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ATLAS measurements of the azimuthal anisotropy in lead-lead collisions at$\sqrt{s_{NN}}=2.76$ TeV are shown using a dataset of approximately 7$\mu$b$^{-1}$ collected at the LHC in 2010. The measurements are performed forcharged particles with transverse momenta $0.5<p_T<20$ GeV and in thepseudorapidity range $|\eta|<2.5$. The anisotropy is characterized by theFourier coefficients, $v_n$, of the charged-particle azimuthal angledistribution for n = 2-4. The Fourier coefficients are evaluated usingmulti-particle cumulants calculated with the generating function method.Results on the transverse momentum, pseudorapidity and centrality dependence ofthe $v_n$ coefficients are presented. The elliptic flow, $v_2$, is obtainedfrom the two-, four-, six- and eight-particle cumulants while higher-ordercoefficients, $v_3$ and $v_4$, are determined with two- and four-particlecumulants. Flow harmonics $v_n$ measured with four-particle cumulants aresignificantly reduced compared to the measurement involving two-particlecumulants. A comparison to $v_n$ measurements obtained using different analysismethods and previously reported by the LHC experiments is also shown. Resultsof measurements of flow fluctuations evaluated with multi-particle cumulantsare shown as a function of transverse momentum and the collision centrality.Models of the initial spatial geometry and its fluctuations fail to describethe flow fluctuations measurements.

Measurement of flow harmonics with multi-particle cumulants in Pb+Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV with the ATLAS detector