METHODOLOGICAL FUNDAMENTALS FOR NUMERICAL NOISE CALCULATION OF A RADIAL FAN FOR DUMP TRUCK VENTILATION SYSTEM USING ANSYS FLUENT
Based on the analysis of literary sources, the methodological foundations of numerical modelling of fan aeroacoustics are formed using the acoustic analogy of Ffowcs Williams-Hawkings. The calculation consists of two stages. At the first stage, the problem of gas dynamics of air movement during rotation of the fan blade wheel is solved. At the second stage, noise indicators are evaluated at selected points in space. In the ventilation system of a dump truck, the maximum air flow speeds do not exceed Mach 0.5. Considering this, the description of the main methods and schemes for calculating gas dynamic processes is obtained by means of Ansys Fluent. The properties of air are described by a model of an incompressible medium with constant physical properties. To estimate the tonal noise characteristic of the dipole type of noise source, it is sufficient to use the turbulence models k-ε RNG and k-w SST. The requirements for the created computational grid are presented, taking into account the chosen method of modelling turbulent formations, as well as for the description of initial and boundary conditions, the creation of interface pairs of surfaces. Recommendations are given for determining the criteria for evaluating the convergence of the solution.