DEFINITION OF THE I J K DIRECTIONS

 The interface allows the PHOENICS I J K directions to differ from the global X Y Z. The user can define the grid origin and the I, J and K directions or allow the interface to provide default values. The directions are only defined on the first block in the model. The IJK values on all other blocks are deduced from the first value.

The I,J and K directions are defined in terms of named nodes. Any of the I, J or K directions can be defined but if any direction is to be defined the origin node must be given. The nodes are 'named' using the command:

    GEOMETRY POINT AT-NODE node_name node_number

where node_name is IORG, INOD, JNOD or KNOD and node_number is the number of the node required.