Showing papers on "Volume of fluid method published in 1980"

SOLA-VOF: a solution algorithm for transient fluid flow with multiple free boundaries

Abstract: In this report a simple, but powerful, computer program is presented for the solution of two-dimensional transient fluid flow with free boundaries The SOLA-VOF program, which is based on the concept of a fractional volume of fluid (VOF), is more flexible and efficient than other methods for treating arbitrary free boundaries SOLA-VOF has a variety of user options that provide capabilities for a wide range of applications Its basic mode of operation is for single fluid calculations having multiple free surfaces However, SOLA-VOF can also be used for calculations involving two fluids separated by a sharp interface In either case, the fluids may be treated as incompressible or as having limited compressibility Surface tension forces with wall adhesion are permitted in both cases Internal obstacles may be defined by blocking out any desired combination of cells in the mesh, which is composed of rectangular cells of variable size SOLA-VOF is an easy-to-use program Its logical parts are isolated in separate subroutines, and numerous special features have been included to simplify its operation, such as an automatic time-step control, a flexible mesh generator, extensive output capabilities, a variety of optional boundary conditions, and instructive internal documentation

Breast measuring apparatus

Abstract: Apparatus for use in estimating the volume of a human breast includes a cup which substantially covers the breast and is lined with a flexible membrane, the membrane defining a space within the cup and the space being coupled to a fluid container having means to vary the volume of fluid within the container, and for indicating changes in the volume of fluid within the container, whereby variations in volume of fluid in the said space result in corresponding variations in volume of fluid within the container.

Continuous volume measuring system

Abstract: A continuous volume measuring device for measuring the cumulative volume of a flowing fluid. The device includes a pair of coupled expandable chambers, and the fluid flow is directed into a first chamber to expand it while the second chamber is contracting and expelling liquid therefrom, the expansion of the first chamber being measured to determine the volume of fluid being received therein. When a predetermined volume of liquid is received, a valve means diverts the fluid flow to fill the second chamber, the expansion of which is similarly measured, and the first chamber is emptied. In the preferred embodiment, the chambers are precision syringes.

Shear-Thinning Effects in Creeping Flow about a Sphere

Abstract: Shear-thinning inelastic fluid behaviour is often described by the power law because of the simplicity of this model. Frequently also zero shear viscosity is difficult to measure and so a more realistic fluid model cannot be used. Despite the severe limitations of the power law in describing regions of a flow field where the shear rate approaches zero, it continues to be applied to the problem of creeping sphere motion. It has not yet been determined over what proportion of the sphere surface this fluid model breaks down. Presumably if the areas of the sphere surface about the front and rear stagnation points and the volume of fluid far from the sphere do not contribute significantly to the total drag of a sphere, then a power law description of the flow field may yield an acceptable result for the drag.

Apparatus for calibrating fluid flow meters utilizing digital techniques

Abstract: Apparatus for calibrating a fluid flow meter includes a meter prover for detecting a known volume of fluid through the meter including a chamber of known volume, a piston to be moved rectilinearly within the chamber and a motor driving the piston, the chamber being coupled to the fluid flow meter under test to permit the flow of fluid between the fluid flow meter and the chamber. A rotary encoder coupled to the fluid flow meter provides a first indication in the form of a first series of pulses indicative of the fluid flow as measured by the meter. A high precision linear encoder coupled to the meter prover responsive to the movement of the piston provides a second indication in the form of a second series of pulses indicative of the fluid drawn by the meter prover through the fluid flow meter. A control microprocessor is responsive to the movement of the piston to enable the accumulation of the outputs of the two encoders whereby the accumulated value or number of the second series of pulses provides a calibrated, precise manifestation of the fluid flow through the fluid flow meter as measured by the meter prover.

Apparatus for testing the volume of fluid medium flowing through variable cross-section throttle

Abstract: This invention is an apparatus for testing the volume of a fluid medium flowing through a variable cross-section throttling point, such as the air throttle duct of a carburetor for an internal combustion engine. The fluid medium to be tested enters a primary duct of the present invention which has an input pressure regulator followed by two constant cross-section nozzles through which the fluid medium must pass. A flow branch duct which includes a second pressure regulator and the flow device intersects the primary duct for fluid transmission at a point between the two nozzles. The second pressure regulator is at the input to the test device. A pressure gauge is provided at the intersection of the main duct and branch duct. The indicated pressure is inversely proportional to the fluid flow volume through the test device.