ellipse

NAME

ellipse

SYNOPSIS

          ellipse x0 y0 rx ry theta [-optional link arguments]

DESCRIPTION

ellipse creates a elliptical entity of immersed boundary points. ellipse requires five arguments.

• x0 - x coordinate of the ellipse center
• y0 - y coordinate of the ellipse center
• rx - the major axis of the ellipse
• ry - the minor axis of the ellipse
• theta - rotation in degrees of the axis'

ellipse allows for optional link arguments by interpreting the following options.

• -A name - indicates this entity is active and provides a name
• -a angle - resting angle at the IB points
• -b bend - bending stiffness at the IB points (default=40000)
• -d distance - initial distance between IB points (default=0.5)
• -N name - provides a name for the entity
• -n number - number of IB points around the ellipse
• -s stiff - inter-IB-point spring stiffness (default=40000)
• -t tether - tether spring stiffness (default=0)

The default resting length is determined so the points are no more than a distance of h/2 apart. The default resting angle is determined so that the ellipse remains a ellipse if there is no fluid flow. The tether points are located at the initial IB point positions.

SEE ALSO

circle

EXAMPLE

          ellipse 1.0 1.25 0.5 0.25 45

Forms a ellipse centered at (1,1.25) with a major axis equal to 0.5 and a minor axis equal to 0.25, and rotated to 45 degrees.