Regional Parameter Values in 3D

In three-dimensional problems, a redefinition of a parameter inside a REGION causes the parameter to be redefined in all layers of the layer stack above the region.  To cause the parameter to be redefined only in a selected layer, use the LAYER qualifier, as in

LAYER number         name = new_expression

LAYER "layer_name"  name = new_expression

The LAYER qualifier acts on all subsequent parameter redefinitions, until a new LAYER qualifier or a functionally distinct clause breaks the group of redefinitions.

Example:

The following descriptor fragment shows the redefinition of a parameter K in various contexts:

DEFINITIONS

K=1                { 1 }

BOUNDARIES

LAYER 1 K=2        { 2 }

REGION 1

   K=3                { 3 }

   LAYER 2 K=4        { 4 }

   START(0,0) LINE TO ....

Line { 1 } defines the default value.

Line { 2 } (valid only in 3D) defines the value in layer 1 of all regions.

Line { 3 } redefines the value in region 1 only, in all layers of a 3D domain.

Line { 4 } (valid only in 3D) defines the value in layer 2 of region 1 only.