1. Classify the job according to the physical phenomena involved:
- Laminar or turbulent flow.
- Compressible or incompressible.
- Steady or transient.
- Isothermal or not.
- Emdedded resistance or porous media regions
- Single or multi-component.
- Single or multi-phase.
- Chemical reaction.
- Combustion and radiation. - etc.
2. Establish whether physical sub-models exist which adequately describe the expected flow phenomena.
3. Check that appropriate (and where possible validated) physical sub-models are selected during model set-up.
4. Undertake sensitivity tests, where necessary, to address uncertainty arising from physical sub-models.
- Uncertainty in which model is most appropriate, i.e. Boussinesq or fully buoyant flow.
- Uncertainty in the values of model parameters, such as inter-phase transfer terms.
- Uncertainty in the mathematical model description of physical phenomena may require model development.