March 6 - 8, 2017 | Berlin
LEADING ENGINEERING SIMULATION CONFERENCE
Azipod® propulsor in oblique flow at full scale: Comparison between traditional approach and fully coupled FSI for propeller stress analysis
Quite recently CD-adapco - A Siemens Business added finite element solver capability to STAR-CCM+® product family. In this study, Azipod® propulsor is simulated in oblique flow at full scale by two approaches: traditional method when first unsteady RANS CFD is used for simulating propeller thrust and torque and then pressure and wall shear stresses on propeller surfaces are exported at predefined time intervals from STAR-CCM+ and imported to third party software for stress FEM analysis or using fully coupled transient Fluid Structure Interaction (FSI) feature within STAR-CCM+. In the CFD analysis, SST (Menter) k-w turbulence model with the transient sliding mesh approach is used and STAR-CCM+ v11.02.009 is applied in the fully coupled FSI analysis. In this paper, importance of data transfer and mapping between CFD and FEM meshes is addressed and stress distribution on propeller surfaces at several radii are compared from two separate finite element analysis. Finally, comparison between benefits and drawbacks of these two approaches is discussed.