Numerical Simulation of Wind Turbine Rotors Autorotation by Using the Modified LS-STAG Immersed Boundary Method

Abstract EN

A software package is developed for numerical simulation of wind turbine rotors autorotation by using the modified LS-STAG level-set/cut-cell immersed boundary method.

The level-set function is used for immersed boundaries description.

Algorithm of level-set function construction for complex-shaped airfoils, based on Bézier curves usage, is proposed.

Also, algorithm for the level-set function recalculation at any time without reconstructing the Bézier curve for each new rotor position is described.

The designed second-order Butterworth low-pass filter for aerodynamic torque filtration for simulations using coarse grids is presented.

To verify the modified LS-STAG method, the flow past autorotating Savonius rotor with two blades was simulated at Re=1.96·105.