Computational Fluid Dynamics
Guozhao Ji,The universal principles of fluid motion are the conservation of mass, momentum
and energy. This chapter will introduce the CFD governing equations and describe
how the continuity equation, component equation, Navier-Stokes equation and
energy equation were derived from the principles above. With the expanding application
of CFD simulation technology, some processes such as fluid-involved reactions,
adsorption and permeation, which break the conservation of mass, momentum and
energy for fluid phase, should be coupled to CFD model. In view of this, this chapter
provided the theories about source terms for the mass equation, momentum equation
and thermal energy equation. The technology for solving these governing equations
remained a challenge for a long period due to the complexity. Thanks to the development
of numerical methods, such as the finite difference method and the finite
volume method, these equations can be solved and provide reasonable numerical
results of flows, heat transfer and reactions. This chapter also demonstrates the basics
of these two major numerical techniques.
Keywords: governing equations, finite-difference method, finite-volume method,
reacting flow, multiphase flow, source term