The pressure drop across the inlet and outlet connectors is computed according to a turbulent friction model, i.e. is proportional to the squared velocity of the fluid. The friction coefficient can be specified directly, or by giving an operating point, or as a multiple of the kinetic pressure. In the latter two cases, the correction coefficient Kfc can be used to modify the friction coefficient, e.g. to fit some experimental operating point.
A small linear pressure drop is added to avoid numerical singularities at low or zero flowrate. The wnom parameter must be always specified; the additional linear pressure drop is such that it is equal to the turbulent pressure drop when the flowrate is equal to wnf*wnom (the default value is 1% of the nominal flowrate).
Modelling options
The following options are available to specify the friction coefficient:
| Name | Description |
|---|---|
| Medium | Medium model |
| squareReg |