ALE Kinematic Conditions

Boundary Conditions

Boundaries with Lagrangian materials are declared automatically Lagrangian.

Nodes can be declared Lagrangian.

Constraints can be applied separately or simultaneously on:

These constraints can be applied in one or several directions of a skew reference frame.

When the flag is set to 1, boundary condition is activated with global reference frame or skew reference frame.

i = DOF with respect to global reference frame or skew reference frame

VELOCITY: Vi = 0

ACCELERATION: π i = 0

The boundary conditions can be changed during Engine runs with /BCS or /BCSR Engine options.

An ALE link is identical to a rigid link. The secondary node sets' grid velocity can be controlled by two main nodes, M1 and M2.

There are three options to choose from:

Option 0: Velocity is linearly interpolated with respect to order of input.(1)
$W_{N I} = W {}_{M 1} + (W_{M 2} - W_{M}_{12}) \frac{I}{N + 1}$
Option 1: Velocity is set to maximum absolute velocity of main nodes.(2)
$W_{N I} = W_{M 1} if | W_{M 1} | < | W_{M 2} |$
Option 2: Velocity is set to minimum absolute velocity of main nodes.(3)
$W_{N I} = W_{M 1} if | W_{M 1} | < | W_{M 2} |$; The input data is specified at each restart run.