** ERROR 223013 ** Solution unstable.
At each timestep, the flow solution iteratively solves the pressure, velocity and viscosity values until a consistent set of values is obtained. This iterative cycle has diverged catastrophically and the simulation cannot continue. This problem can occur for a variety of reasons. Sometimes it is due to highly non-linear material data, or to a sudden jump in the applied injection pressure or flow rate.
Check that the mesh quality is good. Remesh the original CAD geometry starting with a higher quality (lower aspect ratio) Dual Domain mesh. Check the viscosity and pvT model data. If you have entered a ram speed and/or packing profile, eliminate any instantaneous pressure or flow rate jumps by adding additional data points so that the pressure or flow range changes occur over a short transition period.