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Aeroacoustic whistling

Aeroacoustic whistling corresponds to a HF sound, emergent, very directive and steady. It is easily related to its source due to its directivity and emergence; one says it is signed. Its frequency signature as well as its pitch vary depending to speed. It is less fluctuant and as emergent as a “leak”. It is a very unpleasant if not unacceptable sound. Aeroacoustic whistling is caused by an airflow exciting an airstrip between two pieces such as roof racks or an asperity in a ventilation duct, creating a sound similar to a flute or a whistling kettle.