Simplified CFD/CSD Loose Coupling Approach for Rotor Blade Deformation

摘要

An integrated fluid-structure (CFD/CSD) coupled simulation code based on a loose coupling approach has been developed to investigate aeroelastic effects of helicopter rotor blades. Aerodynamic forces are obtained from an Euler solver in moving overlapped grids. The structural deformations are computed using the CFD-obtained aerodynamic forces by assuming periodicity of the aerodynamic forces and blade deformations for each rotor rotation. Several simplifications for the trim adjustment procedure is made so that the CSD code is compact enough to be directly integrated into the integrated JAXA-ov3d code. HART II experimental data is used for the validation of the code. Test validation computation shows fast and stable convergences in trim adjustments, total thrust and moments and the elastic motions.