Block Format Keyword ALE boundary nodes can be tied to Lagrangian surface to make fluid structure interaction. This way Lagrangian surface is acting as a sliding wall boundary condition.


(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
surf_IDA surf_IDL                


Field Contents SI Unit Example
inter_ID Interface identifier.

(Integer, maximum 10 digits)

inter_title Interface title.

(Character, maximum 100 characters)

surf_IDA ALE surface identifier.


surf_IDL Lagrangian surface identifier.




  1. This interface is not compatible when the Lagrangian surface is in a rigid body.
  2. The Lagrangian surface normals do not need to be oriented in a specific direction.
  3. A small gap (positive or negative) can exist between the ALE surface nodes and the Lagrangian the surface.
  4. The Lagrangian surface cannot be immersed inside the fluid domain. It should always be located outside of the ALE mesh.