Multi-shot Icing Simulations with Automatic Re-meshing 2019-01-1956
A fully automated CFD mesh generation technique has been developed and implemented for 3D aircraft icing simulations to permit robust 45-minute ice accretion simulations in support of icing certification campaigns. The changes in the shape of the aircraft surfaces due to accreting ice and their effects on the air and droplet flow are accounted for in a quasi-steady manner by subdividing the total icing time into sequential steps of shorter duration, updating the computational grid at each step. This “multi-shot” ice accretion approach requires robust and accurate grid re-meshing for a successful integration in aircraft design and analysis workflows. ANSYS FENSAP-ICE has been coupled to Fluent Meshing to leverage its generic and highly automated surface displacement algorithm with powerful mesh wrapping tools. A wide spectrum of geometries is supported, ranging from full size aircraft to air data probes, turbomachinery components, rotors and propellers. With this technology, no user intervention is necessary to simulate a 45-minute ice accretion on a complete aircraft in support of icing certification campaigns. The result shown include 45-minute ice accretion simulation on a full-size swept-wing commercial jetliner in high-lift configuration, 18-minute ice accretion and performance degradation on a swept wing, blockage of an isolated turbomachine IGV row, Pitot-tube blockage, and icing on a propeller blade. For completeness, two NACA0012 airfoil validation cases are shown with comparison to icing tunnel tracings.
Isik Ozcer, David Switchenko, Guido S. Baruzzi, Jian Chen
International Conference on Icing of Aircraft, Engines, and Structures