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We revisit the vertical structure of neutrino dominated accretion flows(NDAFs) in spherical coordinates with a new boundary condition based on themechanical equilibrium. The solutions show that NDAF is significantly thick.The Bernoulli parameter and neutrino trapping are determined by the massaccretion rate and the viscosity parameter. According to the distribution ofthe Bernoulli parameter, the possible outflow may appear in the outer region ofthe disk. The neutrino trapping can essentially affect the neutrino radiationluminosity. The vertical structure of NDAF is like a "sandwich", and themultilayer accretion may account for the flares in gamma-ray bursts.

Revisiting vertical structure of neutrino-dominated accretion disks: Bernoulli parameter, neutrino trapping and other distributions