New enclosed geometry · Completed solver records

The passage carries flow.
Now reduce its losses.

Both revised bodies have completed 2,400 steady iterations. The last 400 iterations give about 0.773 N paired drag for the open route and 0.724 N for its blocked control: a 6.8% penalty in this low-speed engineering calculation.

The enclosed route is therefore not a demonstrated passive drag reduction. It provides an internal flow path whose cooling, powered-thrust and braking benefits must be evaluated against its installed losses.

The next design inputs are a smoother intake neck, larger effective bend radii and metered flow. The controller should open or restrict the route according to the work it supplies in each driving mode.

Use the solved field.

The streamline plot integrates the calculated velocity field. Eleven of 14 recorded traces from 15 starting seeds remain inside the duct and traverse the passage. Exterior bypass traces are excluded from that through-passage count.

This is a frozen steady RANS field on the 60 mm rear-reroute body. It is not a physical-time particle experiment, the motion-aware body or a high-speed performance result.

Solved mean-velocity streamlines that remain inside the rerouted internal passages, with the engineering body shown transparently
Actual solved steady-field streamlines, mirrored from the half-domain. Colour indicates calculated mean speed. The transparent envelope is the engineering proxy.
Complete open and blocked drag histories across 2400 steady solver iterations
Iterations are not seconds. Force-window drift, stronger refinement, wall treatment and physical-time sampling remain separate qualification tasks.
Complete matched force records ↗Streamline coordinates and field values ↗