Download movie as MP4 or WebM.

Step 1: Identify the mode number and its description.

• The mode number is 55.
• Mode 55 is a vibration about the horse's head, primarily involving movement of the neck.

Step 2: Note that all modes are scaled to the same maximum displacement for easier comparison.

• This means the magnitude of each mode does not represent its actual amplitude.

Step 3: Recognize that the colors used in the visualization indicate the direction and relative amount of displacement at different points on the horse's body.

• Red indicates large displacements or rotations.
• Blue, green, yellow, and white indicate smaller displacements or rotations.

Step 4: Identify the primary motion pattern of Mode 55 by observing where the largest displacements occur:

• The largest displacements are observed around the head and neck region.

Conclusion:

The LS-DYNA simulation "horsem-g1/movie_055.mp4" visualizes the vibration mode about the horse's head, primarily involving movement of the neck.