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Welcome to the website of the Ice Prediction Workshop. We are currently organizing the third workshop which is planned to be held virtually September 21–24, 2026. The first workshop was conducted as the 1st AIAA Ice Prediction Workshop in 2021 during the Aviation Forum (online) and the 2nd Ice Prediction Workshop was held during the SAE International 2023 Conference on Icing of Aircraft, Engines, and Structures in Vienna.

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

The main goal of these workshops is to assess state-of-the-art of icing prediction tools with 2D and 3D experimental data. We aim to provide an impartial forum to evaluating the effectiveness of icing methods and to identify the areas needing additional research and development.

Currently, we are developing the technical work plan for IPW-3, including the selection of new test cases and the formation of focused technical efforts. As part of this, we’ve established two Technical Focus Groups (TFGs)—one on 3D ice shape comparison and another on icing code verification and validation—to ensure deep technical engagement across the community. Learn more.

Latest News

  • Final agenda
  • Draft Agenda and registration
    Dear IPW3 Participants, Please find attached the draft Agenda for the 3rd AIAA Ice Prediction Workshop, September 21–24, 2026. You can register for the workshop on the AIAA website: https://aiaa.org/courses/aiaa-ice-prediction-workshop/
  • Townhall Meeting Video
    We recently held a townhall meeting as part of the 3rd Ice Prediction Workshop — thanks to everyone who joined and contributed to the discussion! If you missed it or want to revisit the key points, you can watch the full recording here.
  • Updates
    We officially kicked-off the 3rd Ice Prediction Workshop on March 17, 2026.  We have scheduled a Town Hall Meeting on April 29, 2026.  Please read the details below: IPW-3 LAUNCHED: Please visit the IPW website http://www.icepredictionworkshop.com for more information on IPW-3 including the test cases and files. We are planning for an all-virtual workshop to be held September 21-24, 2026 from 9:00 am to 1:00 pm Eastern Daylight Time (UTC-04:00).  IPW-3 Introduction Test cases and files Schedule Process for submitting data Participant permissions to share and archive presentations Questions and discussion MS TEAMS INFORMATION FOR TOWN HALL MEETING: The TownContinue reading “Updates”
  • IPW3 officially announced!
    Dear Icing Colleagues, We would like to invite your participation or attendance in the 3rd AIAA Ice Prediction Workshop (IPW-3), taking place online from Monday, September 21 through Thursday, September 24, 2026. Each session will run from 9:00 a.m. – 1:00 p.m. Eastern Time across four half-days. The workshop is being organized by a committee of volunteers representing the AIAA Atmospheric and Space Environments Technical Committee, the SAE AC-9C Aircraft Icing Technology Committee and other organizations. This is the third installment in a series of workshops designed to assess the current capabilities of 3D computational icing simulation tools and comparisonsContinue reading “IPW3 officially announced!”
  • Schedule for IPW3
    Dear all, After extensive work and discussion, the organisational committee of the 3rd Ice Prediction Workshop is pleased to present the preliminary schedule. The current plan is to release the test cases and associated data on 2 March 2026, with participant simulation results due by 1 July 2026. The workshop itself will be held as a virtual-only event in mid-September 2026, with the exact dates to be confirmed. Schedule: Test cases available March 2, 2026 Participant simulation results due July 1, 2026 Virtual-only workshop mid-September 2026 (dates TBD) More information will be provided within the next few weeks.
  • Technical Focus Groups Launched for IPW-3
    The Ice Prediction Workshop is moving to the third round and has established two dedicated Technical Focus Groups (TFGs) to drive collaboration and technical progress in aircraft icing: 🔹 TFG–1: 3D Ice Shape ComparisonLed by Alberto Pueyo, this group is focused on the characterization and comparison of three-dimensional ice shapes. Bringing together experimental and computational experts from across the icing community, the outcomes will directly contribute to the development of SAE ARP5903 through the AC-9C Icing Technology Committee. 🔹 TFG–2: Icing Code Verification and ValidationLed by Thomas Ozoroski, this group is working on improving comparisons between computational icing codes andContinue reading “Technical Focus Groups Launched for IPW-3”
  • Post-IPW2 Updates
