0 said, especially in the past, by someone who wanted people to come and pay to look at something unusual or interesting:
1 to arrive at a particular place or event, usually late:
2 a cigarette that you make by wrapping a piece of paper around some tobacco
3 used to describe a loan on which you do not pay interest while you are paying back the principle (= amount borrowed), but pay it at the end of the period of the loan:
a roll-up mortgage
The principal feature in the roll-up of the ligament is that the only stable configuration is that of a sphere.
These data suggest that the growth of the instability and the resulting vortex roll-up is considerably stronger in the circular jet.
The calculation proceeds smoothly until roll-up begins; inevitably the sheet crosses itself.
To obtain a regular roll-up the vortices are uniformly spaced and given a sinusoidal perturbation of the appropriate wavelength.
The result is the roll-up of the shear layer into vortical lumps one wavelength apart, connected by thin braids.
In actual physical flows, a nonlinear roll-up of the vortex sheets occurs and the wake configuration is not known in advance.
Both the roll-up and the coalescence of the vortices take place in a region, not at a single point.
These data show that both the vortices accelerate after roll-up, then vortex 1 continues to accelerate but vortex 2 starts decelerating.
