Generalized hydrodynamics of the repulsive spin- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mfrac><mml:mn>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:math> Fermi gas

We study nonhomogeneous quantum quenches in a one-dimensional gas of repulsive spin-$1/2$ fermions, as described by the integrable Yang-Gaudin model. By means generalized hydrodynamics (GHD), we analyze detail real-time evolution following sudden change confining potential. consider particular release protocols and trap quenches, including version Newton's cradle. At zero temperature, employ simplified phase-space hydrodynamic picture to characterize dynamics particle- spin-density profiles. Away from temperatures, perform thorough numerical GHD equations, provide quantitative predictions for different values external magnetic field, chemical highlight qualitative features arising due multicomponent nature elementary excitations, discussing effects spin-charge separation dynamical polarization.