Translation (geometry) Translation (geometry) In Euclidean geometry, a translation is a geometric transformation that moves every point of a figure or a space by the same distance in a given direction. In Euclidean geometry a transformation is a one-to-one correspondence between two sets of points or a mapping from one plane to another. A translation can be described as a rigid motion: the other rigid motions are rotations, reflections and glide reflections. A translation can also be interpreted as the addition of a constant vector to every point, or as shifting the origin of the coordinate system. A translation operator is an
Thermal boundary layer thickness and shape a useful definition of this characteristic, measurable thickness for the thermal boundary layer. Also included in this boundary layer description are some parameters useful in describing the shape of the thermal boundary layer. The thermal boundary layer thickness, formula_8, is the distance across a boundary layer from the wall to a point where the flow temperature has essentially reached the 'free stream' temperature, formula_11. This distance is defined normal to the wall in the formula_12-direction. The thermal boundary layer thickness is customarily defined as the point in the boundary layer, formula_13, where the temperature formula_14 reaches 99% of the free