Validation Methods and Results for a Two-Dimensional Ice Accretion Code

A research project is underway at NASA Lewis Research Center (now called JohnH. Glenn Research Center at Lewis Field) to producea library of computercodes thatcanaccurately predict ice growthunderanymeteorological conditions for any aircraft surface. Results are presented from themost recent version of the two-dimensional code LEWICE. This version differs from previous releases due to its robustness and its ability to reproduce results accurately for different point spacing and time step criteria across several computing platforms. It also differs in the extensive amount of effort undertaken to compare the results in a quantiŽ able manner against the database of ice shapes that havebeen generated in the NASA Lewis Icing Research Tunnel. A quantitativemethod is described that has been applied to both the computational and experimental ice shapes. The result of this comparison shows that the difference between the predicted ice shape from LEWICE 2.0 and the average of the experimental data is 7.2%whereas the variability of the experimental data is 2.5%.