Assessment of the PoliMIce Toolkit From the 2nd AIAA Ice Prediction Workshop

This paper presents the Politecnico di Milano Icing Research Group’s contribution to the 2 nd AIAA Ice Prediction Workshop. Test cases include ice accretion over two models representing the inboard (20 percent semispan) and midspan (64 percent semispan) stations of a wing based upon a 65 percent scale version of the Common Research Model (CRM) aircraft. Three different ice regimes are considered for each test case, resulting in a rime, mixed, and glaze regime. The numerical predictions are evaluated and compared to high-quality experimental measurements taken from the NASA Glenn Icing Research Tunnel. The last test case considered is the ice accretion over a small wing at low-speed velocity. This is a validation case for low Reynolds number icing, which usually occurs over unmanned aerial vehicles due to the smaller airframe size and lower airspeeds. Single-step, multi-step, and semistochastic simulations are carried out for the considered test cases, highlighting different numerical accretion mechanisms for the different icing regimes. In general, the numerical predictions compare favorably with the experimental measurements. However, there remains scope for further improvement of numerical models, as highlighted by the more challenging test cases such as mixed icing over swept wings, which result in complex 3D ice scallops.