flow.objectives.pressure_drop
flow.objectives.pressure_drop(rho, margin=1)Mean pressure across the inlet plane minus across the outlet plane.
This is the fan’s share of the bargain: what it costs to push air through whatever the design has left of the duct. The planes are taken margin cells inside the ends so the inlet’s imposed equilibrium and the outlet’s copied plane do not enter the number.
Parameters
| Name | Type | Description | Default |
|---|---|---|---|
| rho | jax.Array | Density, (NX, NY, NZ). |
required |
| margin | int | How many cells in from each end to measure. | 1 |
Returns
| Name | Type | Description |
|---|---|---|
| jax.Array | Scalar pressure drop in lattice units, positive for flow that | |
| jax.Array | resists. |