FEATURES OF BULDING A GRID FOR 3D MODELING OF A WIND TURBINE

Abstract

The article deals with the problem of constructing a grid for 3D modeling of a wind turbine by a nonstationary air flow. To solve the problem, two grids are constructed: the first from the rotating part, the second from the non-rotating part. Consequently, blockMesh, snappyHexMesh, TransformPoint, reconstructParMesh, mergeMeshes, changeDictionary utilities are used to build the grid as part of the OpenFOAM package. The solution of the main problems in the construction of the grid is determined: the first is a combination of static and moving grid, the second axis of rotation is not parallel to any of the main axes (this fact complicates the engagement with the help of snappyHexMesh and torque estimation).As a result of the data obtained from the constructed grids, the stationary part covers a large amount of space and has a high resolution. For example, the grid of the stationary part constructed with blockMesh consists of 6,750,000 cells, the total number of sides of the grid is 20,385,000, of which 20,115,000 are internal faces, and the rest are the boundaries of the grid. The data of the rotating part shows that the closed grid consists of 2,965,671 cells, 9,447,062 faces and 3,623,151 points. Consequently, the rotating part adapts to the geometry and dynamics of the turbine blades. Based on the data obtained from the constructed grids, the quality and resolution of the grid are analyzed. It is shown that the resulting grid has sufficient accuracy and adaptability to simulate turbulent flows around a wind turbine.