ABSTRACT
The basic CFD variables are pressure and velocity, as in acoustics. But CFD is broader. First, while viscosity is generally ignored in acoustics, it is always present in real fluids and CFD generally needs to take it into account. Its effects can range from barely significant to completely dominating, depending on the nature of the fluid and on the flow regime. In what follows, the effects of viscosity will first be applied to the TLM solution of the acoustic wave equation. By iterating the solution, with appropriate boundary conditions, until a steady state is reached, this technique can be used to determine velocity flow fields for steady flow viscous problems.
