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The statistics of the energy and helicity fluxes in isotropic turbulence arestudied using high resolution direct numerical simulation. The scalingexponents of the energy flux agree with those of the transverse velocitystructure functions through refined similarity hypothesis, consistent withKraichnan's prediction \cite{Kr74}. The helicity flux is even more intermittentthan the energy flux and its scaling exponents are closer to those of thepassive scalar. Using Waleffe's helical decomposition, we demonstrate that theexistence of positive mean helicity flux inhibits the energy transfer in thenegative helical modes, a non-passive effect

Intermittency in the Joint Cascade of Energy and Helicity