# Simulations of the Dynamics of Vocal Folds Using the Immersed Boundary Method

Dr. G. C. Duncan and G. Zhai

Department of Physics and Astronomy

Bowling Green State University

Bowling Green, OH 43402 USA

## Movies of 2D Model Vocal Folds

The animated gifs below each represent 21 snapshots of the positions of the boundary points which represent
the instantaneous positions of the 2D vocal fold model. The direction of the air flow is from the
right to the left of each frame, with the pressure gradient applied with higher pressure at the right end
of each frames to the lower pressure at the left of each frame.

The movie above shows the motion of the 2d model vocal folds alone.

This is a movie of the motion of four sets of massless markers advected by the velocity field. Note that
the times between sampling are long, so one should not interpret this too literally. More samples are
needed to get a more adequate picture of the effect of the computed velocity field.

This movie shows the dynamics of the contours of the vx component of the aerodynamic velocity field.

This movie shows the dynamics of the contours of the vy component of the aerodynamic velocity field.

This movie shows the dynamics of the contours of the pressure. Note that the resolution is only 64 points
across the region perpendicular to the inflow. Across the narrowest point there are only a few zones, so
the accuracy of the computation of the pressure suffers.