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Intro on CFD

March 11, 2011

Computational Fluid Dynamics:

CFD is a branch of Fluid Mechanics, that uses numerical method and algorithm to solve and analyse problem involve in the fluid flow. Computers are mainly used to simulate interactions of liquid and gases with surfaces defined by boundary condition.

Methodology:

Procedure:

In all the above approaches the same basic procedure is followed.

There are 3 stages:

1. Preprocessing  2. Simulation   and 3. Post Processing

  • 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 modeling is defined – for example, the equations of motions + enthalpy + radiation + species conservation
    • Boundary conditions are defined. This involves specifying the fluid behaviour 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 a steady-state or transient.
  • Finally a postprocessor is used for the analysis and visualization of the resulting solution.

 

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