** WARNING 306076 ** Negative density encountered during analysis. Density = density, Temperature = temperature, Pressure = pressure.
A non-physical density value has occurred. This is usually a symptom of a problem earlier in the timestep. If a user PVT function is being used via the solver API, an inappropriate value was returned from a user specific volume function.
Check the input data (such as mesh, material data, processing conditions).
Check the Analysis Log for any previous warnings which might have led to this problem.
For the case of a user PVT function, check whether the indicated temperature and pressure values sent to your user function are sensible, and debug your function to see how the incorrect density value is being calculated.