Aerodynamics

Photo: cowi
An understanding of the interactions between the natural wind and a given structure is often important to ensure a proper function regarding structural integrity and human comfort.

Aeroelastic analysis

Slender structures such as long-span bridges, chimneys, towers and cables are vulnerable to dynamic wind actions. COWI has been actively involved in the design and prediction of wind actions and elastic responses of such structures since the Little Belt project in the mid-1960s.  

Our services include the prediction of dynamic wind actions and fatigue life and mitigation of undesirable wind effects.

Computer simulation of wind effects

Wind loading and stability of structural elements are important elements when assessing structural adequacy. Wind load coefficients and stability have traditionally been assessed by means of wind tunnel tests, but today computer simulations is a quick and cost-efficient alternative.

Our services include determination of wind load coefficients, flutter derivatives and vortex-shedding response of structural elements.

Mitigation of wind-induced response

The wind-induced response of slender structures may often be mitigated by the introduction of damping devices or by reshaping the external geometry.

Our services include the design of internal mechanical dampers and external spoiler and guide vane devices for suppression of wind-induced vibrations. 

Design of wind tunnel experiments and field tests

COWI possesses extensive experience in the design of and follow-up on wind tunnel tests and full-scale measurements in the field. Our experience ranges from wind tunnel testing of bridge sections, cables and full aeroelastic models, full-scale mock-ups of building elements to field testing of wind screens and blast fences.  

COWI cooperates with a number of internationally well-established wind tunnel laboratories.  

Wind engineering and micro-meteorology

The wind climate at the site of a structure is an important parameter in the structural design and performance assessment.  

Our services comprise the design of on-site wind measuring systems, statistical analysis of wind data and drafting of wind design specifications.

Human comfort in windy environments

The wind climate at a particular site is often changed by new buildings and structures. The success of a new building is thus often dependent on the human perception of the local wind climate around the building. This quality should to be assessed in the development stage.

Our services comprise the analysis of human wind comfort in built-up areas (pedestrian wind comfort) by means of desk top studies, computational fluid dynamics and wind tunnel testing.

Wind-induced spread of smoke and toxic gasses

The wind-induced spread of smoke and heavy gasses is important when assessing tunnels and new town developments.

Our services comprise computational fluid dynamics simulations for the spread of smoke, fire and toxic gasses in closed and open spaces.

LAST UPDATED: 01.04.2017