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Wind Tunnel

All articles tagged with #wind tunnel

Aero gravel showdown: Crux 5 edges rivals in wind tunnel test as Argon 18 leads bike-only
bikes2 days ago

Aero gravel showdown: Crux 5 edges rivals in wind tunnel test as Argon 18 leads bike-only

Wind-tunnel testing of aero gravel bikes at 35 km/h compares current models. Argon 18 Anti Matter posts the best bike-only drag numbers, Specialized Crux 5 leads the rider-on results by a razor-thin margin, and Wilier Rave sits close; Pinarello Dogma GR and Reap Type 300 are within the margin of top spot. The study also shows tyre clearance and wheel choice matter: wider tyres (up to 57–61mm) reduce rolling resistance and drag, and a wheel upgrade can swing watts by several points (Lauf Seigla benefiting most). Overall, aero and clearance plus rider position drive gravel-bike performance far more than any single factor.

via Cyclingnews|
#aero#argon-18-anti-matter#bikes
Specialized Crux 5 pivots to aero gravel with lighter builds and new geometry
technology2 days ago

Specialized Crux 5 pivots to aero gravel with lighter builds and new geometry

Specialized today unveiled the Crux 5, a gravel-focused redesign that shifts away from cyclocross with a longer, slacker geometry, 55mm tyre clearance, and 52t chainring clearance. Builds start around 6.9–7.1 kg with lighter Terra wheels and a one-piece cockpit, and the bike touts about a 15.2-watt aero improvement over the previous Crux. It remains 1x-compatible (with mechanical groupsets), internally routed, and introduces an S-Level lineup alongside S-Works, aiming to be a true gravel racer rather than a cross bike. The company backs its aero claims with wind-tunnel data and its “Equation of Speed,” factoring weight, rolling resistance, and aerodynamics into on-trail performance. Prices range from roughly $4,500 to $14,000, with framesets available in select markets.

via Cyclingnews|
#aero-efficiency#geometry#gravel-bikes
SAFS: NASA’s Polarized Light Camera Makes Airflow Visible Like Never Before
technology3 months ago

SAFS: NASA’s Polarized Light Camera Makes Airflow Visible Like Never Before

NASA Langley’s Self-Aligned Focusing Schlieren (SAFS) imaging uses light polarization to visualize airflows in wind tunnels, simplifying beyond traditional dual-grid schlieren setups. Since its 2020 debut, SAFS offers faster, cheaper, on-site flow visualization, captures complex shock structures around boosters, and is now used by 50+ institutions in 8+ countries, earning the 2025 R&D 100 Award and NASA’s Government Invention of the Year.

via NASA (.gov)|
#aerospace#nasa#safs
Study Challenges Long-Held Principles on Turbulent Flows in New Findings
science2 years ago

Study Challenges Long-Held Principles on Turbulent Flows in New Findings

Experiments conducted at the Max Planck Institute for Dynamics and Self-Organization (MPI-DS) in Göttingen reveal that the scaling laws formulated over 80 years ago, which explain turbulent flows, are only partially accurate. The study shows that these laws, established by mathematician Andrei Kolmogorov in 1941, apply only to strongly idealized flows and do not fully explain real-world turbulence. The researchers used a unique wind tunnel to generate high degrees of turbulence and found systematic deviations from Kolmogorov's predictions, suggesting that medium-sized eddies are not completely decoupled from larger eddies in a system. The findings have implications for understanding turbulence in engineered flows and climate models.

via Phys.org|
#empirical-data#research-facility#scaling-laws