Wind on a silo.ipt: wind 22.74 m/s towards +X (on the ground, z0 0.05 m), Air (20 °C)
LaminaroCFD · Laminaro add-in v0.41.0 · 2026-10-27 23:04:01Z UTC
Design: Wind on a silo.ipt as of 2026-10-27 22:26 UTC · a copy is kept with this run (design.ipt)
Drag2 044 N
Cd0.365
Lift1 274 N
Side force2.247 N
Good enough for engineering use. The drag (Cd) is steady within ±0.1 % (last 200 iterations). The remaining unsettledness is at the part itself: its forces may still change a little.
Set-up
Part
Wind on a silo.ipt
Study
Example · Wind on a silo
Where the fluid is
Laminaro builds the fluid region around the part
Fluid
Air (20 °C) (ρ 1.204 kg/m³, ν 1.516e-05 m²/s)
Inlet
22.74 m/s · EN 1991-1-4 wind, v_b,0 25 m/s, terrain II
Time behaviour
steady (mean values)
Turbulence
k-ω SST (automatic: Re ≈ 4.9·10⁶: turbulent)
Mesh level
Standard
Convergence
Pictures
What this result rests on
Good enough for engineering use. The drag (Cd) is steady within ±0.1 % (last 200 iterations). The remaining unsettledness is at the part itself: its forces may still change a little.
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 302: converged (Cd steady within ±0.1 % over 200 iterations, residuals low).
Notes
Automatic air box (COST 732 sizing). Mesh 380918 cells; forces = mean of the last 10 % of 303 iterations.
Drag along the wind, lift along 'up' (+Z), reference area 17.994 m² (frontal), q = 311.3 Pa at the part's height (log-law wind profile).
Every number on this page comes from this run's own files (summary.json, the force-coefficient history, the solver log). The raw data is in the data folder. Print this page to PDF for a quick hand-out. Run folder (for your files and for support): C:\Users\niels\Dropbox\Brain Vault\Brain\Projects\Laminaro\jobs\Wind on a silo · Example · Wind on a silo · run 1 2026-10-27 2326\results
