 (50505104)
MAKINO Masashiko 海上技術安全研究所, 流体設計系, 主任研究員 (90415795)
FUKASAWA Ryouhei 海上技術安全研究所, 流体設計系, 研究員 (80505107)
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| Project Period (FY) |
2010 – 2012
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| Keywords | 乱流摩擦抵抗 / 粗度形状パラメータ / 幾何形状粗度 / 水槽試験 / DNS / 二重円筒試験 / 風洞試験 / 流場計測 |
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| Research Abstract |
In order to investigate the relationship between the turbulent frictional resistance and roughness shape parameters, parametrical study of geometrical roughness was carried out using DNS, double cylinder test, towing tank test, the wind tunnel test. As a result, in the case of wavy rough surface, turbulent frictional resistance of the rough surface is the sum of the local pressure resistance and shear forces, changes in the turbulent frictional resistance it can be explained by changes in local pressure resistance of the roughness, the local pressure resistance is governed drag coefficient which depends on the profile of the roughness, the interference phenomenon of roughness between that depends on the spacing of roughness, the velocity distribution in the boundary layer. Then the relational expression between turbulent frictional resistance and roughness shape parameters have been derived for estimating frictional resistance increase on the rough surface.
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