Influence of the Mesh Size on the Aerodynamic and Aeroacoustics of a Centrifugal Fan using the Lattice-Boltzmann Method
* Presenting author
Due to market requirements and ever stricter guidelines, noise emissions of fans are becoming increasingly important in addition to energy efficiency. For this reason, developer aims not only at more efficient running fans but also ever quieter fans. In order to keep the development process cost-effective and short, numerical investigations are used today. The Lattice-Boltzmann method (LBM) is a relatively new method promising to calculate aerodynamics coupled with aeroacoustics. The present paper deals with the simulation of the aerodynamics and aeroacoustics for a centrifugal fan using the commercial LBM Code PowerFLOW of the Exa Corporation. The focus is on the variation of the mesh size. The aim is to determine the smallest cell size and the geometry defined for refinement in such a way that both the flow and acoustics of the centrifugal fan can be accurately predicted with an acceptable total computing time. At the end a total of four operating points are analysed. The results of the LBM simulation are compared and validated with measurement results. Flow information in terms of the pressure rise as a function of the volume flow rate is well captured. In addition, the noise is well predicted with respect to blade passing frequency.