The formation of noises, e.g. in the case of components, machines or tools, can often be traced back to flow processes. The noises are caused by pressure, density and speed changes. With the aid of the aeroacoustics (also called flow acoustics), the formation and propagation of these flow-induced noises can be simulated.
Application Example: Organ Pipe
The following example shows the sound formation and propagation of an organ whistle.
The sound transmitted through the air is perceived as noise by the human ear in a specific frequency and sound pressure level range.
In the case of an organ whistle, the sound is produced by the vibration of an air column inside the pipe. This type of tone generation is also applies to the flute.
Velocity distribution in the flow field (left) and at the pipe foot (right)
Comparison of simulation and experiment of aeroacoustics
Far field prediction in free field propagation
Pressure fluctuations in the flow field
» Localization of sound sources
» Examination of sound propagation
» Minimizing the causes of noise (noise reduction)
– Interior acoustics (e.g., in the vehicle)
– Circulation noise from vehicles
– Valve noise
– Fan noise
– Machine-generated noise (e.g., rotating components)
Your contact person:
Dr. sc. techn. Christian Mielke
Head of Fluid Mechanics Division
Tel.: +49 7321 9343-16