The method of solving aeroelasticity problems for wind blade using open source software

Due to the development of Wind Energy and construction of new wind farms in Russian Federation there is a need for the solution of application-oriented problems and development of effective methods for calculation of wind turbine’s elements. One of the directions for computational continuous mechanics is connected with problems in aeroelasticity (fluid-structure interaction). The possibility of solving one of the problem in aeroelasticity using a complex program approach on the basis of open source software OpenFOAM and Code_Aster is shown in this article. On the example of the blade for wind turbine, 61.5 meters long, the techniques of solving problem for a static and dynamic aeroelasticity in which calculation of flow of the blade with a subsonic air flow is done in OpenFOAM library (solvers simpleFOAM and pimpleFOAM) are considered. The calculation of the intense deformed status of the blade is done in Code_Aster code. The flowcharts for three different approaches for solving problems of aeroelasticity, examples of scripts and command files for data transfer between two codes in the course of calculation are provided in article. The control-volume mesh consisting their hexahedral elements, the total number is about 400000 elements, for calculation of flow around the blade is constructed in OpenFOAM library, the finite-element mesh consisting of triangular shell elements of first order, the total number is 7714, for calculation of the intense deformed status is constructed in Salome-Meca code. The results of calculation are provided in the form of fields for pressure and velocities; graphics for residuals of pressure, velocity, turbulent viscosity; projections of aerodynamic force from time; diagrams of displacement and stress; the values of pressure for two points for the surfaces and displacement of the tip of the blade from time. The calculations are run using resources of UniHUB web-laboratory ISPRAS.