Helicopter deck analysis is performed to evaluate the air flow conditions above helicopter deck at e.g. offshore installations, vessels or buildings.

The layout of the helicopter deck and its surroundings impact the flow field and create turbulence above the helideck, and may cause problems for helicopter operations if turbulence exceeds certain limits (e.g. given by the standard CAP 437 issued by the Civil Aviation Authority).

We use the CFD tool FLUENT, where a 3D model of the helideck and surroundings is made for simulating the wind conditions at helicopter deck, applying a turbulence model which is applicable for the purpose. Turbulence levels are plotted and evaluated against the limits for helicopter operation.

Outlets of exhaust or other hot gases may cause temperature gradients above helicopter deck if the outlets are in the vicinity. Temperature gradients cause problems for helicopter operation if the gradient exceeds certain limits (e.g. given by the Norwegian standard NORSOK C-004). Further, unignited flaring may ignite if exposing the helicopter flight path (requirement to max gas concentration is given in e.g. NORSOK S-001).

Similar as for turbulence issues we use the CFD tool FLUENT for simulating the hot gas / flammable gas exposure of helicopter deck / path. Temperature gradients are plotted and evaluated against the limits for helicopter operation.

Example of turbulence plot for a  helicopter deck on an offshore installation:

Example of hot gas plume for a  helicopter deck on an offshore installation: