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In the Israel-Stewart's theory of 2nd order dissipative hydrodynamics, wehave simulated $\phi$ production in Au+Au and Cu+Cu collisions at$\sqrt{s}_{NN}$=200 GeV. Evolution of QGP fluid with viscosity over the entropyratio $\eta/s$=0.25, thermalised at $\tau_i$=0.2 fm, with initial energydensity $\epsilon_i$=5.1 $GeV/fm^3$ explains the experimental data on $\phi$multiplicity, integrated $v_2$, mean $p_T$, $p_T$ spectra and elliptic flow incentral and mid-central Au+Au collisions. $\eta/s$=0.25 is also consistent withcentrality dependence of $\phi$ $p_T$ spectra in Cu+Cu collisions. The centralenergy density in Cu+Cu collisions is $\epsilon_i$=3.48 $GeV/fm^3$.

Viscous hydrodynamics description of $\phi$ meson production in Au+Au and Cu+Cu collisions