Fig. 9 | Scientific Reports

Fig. 9

From: Investigation of the physical driving mechanisms of wind noise in hearing devices by computational fluid dynamics

Fig. 9

Visulization of the three-dimensional flow structures around the head geometries with the help of the \(\lambda _{2}\)-criterion for an Isovalue of \(\lambda _{2}=-(50u_{\infty })^2/C_{head}^2\) at a representative timestep during simulation for a wind speed of 10 km/h (upper row) and 20 km/h (lower row). Where \(C_{head}\) is the circumference of the head. The flow structures are additionally coloured with the vorticity around main flow direction (x-axis) to indicate the rotational direction of the vortices.

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