740 OLR (1987)34(9) 87:4935 Wilmott, P., 1987. On the motion of a small two-dimensional body submerged beneath surface waves. J. Fluid Mech., 176:465-481. The problem of a body submerged beneath a free surface is considered; flow is two-dimensional and the cross-section of the body and its motion are arbitrary. In the limit as a typical body dimension becomes small compared with its depth the method of matched asymptotic expansions becomes appli- cable and expressions for the forces and moment experienced by the body can be found. Several cases are considered in detail where the body is permitted to move in response to the forces and moment. We also find the additional forces, due to the free surface, experienced by a lifting body. Math. Inst., Univ. of Oxford, 24/29 St Giles, Oxford, OX1 3LB, UK. 87:4936 Yoshida, Atsushi and J.E. Hart, 1986. A numerical study of baroclinic chaos. Geophys. astrophys. Fluid Dynam., 37(1-2):1-56. E.K. InfoSystems, 6142 Peachtree St., Commerce, CA 90040, USA. A330. Books, collections (general) 87:4937 Parrish, B.B. (ed.), 1986. [Northern oceans: hydro- graphic and biological] information for the year 1984. A nnls biol., Copenh., 41:196pp; 96 papers. The volume is divided into four sections: hydrog- raphy-20 contributions and an introduction to conditions in the North Atlantic, the North Sea, and the Baltic: plankton--10 contributions and an introduction to the phyto- and zooplankton of the region including phytoplankton blooms in the ICES area: the fish--60 contributions on exploited stocks of gadoid fish (cod, haddock, whiting, saithe, ling, and polar cod), clupeoid fish (herring and sprat), scombriform fish (mackerel), flatfish, other fish (including redfish, grenadiers, by-catch, and rare fish): and marine mammals. Joint investigations from the International O-Group Fish Survey in the Barents Sea and adjacent waters for 1982-84, including O-Group fish distribution and sea tem- peratures in Icelandic and East Greenland waters, and herring data from International Young Fish Survey in the North Sea, Skagerrak and Kattegat for 1984 are also covered. (hbf) B. MARINE METEOROLOGY BI0. Apparatus and methods 87:4938 Bradley, S.G., S.R. Green and C.D. Stow, 1987. A low-cost satellite image reception and analysis facility. Part I. Objectives, image reception and data management. Weather, 42(3):77-85. Satellite-generated image reception and integration used to require expensive receivers and main-frame computers, but a new generation of powerful microcomputers makes possible 'the design and construction of an entire reception and analysis system' by anyone 'with only modest skills in electronics and computing.' This opens the door to direct data access and real-time capabilities to university departments, field stations and amateurs. Such a system is described here. Dept. of Phys., Univ. of Auckland, Auckland, New Zealand. (fcs) 87:4939 Finkelstein, P.L., J.C. Kaimal, J.E. Gaynor, M.E. Graves and T.J. Lockhart, 1986. Comparison of wind monitoring systems. Part I. In-situ sensors. J. atmos, ocean. Technol., 3(4):583-593. Two categories of sensors were tested at the Boulder Atmospheric Observatory. One consisted of light- weight in-situ sensors of types frequently used for boundary layer studies. The other category consisted of four commercially available Doppler sodars, with the capability to measure wind speed, wind direc- tion, and vertical component of turbulence, at various heights above the ground. The systems were compared with a 3-axis sonic anemometer; discussed in this paper are statistical measures of their accuracy, precision and spectral response to fluc- tuations in the wind. Environ. Protection Agcy., Res. Triangle Park, NC 27711, USA.

On the motion of a small two-dimensional body submerged beneath surface waves

Download PDF Report

Upload
duonglien
View
216
Download
0

Embed Size (px)

Citation preview

Page 1: On the motion of a small two-dimensional body submerged beneath surface waves

740 OLR (1987)34(9)

87:4935 Wilmott, P., 1987. On the motion of a small

two-dimensional body submerged beneath surface waves. J. Fluid Mech., 176:465-481.

The problem of a body submerged beneath a free surface is considered; flow is two-dimensional and the cross-section of the body and its motion are arbitrary. In the limit as a typical body dimension becomes small compared with its depth the method of matched asymptotic expansions becomes appli- cable and expressions for the forces and moment experienced by the body can be found. Several cases are considered in detail where the body is permitted to move in response to the forces and moment. We also find the additional forces, due to the free surface, experienced by a lifting body. Math. Inst., Univ. of Oxford, 24/29 St Giles, Oxford, OX1 3LB, UK.

87:4936 Yoshida, Atsushi and J.E. Hart, 1986. A numerical

study of baroclinic chaos. Geophys. astrophys. Fluid Dynam., 37(1-2):1-56. E.K. InfoSystems, 6142 Peachtree St., Commerce, CA 90040, USA.

A330. Books, collections (general) 87:4937

Parrish, B.B. (ed.), 1986. [Northern oceans: hydro- graphic and biological] information for the year 1984. A nnls biol., Copenh., 41:196pp; 96 papers.

The volume is divided into four sections: hydrog- r aphy-20 contributions and an introduction to conditions in the North Atlantic, the North Sea, and the Baltic: plankton--10 contributions and an introduction to the phyto- and zooplankton of the region including phytoplankton blooms in the ICES area: the fish--60 contributions on exploited stocks of gadoid fish (cod, haddock, whiting, saithe, ling, and polar cod), clupeoid fish (herring and sprat), scombriform fish (mackerel), flatfish, other fish (including redfish, grenadiers, by-catch, and rare fish): and marine mammals. Joint investigations from the International O-Group Fish Survey in the Barents Sea and adjacent waters for 1982-84, including O-Group fish distribution and sea tem- peratures in Icelandic and East Greenland waters, and herring data from International Young Fish Survey in the North Sea, Skagerrak and Kattegat for 1984 are also covered. (hbf)

B. MARINE METEOROLOGY

BI0. Apparatus and methods

87:4938 Bradley, S.G., S.R. Green and C.D. Stow, 1987. A

low-cost satellite image reception and analysis facility. Part I. Objectives, image reception and data management. Weather, 42(3):77-85.

Satellite-generated image reception and integration used to require expensive receivers and main-frame computers, but a new generation of powerful microcomputers makes possible 'the design and construction of an entire reception and analysis system' by anyone 'with only modest skills in electronics and computing.' This opens the door to direct data access and real-time capabilities to university departments, field stations and amateurs. Such a system is described here. Dept. of Phys., Univ. of Auckland, Auckland, New Zealand. (fcs)

87:4939 Finkelstein, P.L., J.C. Kaimal, J.E. Gaynor, M.E.

Graves and T.J. Lockhart, 1986. Comparison of wind monitoring systems. Part I. In-situ sensors. J. atmos, ocean. Technol., 3(4):583-593.

Two categories of sensors were tested at the Boulder Atmospheric Observatory. One consisted of light- weight in-situ sensors of types frequently used for boundary layer studies. The other category consisted of four commercially available Doppler sodars, with the capability to measure wind speed, wind direc- tion, and vertical component of turbulence, at various heights above the ground. The systems were compared with a 3-axis sonic anemometer; discussed in this paper are statistical measures of their accuracy, precision and spectral response to fluc- tuations in the wind. Environ. Protection Agcy., Res. Triangle Park, NC 27711, USA.