Blow up criterion of strong solution for 3D viscous liquid-gas two-phase flow model with vacuum

In this paper, we establish a blow-up criterion to the local strong solution to the three dimensional (3D) viscous liquid-gas two-phase flow model only in terms of the divergence of the velocity field. Moreover, the initial vacuum is allowed, and there is no extra restriction on viscous coefficients. Both the Cauchy problem and initial-boundary value problem are considered in this paper.