DESCRIPTIONThis modules computes a streamline in a vector field defined on the base lattice of a pyramid. It requires a pick input to seed the streamline. Streamlines can be advected forwards and/or backwards in time. Any type of pyramid is allowed. Simple linear interpolation together with a second-order adaptive Runge-Kutta method is used for numerical integration.
Port: Pyramid In
Constraints: 1..3-D compression
Constraints: n-compression type
The pyramid whose base lattice contains the vector data.
Port: Start Point
The start point of the streamline.
Optional: This port is optional.
The integration timestep can be set by wiring a parameter into this port. Otherwise, the timestep is computed internally, which may or may not be appropiate.
Type: Option Menu
Menu Item: Forwards
Menu Item: Backwards
Menu Item: Both
The direction (in time) to advect the particle.
Remove all existing streamlines from the display.
KNOWN PROBLEMSThe streamline will terminate when it reaches a stagnation point, or exceeds a certain number of points. No checking for closed streamlines is done. The interpolation scheme is valid within a radius of the grid points. This means that streamlines may go beyond the bounds of the domain.
SEE ALSONAGAdvectSimple, NAGAdvectAnimate.
© The Numerical Algorithms Group Ltd, Oxford UK. 2000