Initial Velocities

Initial velocities are entered as FEMGEN loads thus:

PROPERTY LOADS I-VEL [load_name] [loadcase] 'part' V_x1 V_y1 V_z1

or as FEMGEN initial conditions thus:

PROPERTY INITIAL IVEL [load_name] 'part' V_x1 V_y1 V_z1

The load name and loadcase number are optional and 'part' can be any FEMGEN geometric part or set. The initial velocity is defined as a vector and extrapolated to the nodes on the part by the interface.

Any number of initial velocity conditions may be applied to the model and the interface will sum such definitions and output velocities for all nodes in the model.

Where differing initial velocities are applied to parts which have geometric entities in common, the initial velocity on the common parts will be overwritten by the latest defined I-VEL load.

Care should be taken to ensure that initial velocities are consistent with any prescribed velocities at time zero.

There are five optional parameters associated with this command:

P1 P2 V_x2 V_y2 V_z2

These may be used to specify a linear variation in velocity from V₁ at point P1 to V₂ at point P2 Where P1 and P2 are FEMGEN point names.