Abstract
In engineering applications the noisiness of a component or the whole device is a common problem. Currently, a lot of effort is put to eliminate noise of the already produced devices, to prevent generation of acoustic waves during the design of new components, or to specify the operating problems based on noisiness change. The experimental method and the mathematical modelling method belong to these identification methods. With the power of today’s computers the ability to identify the sources of the noise on the mathematical modelling level is a very appreciated tool for engineers. For example, the noise itself may be generated by the vibration of the solid object, combustion, shock, fluid flow around an object or cavitation at the fluid flow in an object. For the given task generating the noise using fluid flow on the selected geometry and propagation of the acoustic waves and their subsequent identification are solved and evaluated. In this paper the principle of measurement of variables describing the fluid flow field and acoustic field are described. For the solution of fluid flow a mathematical model implemented into the CFD code is used. The mathematical modelling evaluation of the flow field is compared to the experimental data.
Highlights
The numerical solutions of the generation and propagation of the acoustic waves help reduce the noise level of the individual components or the equipment altogether
With the power of today's computers the ability to identify the sources of the noise on the mathematical modelling level is a very appreciated tool for engineers
The mathematical modelling evaluation of the flow field is compared to the experimental data
Summary
The numerical solutions of the generation and propagation of the acoustic waves help reduce the noise level of the individual components or the equipment altogether. Today the possibility of numerical modelling of the generation and propagation of acoustic waves is a very appreciated tool. These numerical simulations are compared with the data obtained by experimental measurements, which is, for measurements of noise or sound intensity, highly expensive procedure as regards the experimental equipment and staff. For the numerical modelling of the fluid flow using CFD (Computational Fluid Dynamics) code and the subsequent modelling of propagation of acoustic waves the most interesting applications are in the field of cavitation behaviour of the fluid elements and in the field of the flown-around obstacles, known as aeroacoustic noise (CAA - Computational aeroacoustics)
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