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Shaping of magnetic flux surfaces is found to have a strong impact onturbulence and transport in tokamak edge plasmas. A series of axisymmetricequilibria with varying elongation and triangularity, and a divertorconfiguration are implemented into a computational gyrofluid turbulence model.The mechanisms of shaping effects on turbulence and flows are identified.Transport is mainly reduced by local magnetic shearing and an enhancement ofzonal shear flows induced by elongation and X-point shaping.Comment: 10 pages, 11 figures. Submitted to Physics of Plasma

Flux-surface shaping effects on tokamak edge turbulence and flows