Pressure drop 4.48 Pa at 39.1 l/s · PP v040.ipt: internal flow, inlet 5 m/s, Air (20 °C)
LaminaroCFD · Laminaro add-in v0.40.0 · 2026-10-27 17:46:58Z UTC
Design: PP v040.ipt as of 2026-10-27 17:01 UTC · a copy is kept with this run (design.ipt) · D = 100 mm
Pressure drop (total)4.479 Pa
Loss coefficient K = Δp ÷ ½ρv² (v: mean inlet velocity)0.2976
Flow rate39.09 l/s
Good enough for engineering use. The pressure drop is steady within under ±0.1 % (last 97 iterations); mass balance 0.00 %. The remaining unsettledness is mostly next to the walls.
Parameter study: D
| D [mm] | pressure drop [Pa] | flow [l/s] |
|---|
| 60 | 7.798 | 14.05 |
| 80 | 5.69 | 25 |
| 100 ✓ best | 4.479 | 39.09 |
Best = the lowest pressure drop.
Set-up
| Part | PP v040.ipt |
| Study | Diameter |
| Where the fluid is | Modelled fluid body (flow inside the part) |
| Fluid | Air (20 °C) (ρ 1.204 kg/m³, ν 1.516e-05 m²/s) |
| Inlet | 5 m/s |
| Time behaviour | steady (mean values) |
| Turbulence | k-ω SST (automatic: Re ≈ 3.3·10⁴: turbulent) |
| Mesh level | Standard |
Pictures
What this result rests on
- Good enough for engineering use. The pressure drop is steady within under ±0.1 % (last 97 iterations); mass balance 0.00 %. The remaining unsettledness is mostly next to the walls.
- One mesh only: mesh independence was not checked.
- Steady RANS (k-ω SST): mean values. Vortex shedding, peaks and fluctuating loads are not resolved.
- Stopped at iteration 194: converged (the solver's own limit: every residual below 10⁻⁵).
Notes
- Parameter study of D: 3 of 3 cases finished; best (the lowest pressure drop) at D = 100 mm: pressure drop 4.479 Pa (at the end of the range: values beyond it were not run).
- Mesh 493368 cells; values = mean of the last 10 % of 194 iterations.
- Δp = area-averaged pressure inlet → outlet; K = Δp_total / (½ρU²) with the inlet velocity; Re = 3.3e+04 (hydraulic diameter 0.1 m).
