  In this work we study the influence of isotropic and anisotropic fluids on
the spherically symmetric warp metric. We evaluate the energy conditions and
the influence of including a cosmological constant type term. We find that,
considering this term, there is a trade-off between the weak and strong energy
conditions. The obtained solutions are numerical and we solve the system for
both the stationary and the full regime. The influence of imposing the zero
expansion condition has been explored. We find a wide diversity of behaviours
for the solutions. In general there are regions of spacetime where the energy
conditions can be at least partially satisfied. Finally, we calculate the value
of the total mass using the density found in the numerical simulations, finding
examples where it remains positive during the entire evolution of the system.
