Physics – Fluid Dynamics
Scientific paper
2010-05-22
Physics
Fluid Dynamics
15 pages, 8 figures. This paper has been withdrawn and will be re-posted after improvement
Scientific paper
A new algebraic method for computing helicity is developed, by discovering a relationship between helicity of fluid mechanics and algebraic polynomial invariants of knot theory. We have constructed a topological invariant $t^{H\left(\mathcal{L}\right)}$ for a link $\mathcal{L}$ of knots, where $H$ is the helicity of a given fluid and $t$ a formal constant. For oriented knotted vortex lines, $t^{H}$ satisfies the skein relations of the Kauffman R-polynomial; for un-oriented knotted lines, $t^{H}$ satisfies the skein relations of the Kauffman bracket polynomial. Our new algebraic method is to use skein relations to compute the helicity of a link $\mathcal{L}$ by algebraic recursion.
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