Aerodynamics the study of the flow of gases

Aerostatic Pertains to the study of gases at rest.

Bathymetry The study of water depths.

Bernoulli’s equation describes the behaviour of moving fluids along a streamline

Boundary layer the layer of fluid in the immediate vicinity of a bounding surface

Capillary A narrow tube or confined flow channel.

Coanda effects the tendency of a stream of fluid to stay attached to a convex surface, rather than follow a straight line in its original direction.

Compressibility effects significant density changes caused by the flow of a gas.

Continuum approximation assuming the substance under question is a continuum

Density The mass of fluid per unit volume.

Dilatant In fluid mechanics means shear thickening.

Drag force the force a flowing fluid exerts on a body in the flow direction.

Flow coefficient The difference between the flow coefficient Cv and Kv.

Flow energy The flow energy is associated with fluid that enters or leaves a control volume.

Homogenous fluid A fluid of constant density.

Hydraulics a branch of science and engineering concerned with the use of liquids to perform mechanical tasks.

Hydrodynamics the fluid dynamics applied to liquids, such as water, alcohol, and oil.

Hydrostatics Pertains to the study of liquids at rest.

Inviscid Not viscous

Lift force Lift consists of the sum of all the aerodynamic forces normal to the direction of the external airflow.

Meniscus The curved free surface of a liquid in a capillary tube.

Newtonian fluid a viscous fluid whose shear stresses are a linear function of the fluid strain rate.

perfect fluid defined as a fluid with zero viscosity

Pitching moment he moment about the side force direction.

Pitot tube a small tube with its open end aligned into the flow so as to sense the full impact pressure of the flowing fluid. It measures

the stagnation pressure.

Pseudo plastic Shear-thinning.

Richardson number A dimensionless number that expresses the ratio of potential to kinetic energy.

Rotary current A tidal current that changes direction progressively through 360 degrees during a tidal cycle.

Shockwave a strong pressure wave produced by explosions or other phenomena that create violent changes in pressure.

Side force neither a loss nor a gain.

Static hole a small hole drilled into a wall such that the plane of the hole is parallel to the flow direction.

Streamline A path in a steady flow field along which a given fluid particle travels.

Surface tension a force within the surface layer of a liquid that causes the layer to behave as an elastic sheet.

venturi a system for speeding the flow of the fluid, by constricting it in a cone-shaped tube.

Vorticity defined as the circulation per unit area at a point in the flow field.

Yaw The moment about the lift axis or lift direction