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A smoke generation system for fluid dynamics research
1030
A. Physical Oceanography
case of linear offshore sloping bottom. The flow behavior of the estuarine plume depends on the vertical structure of flow at the river mouth, bottom slope and ambient coastal flow. Under certain conditions, a front exists as an offshore boundary of the plume. Results are compared with observations for the Changjiang River Estuary (China), and Chesapeake Bay and Savannah River estuaries. Inst. of Oceanol., Acad. Sinica, Quindao, People's Republic of China.
A300. Fluid mechanics 87:6754 Dommermuth, D.G. and D.K.P. Yue, 1987. Numerical simulations of nonlinear axisymmetric flows with a free surface. J. Fluid Mech., 178:195-219. A robust, stable numerical method is developed for nonlinear three-dimensional but axisymmetric freesurface problems using a mixed Eulerian-Lagrangian scheme under the assumption of potential flow. Three problems are solved: (1) implementation of a far-field closure; (2) treatment of the body and free-surface intersection line; and (3) stable representation and time integration of the free surface. Computational examples are presented: the growth and collapse of a vapor cavity near the free surface; the heaving of a floating vertical cylinder starting from rest; and the heaving of an inverted vertical cone. Dept. of Ocean Engng, MIT, Cambridge, MA 02139, USA.
87:6755 Grandmaison, E.W., S. Ng and H.A. Becker, 1987. A smoke generation system for fluid dynamics r~,~,earch. J. Phys., scient. Instrums, E, 20(1):605608. A detailed description of a smoke generator system for marker nephelometry, laser velocimetry and flow visualisation research in fluid mechanics is presented. In this system a low-vapour-pressure, commercially available oil is vaporised in a preheated chamber and the carrier gas/vapour stream is rapidly cooled to produce an oil condensation smoke with a particle size in the range of 0.2-2.0 #m. The thermal and process dynamics of the system have sufficiently large time constants to maintain a relatively close control on the smoke concentration.
OLR (1987) 34 (12)
Dept. of Chem. Engng, Queen's Univ., Kingston, ON, K7L 3N6, Canada.
87:6756 Griffiths, R.W. and E.J. Hopfinger, 1987. Coalescing of geostrolflfi¢ vortices. J. Fluid Mech., 178:73-97. Res. School of Earth Sci., Australian Natl. Univ., GPO Box 4, Canberra, ACT 2601, Australia.
87:6757 Hald, O.H., 1987. Convergence of vortex methods for Euler's equations, IH. SIAM J. appl. Math., 24(3):538-552. Dept. of Math., Univ. of Calif., Berkeley, CA 94720, USA.
8"/:6758 London, S.D., 1987. Weakly non-linear Rossby waves in a rotating fluid of Slfl~oidal configuration. Dynam. Atmos. Oceans, 11(1):39-58. A modified ray method is used which yields the same dispersion relation and conservation law as in the linear case, but gives an equation for a new, second order mean term. This mean term is unstable for all free oscillations on any axisymmetric bottom topography in the free surface problem. Dept. of Appl. Math. Sci., Univ. of Houston, 1 Main St., Houston, TX 77002, USA.
87:6759 Melville, W.K. and K.R. Helfrich, 1987. Transcritical two-layer flow over topoffmphy. J. Fluid Mech., 178:31-52. The evolution of weakly-nonlinear two-layer flow over bottom topography is considered. The governing equations are formulated to consider the effects of quadratic and cubic nonlinearity in the transcritical regime of the internal mode. In that regime in which both quadratic and cubic nonlinearity are comparable, evolution of the interface is described by an inhomogeneous extended Korteweg-de Vries equation. MIT, Cambridge, MA 02139, USA.
A. Physical Oceanography
case of linear offshore sloping bottom. The flow behavior of the estuarine plume depends on the vertical structure of flow at the river mouth, bottom slope and ambient coastal flow. Under certain conditions, a front exists as an offshore boundary of the plume. Results are compared with observations for the Changjiang River Estuary (China), and Chesapeake Bay and Savannah River estuaries. Inst. of Oceanol., Acad. Sinica, Quindao, People's Republic of China.
A300. Fluid mechanics 87:6754 Dommermuth, D.G. and D.K.P. Yue, 1987. Numerical simulations of nonlinear axisymmetric flows with a free surface. J. Fluid Mech., 178:195-219. A robust, stable numerical method is developed for nonlinear three-dimensional but axisymmetric freesurface problems using a mixed Eulerian-Lagrangian scheme under the assumption of potential flow. Three problems are solved: (1) implementation of a far-field closure; (2) treatment of the body and free-surface intersection line; and (3) stable representation and time integration of the free surface. Computational examples are presented: the growth and collapse of a vapor cavity near the free surface; the heaving of a floating vertical cylinder starting from rest; and the heaving of an inverted vertical cone. Dept. of Ocean Engng, MIT, Cambridge, MA 02139, USA.
87:6755 Grandmaison, E.W., S. Ng and H.A. Becker, 1987. A smoke generation system for fluid dynamics r~,~,earch. J. Phys., scient. Instrums, E, 20(1):605608. A detailed description of a smoke generator system for marker nephelometry, laser velocimetry and flow visualisation research in fluid mechanics is presented. In this system a low-vapour-pressure, commercially available oil is vaporised in a preheated chamber and the carrier gas/vapour stream is rapidly cooled to produce an oil condensation smoke with a particle size in the range of 0.2-2.0 #m. The thermal and process dynamics of the system have sufficiently large time constants to maintain a relatively close control on the smoke concentration.
OLR (1987) 34 (12)
Dept. of Chem. Engng, Queen's Univ., Kingston, ON, K7L 3N6, Canada.
87:6756 Griffiths, R.W. and E.J. Hopfinger, 1987. Coalescing of geostrolflfi¢ vortices. J. Fluid Mech., 178:73-97. Res. School of Earth Sci., Australian Natl. Univ., GPO Box 4, Canberra, ACT 2601, Australia.
87:6757 Hald, O.H., 1987. Convergence of vortex methods for Euler's equations, IH. SIAM J. appl. Math., 24(3):538-552. Dept. of Math., Univ. of Calif., Berkeley, CA 94720, USA.
8"/:6758 London, S.D., 1987. Weakly non-linear Rossby waves in a rotating fluid of Slfl~oidal configuration. Dynam. Atmos. Oceans, 11(1):39-58. A modified ray method is used which yields the same dispersion relation and conservation law as in the linear case, but gives an equation for a new, second order mean term. This mean term is unstable for all free oscillations on any axisymmetric bottom topography in the free surface problem. Dept. of Appl. Math. Sci., Univ. of Houston, 1 Main St., Houston, TX 77002, USA.
87:6759 Melville, W.K. and K.R. Helfrich, 1987. Transcritical two-layer flow over topoffmphy. J. Fluid Mech., 178:31-52. The evolution of weakly-nonlinear two-layer flow over bottom topography is considered. The governing equations are formulated to consider the effects of quadratic and cubic nonlinearity in the transcritical regime of the internal mode. In that regime in which both quadratic and cubic nonlinearity are comparable, evolution of the interface is described by an inhomogeneous extended Korteweg-de Vries equation. MIT, Cambridge, MA 02139, USA.