This data item defines a polynomial in space in 1D or 2D. The polynomial specifies the cross-sectional area (in 1D) or the thickness (2D) as function of the global coordinate (1D) or the global , coordinates (2D). By example, in a 1D solid calculation it can be used to specify varying cross-sectional areas of bars, or in a 1D flow calculation it can be used to specify the cross- sectional area of a channel.
In 1D the polynomial is . In 2D the polynomial is .
If this record is not specified, the cross-sectional area is 1 (1D) or the thickness is 1 (2D).
See also volume_element_factor.