  The observation of an astrophysical neutrino flux in IceCube and its
detection capability to separate between the different neutrino flavors has led
IceCube to constraint the flavor content of this flux. IceCube-Gen2 is the
planned extension of the current IceCube detector, which will be about 8 times
larger than the current instrumented volume. In this work, we study the
sensitivity of IceCube-Gen2 to the astrophysical neutrino flavor composition
and investigate its tau neutrino identification capabilities. We apply the
IceCube analysis on a simulated IceCube-Gen2 dataset that mimics the High
Energy Starting Event (HESE) classification. Reconstructions are performed
using sensors that have 3 times higher quantum efficiency and isotropic angular
acceptance compared to the current IceCube optical modules. We present the
projected sensitivity for 10 years of data on constraining the flavor ratio of
the astrophysical neutrino flux at Earth by IceCube-Gen2.
