  Chiral symmetry is known to be decisive for an understanding of the low
energy sector of strong interactions. It is thus important for a model of
relativistic heavy ion collisions to incorporate the dynamical breaking and
restoration of chiral symmetry. Thus we study an expansion scenario for a
quark-meson plasma using the Nambu--Jona-Lasinio (NJL) model in its three
flavor version. The equations of motion for light and strange quarks as well as
for pions, kaons and etas are solved using a QMD type algorithm, which is based
on a parametrization of the Wigner function. The scattering processes
incorporated into this calculation are of the types qq <--> qq, q\bar q <-->
q\bar q, q\bar q <--> MM and M <--> q\bar q.
