The process cycle is as followed:

  • During preprocessing
    • The geometry (physical bounds) of the problem is defined
    • The volume occupied by the fluid is divided into discrete cells (the mesh). The mesh may be uniform or non uniform.
    • The physical modelling is defined - for example, the equations of motions + enthalpy + radiation + species conservation
    • Boundary conditions are defined. This involves specifiying the fluid behavior and properties at the boundaries of the problem. For transient problems, the initial conditions are also defined.
  • The simulation is started and the equations are solved iteratively as steady-state or transient.
  • Finaly a postprocessor is used for the analysis and visualization of the resulting solution.

The preconditions for a simulation

  • physical description: Ther must be a model described by physics.
  • reasonable computing time: the computing time depends on complexity of the mesh and the numerical solution mehtod.