Turnover generates outward flows from defect cores that overcome elastic attraction, stabilizing topological defects in compressible active polar fluids and producing lattices, foams, and vortex glasses.
Role of friction in multidefect ordering
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abstract
We use continuum simulations to study the impact of friction on the ordering of defects in an active nematic. Even in a frictionless system, +1/2 defects tend to align side-by-side and orient antiparallel reflecting their propensity to form, and circulate with, flow vortices. Increasing friction enhances the effectiveness of the defect-defect interactions, and defects form dynamically evolving, large scale, positionally and orientationally-ordered structures which can be explained as a competition between hexagonal packing, preferred by the -1/2 defects, and rectangular packing preferred by the +1/2 defects.
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Defect states in compressible active polar fluids with turnover
Turnover generates outward flows from defect cores that overcome elastic attraction, stabilizing topological defects in compressible active polar fluids and producing lattices, foams, and vortex glasses.