1st AIAA Ice Prediction Workshop

Workshop in Conjunction with the AIAA AVIATION 2021 Forum

All Virtual/Remote Participation
26-29 July 2021


To subscribe to the workshop mailing list send an empty mail to ipw-subscribe@itk.ntnu.no.



·        The first workshop will focus on ice shape comparisons between the 3D/2D codes for cases where experimental ice shapes are readily available.  The ice shapes would be generated on both 2D and 3D geometries for a limited number of configurations and conditions.

·        The intent is to establish a sound baseline of the current capabilities and use this baseline to target the best topics for the follow-on workshops.  This would maximize the number of participants that are potentially interested in such a workshop and minimize the risk of incomplete submissions.

·        There is also strong interest in performing code-to-code comparisons of collection efficiency which is possible for all cases and code-to-experiment comparisons of collection efficiency where such data are available.  It is recognized that a methodology for geometric comparison of ice shapes is also needed and should be a topic of the first workshop


General Information

·        These Ice Prediction Workshops are collaborative in nature, aiming at assessing the icing simulation tools and practices, identify areas of improvement and recommended practices and at sharing knowledge. They should not, therefore, be viewed as competition between codes, groups and/or testing facilities.

·        Ice accretion is, in most cases, a 3D phenomenon and, therefore, 3D modeling and simulation is usually preferred.

·        Great effort has been invested in the research, development, and testing of 2D icing simulation.  2D analysis is still widely used and well accepted. It established the groundwork for 3D methods and, hence, it should be used as a valid reference for comparison whenever applicable.

·        It is important to define a methodology to compare the simulated 3D ice shapes among themselves and with the 3D experimental ice shapes.

·        Icing simulation typically involves four modules: airflow solver, droplet dynamics solver, surface water mass and energy balance module, and ice accretion geometry module. It is important, to try to understand how each module contributes to discrepancies in the final ice shape prediction.

·        When comparing numerical simulation results to experimental simulation results, the uncertainty of both types of simulations needs to be considered, as well as the repeatability of the experimental results at a given facility and, if possible, between facilities.

·        Our intent is to capture best practices in icing simulation, identify current limitations of the 3D tools, and make recommendations about specific areas where more work is needed.


Test Cases (pdf)

Ice Accretion Test Cases Description (pdf)

CADs & Meshes

Experimental Data / (zip)

Data Comparison and Submission Information (pdf)

Ice Mass and Tracing Locations information (pdf)

Submit Data File Formats (zip)

Data Extraction for Collection Efficiency Cases (zip)

Townhall meeting (mp4)

Questions and answers (pdf)



The workshop to take place over four half-days: 26-29 July 2021 from 0900 to 1300 US Eastern Time (GMT -4). You must register for the workshop with AIAA in order to attend.  The registration fee is $99 USD for AIAA members and $199 USD for non-members Please try to complete your registration by Friday, 23 July 2021.
Register here



·        Participant submit results so that volunteers can begin results comparisons—May 14, 2021

·        Volunteers provide initial results comparisons—June 10, 2021

·        Final data submission—June 21, 2021.

·        Develop workshop agenda—End of June

·        Present results at workshop—July 26-29, 2021


Organizing Committee


·        Workshop: Andy Broeren

·        Website: Richard Hann


Last Updated: 13 May 2021