In a turbulent motion, the true velocity and pressure vary in a disorderly manner. A

turbulent motion is always unsteady, since at a given point the velocity changes

continuously in a very irregular way.

A numerical instability which presents itself as a high value followed by a low value

followed by a high value at the corners of the elements. When contoured, a two

delta-X oscillation looks like a case of mesh measles.

A triangle (3 corners and 3 mid-side nodes) or quadrilateral (4 corners and 4 mid-

side nodes) shape which defines the geometry in two space coordinates and averages

over the third space coordinate. In a two dimensional *Horizontal *model, the

averaging occurs over depth. In a two dimensional *Vertical *model, the averaging

occurs over width. Several two dimensional horizontal elements aligned side by side

may accurately define the bottom elevation of a navigation channel.

The process by which we gain confidence in the ability of our model to predict

behavior of the prototype. Field data, like the model results, are only an

approximation of reality and must be treated with skepticism. In verifying SED2D,

the primary adjustments to be made are ???? to the geometry, boundary conditions,

roughness, and eddy viscosity. These adjustments are made interactively until the

model agrees satisfactorily with field (prototype) observations.

An elemental projection in the *z *direction. The water profile from the surface to the

bottom of the water body.

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