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Abstract Template - XX Fluid Mechanics Conference KKMP2012

Abstract Template - XX Fluid Mechanics Conference KKMP2012

Abstract Template - XX Fluid Mechanics Conference

YZ1 1223.21 Hz I [dB] 88.4 87.2 86.1 84.9 83.8 82.6 81.4 80.3 79.1 78.0 76.8 75.7 74.5 73.3 72.2 71.0 69.9 68.7 67.5 66.4 65.2 XX Fluid Mechanics Conference KKMP2012, Gliwice, 17-20 September 2012 NUMERICAL AND EXPERIMENTAL VISUALIZATION OF ACOUSTIC FLOW OVER FLAT OBSTACLES Michał PYŁA, Stefan WEYNA, Witold MICKIEWICZ, Michał JABŁOŃSKI West Pomeranian University of Technology, Szczecin Poland E-mail: michal.pyla@zut.edu.pl Key words: flow acoustics, sound intensity, numerical modeling Energy distribution images in acoustic fields, connected with the graphical presentation of the flow waves are a new element in acoustic metrology. Introduction of these possibilities have greatly changed the approach to examining many acoustic phenomena. The new insight into the nature of acoustic field formation in real conditions of working sources may bring application of the sound intensity method in conjunction with the graphical presentation of space vector distribution of acoustic power. Acoustic conditions in these areas are much different from the theoretical assumptions ascribed to free or diffuse field. It is a frequent occurrence that the sound intensity measurements in real conditions may show great disparity between the theoretical assumptions of the acoustic fields distribution and the actual measurements. The disparity results mainly from simplifications accompanying the analytical and numerical methods due to lack of complete data concerning physical properties of an investigated object (de Rock at al. 2004). In the paper authors have described the visualization methods in acoustic flow fields around and between a flat barriers and show how these methods may assist scientists to gain understanding of complex acoustic energy flow (vortisity and turbulent effects) in real-life acoustic field. Own proposals of the graphical form will be presented to determine the real acoustic wave distribution in 2D and 3D flow field. Visualization of research results are shown in the form of a intensity streamlines and as a shape of floating acoustic wave or intensity isosurface, which is unavailable by conventional acoustics metrology. In traditional acoustic metrology, the analysis of acoustic fields concerns only the distribution of pressure levels (scalar variable), however in a real acoustic field both scalar (acoustic pressure) and vector (the acoustic particle velocity) effects are closely related. Only when the acoustic field is described by both potential and kinetic energies may we understand the mechanisms of propagation, diffraction and scattering of acoustic waves on obstacles, as a form of energy. This attribute of intensity method is very important in any industrial acoustic investigations. Based on the research with intensity technique and using selected visualizations methods (Pyła, Weyna 2010), examples of vector space distribution of the real acoustic field are demonstrated in the publication. 1223 Hz 1223 Hz YZ1 1223.21 Hz I [dB] 89.2 87.5 85.8 84.1 82.3 80.6 78.9 77.2 75.4 73.7 72.0 70.3 68.5 66.8 65.1 63.4 61.6 59.9 58.2 56.5 54.7 Fig. 1. Shapes of acoustic intensity vectors map describing the reaction of flow wave striking the single and double thin barriers

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Abstract Template - XX Fluid Mechanics Conference KKMP2012
Abstract Template - XX Fluid Mechanics Conference KKMP2012
Abstract Template - XX Fluid Mechanics Conference KKMP2012
Abstract Template - XX Fluid Mechanics Conference KKMP2012
Abstract Template - XX Fluid Mechanics Conference KKMP2012
Abstract Template - XX Fluid Mechanics Conference KKMP2012
Abstract Template - XX Fluid Mechanics Conference KKMP2012
Abstract Template - XX Fluid Mechanics Conference KKMP2012
Abstract Template - XX Fluid Mechanics Conference KKMP2012
Abstract Template - XX Fluid Mechanics Conference KKMP2012
Abstract Template - XX Fluid Mechanics Conference KKMP2012
Abstract Template - XX Fluid Mechanics Conference KKMP2012
Abstract Template - XX Fluid Mechanics Conference KKMP2012
Abstract Template - XX Fluid Mechanics Conference KKMP2012
Abstract Template - XX Fluid Mechanics Conference KKMP2012
Abstract Template - XX Fluid Mechanics Conference KKMP2012
Abstract Template - XX Fluid Mechanics Conference KKMP2012
Abstract Template - XX Fluid Mechanics Conference KKMP2012
Abstract Template - XX Fluid Mechanics Conference KKMP2012
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