RESULTS OF NUMERICAL MODELING OF THE MECHANICAL AND TECHNOLOGICAL PROCESS OF MOVING THE SEED MATERIAL OF OIL CROPS UNDER THE INFLUENCE OF AIR FLOW

The system of differential equations of the process of moving seeds in the air stream is not generally solved by analytical methods. A solution of such systems is proposed by the finite element method, which is implemented in modeling in the software package STAR-CCM+. When modeling the process by the finite element method, the initial positions, the velocity of the seeds and the air flow are specified. Then, starting from these initial data of given physical laws of contact interaction, the forces acting on each seed in each time interval are calculated. For each seed, the resultant force is computed and the Cauchy problem is also solved on the selected time interval, the result of which is the initial data for the next step. As physical models for numerical modeling, the following were chosen: k-ɛ split-flow turbulence model, gravity field, Van der Waals real gas model, discrete elements model, multiphase interaction model. The method of discrete elements is based on the laws of conservation of momentum and angular momentum for Lagrangian models of a multiphase medium. As a result of the numerical simulation of the mechanical and technological process of moving the seed material of oilseeds under the influence of the air flow, rational regime parameters are determined under the condition of a maximum filling factor θ: effective seed diameter D_p = 3 mm, seed supply Q = 0.03 kg/s and air speed V = 15 m/s