*GRDRAGNORM

Data format:

A single line with an arbitrary number of parameters, as follows:

IGR1_ IGR_2 ... IGR_I

Status :

Optional

Purpose :

The drag on all elements of the groups is based on |V|Vp instead of the usual formulation |Vp|Vp where V is the fluid velocity minus the structure velocity and Vp is the projection of that velocity either in the element axis (local Z axis) for use with axial drag coeffcients or in the plane perpendicular to that axis for normal drag coeffcicients..

Restrictions :

The groups must have been created previously.

Details :

Parameter	Description
IGR_1 ... IGR_I	List of groups of elements identified through their ID

Note : It is also possible to use as parameters 2 - 4, to select group 2, 3 and 4 instead of 2 3 4