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LEWICE has been in continual development since 1983 and has a large user base.


Airflow pattern over simulated ice shape Animated 3D aircraft engine
LEWICE Versions
LEWICE 2.0 (current version): 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 quantifiable manner against the database of ice shapes which have been generated in the NASA Lewis Icing Research Tunnel (IRT). The complete set of data used for this comparison is available in NASA CR 208690. 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% while the variability of the experimental data is 2.5%. The user's manual for this software is available as NASA CR 209409. These improvements were developed at Dynacs Engineering Company and at the NASA Glenn Research Center under NASA funding.

LEWICE/Thermal 1.6: This software analyzes the performance of a bleed air anti-icing system running in either evaporative or running-wet mode. It contains a unique runback model which accounts for the rivulet formation of residual ice growth and would also output residual ice thicknesses if the bleed air failed to provide sufficient heat. Although not linked directly to LEWICE, it could read LEWICE output files for the flow, collection efficiency and heat transfer data.

ANTICE 1.0: This software coupled the de-icing system described below with LEWICE 1.6 and was released at the inaugural LEWICE workshop in 1995. It added capabilities for temperature dependant heaters, improved stability and better runback control.

LEWICE 1.6: This version improved the ice accretion capabilities of the LEWICE code, especially in the glaze ice regime, and to add features to the code which give it greater flexibility and usefulness. These improvements were primarily in four areas: the paneling of the surface and definition of the control volumes were improved to obtain more consistent results and to run more time steps; the impingement limit searches were improved to obtain better limits for multi-drop size cases; the roughness size routines were improved to eliminate the need for a sand-grain roughness input by the user; finally, a multi-body capability was added. This version was released at the inaugural LEWICE workshop in June 1995. These improvements were developed at NYMA, Inc. and at the NASA Lewis Research Center under NASA funding.

LEWICE 1.3:
As usage of the code increased, both in industry and at NASA Lewis, several errors were detected and fixed in the code and several new features were added. These new capabilities were documented in CR 195387, Update to the NASA Lewis Ice Accretion Code LEWICE. This version was initially released in June 1993 as LEWICE Beta.

LEWICE/Thermal 1.0: This software analyzed the performance of an electrothermal de-icing system which could have a large variety of heaters, heater cycles, different materials (including anisotropic properties), variable ice growth, and ice shedding. It was coupled to LEWICE 1.0, which provided the flow solution, collection efficiencies and heat transfer coefficients to the system. This version was released in 1991 with documentation, with the official user manual released in 1994 as NASA CR 4530.

LEWICE 1.0: Through additional funding by NASA Lewis, interactive graphics capabilities were added for mainframe computers and a correlation for surface roughness were added. The code's capabilities and usefulness were documented in CR 185129, Users Manual for the NASA Lewis Ice Accretion Code, LEWICE.

LEWICE 0.5: Through funding by FAA and NASA Lewis, in 1987 the previous codes were combined into a form usable by industry and distribution began.

LEWICE 0.1: In 1983 three computer codes were developed as a result of university grants and in- house research at the NASA Lewis Research Center: a potential flow code, a droplet trajectory code, and an energy balance code. This combined effort, which was called LEWICE, was used exclusively for in-house research at Lewis.

 
Contact Information
Technical Contact
William Wright
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