  We generate vortex tangles using a Hopf flow on a 3-sphere, in place of the
standard torus defined by periodic boundary conditions. These tangles are
highly anisotropic, with vortices tending to align along the flow direction.
Standard power law dependences change accordingly from their values in more
isotropic tangles. The line length density $\langle L\rangle$ is proportional
to $v_{ns}^{1.28}$, where $v_{ns}$ is the drive velocity, and the reconnection
rate depends roughly on $\langle L\rangle^2$. We also discuss the effect of the
full Biot-Savart law versus the local induction approximation (LIA). Under LIA
the tangle collapses so that all vortices are nearly aligned with a single flow
line, in sharp contrast to the torus where they become perpendicular to the
driving velocity. Finally we present a few torus simulations with a helical
velocity field, which in some ways resembles the 3-sphere flow.
