Engineering Assumptions

AFT xStream is based on the following fundamental fluid mechanics assumptions:

  • Compressible flow

  • One-dimensional flow

  • System is fluid-full

  • All gases are superheated (single phase)

  • No chemical reactions

  • No supersonic flow in the system

  • Pipes are rigid (pipe geometry does not change during the transient)

  • The Method of Characteristics (MOC) solution used has several significant assumptions that impact accuracy - see the Method of Characteristics topic for more info

  • Additional assumptions exist for particular modeling components and features, discussed where relevant

Related Examples

Fluid Library Comparison - Steam Turbine Shutdown Example