PHASTA is a parallel, hierarchic (2nd to 5th order accurate), adaptive, stabilized (finite-element) transient analysis tool for the solution of compressible or incompressible flows. PHASTA (and its predecessor ENSA) was the first massively parallel unstructured grid LES/DNS code and has been applied to flows ranging from validation benchmarks to cases of practical interest. The practical cases of interest not only involve complicated geometries (such as detailed aerospace configurations or human arterial system) but also complex physics (such as fluid turbulence or multi-phase interactions).