    Dear all, We are providing additional data and updates to the IPW2 datasets to strengthen their useability for future use. In particular, the following is added: Pictures of the ice shapes Updated CRM Scans and MCCS Cloud uniformity data Updated MVD and LWC values Updated MCCS Related publication We would also like to highlight the opportunity to submit papers about IPW2 in the upcoming 2024 AIAA Aviation and Aeronautics Forum and Exposition. The abstract deadline is 12 December 2023.
  • Agenda IPW2
    The agenda for the 2nd Ice Prediction Workshop is now available. The workshop will start on Thursday, June 22, from 13:00-15:00. We are looking forward to seeing you in Vienna! Download Agenda IPW2 (version 3)
  • Updates on data submission, processing, and workshop agenda
    Dear IPW2 Participant, Here are the latest updates: DATA SUBMISSION: We encourage participants to submit data, past the April 18 deadline.  Your data will be included, if time and circumstances allow.  The new MCCS tool corrects the following problems: (1) add the ‘-angle’ option to be consistent with the command line stated in ‘IP2_Data_submission_clarificationV2.pdf’ and (2) correct the Tecplot error: ‘tecplot.exception.TecplotLogicError: Plot Type must be Cartesian3D to creat a slide’ when running with the workshop’s grids. <caseN_participantName_cutData.dat> has been updated to specify the optional variables (ice coordinates). WORKSHOP AGENDA: We are working on an agenda for the in-person workshop onContinue reading “Updates on data submission, processing, and workshop agenda”
  • Updates
    Dear IPW2 Participant, We have made several updates to the IPW2 website.  Please read the details below: TOWN HALL MEETING: A recording of the Town Hall meeting on April 4, 2023 is available on the IPW2 website.  You will also find copies of the presentations that include: IPW-2 schedule and milestones Process for submitting data Updated test case information Participant survey results Participant permissions to share and archive presentations Update data processing guidelines and sample data file input formats DATA SUBMISSION CLARIFICATIONS: Additional information for the data submission of participant results with example files. TEST CASES and EXPERIMENTAL DATA: NowContinue reading “Updates”
  • Updates and town hall meeting
    Dear IPW2 Participant, We have extended the data submission deadline to April 18, 2023 and are inviting you to a Town Hall Meeting on April 4, 2023.  Please read the details below: DEADLINE EXTENDED: Participants may now submit processed results by April 18, 2023.  Results submitted after this date may or may not be included in the workshop comparison, depending upon the individual circumstances. TOWN HALL MEETING: You are invited to join the Town Hall meeting planned for April 4, 2023 at 11:00 am Eastern Daylight Time (US and Canada, UTC -04:00).  Here is the Agenda: Questions and Discussion GlobalContinue reading “Updates and town hall meeting”
  • Updates and participant survey
    As we approach the April 1 data submission deadline, there are many updates to pass along.  Therefore, please read this entire letter. WORKSHOP REGISTRATION:  There is no separate registration for the workshop this year.  SAE is including the workshop as a part of the International Icing Conference registration.  The in-person only workshop is scheduled for June 23, 2023.  (www.sae.org/icing) TEST CASES and EXPERIMENTAL DATA: The test case description document was updated on February 23 with additional information for the CRM65 hybrid model cases. More experimental surface pressure data and ice accretion data for the CRM65 Midspan and Inboard model casesContinue reading “Updates and participant survey”
  • Updates and test cases
    Dear IPW2 Participants, Thank you for your interest in the 2nd Ice Prediction Workshop. This letter provides an update of what to expect over the next few months. IN-PERSON ONLY WORKSHOP:  At this time we are planning for an in-person-only workshop to be held on June 23, 2023 in conjunction with the SAE International Icing Conference (www.sae.org/icing). TEST CASES: An updated document describing the test cases along with the geometries (CAD files) and structured/unstructured grids for test cases have been posted on the IPW website: http://www.icepredictionworkshop.com EXPERIMENTAL DATA: Experimental surface pressure data for the CRM65 Midspan and Inboard model casesContinue reading “Updates and test cases”
  • Preliminary schedule
    The preliminary schedule for the 2nd Ice Prediction Workshop has been released: April 1, 2023. Participants submit processed results so that volunteers can begin results comparisons May 30, 2023. Workshop agenda released. June 14, 2023. Participants submit presentations to the committee. June 23, 2023. Conduct the workshop. The finalized cases and more information will be released soon!
  • Announcing the 2nd Ice Prediction Workshop
    Dear Icing Colleagues, I would like to invite your participation or attendance in the 2nd Ice Prediction Workshop scheduled for June 23, 2023 in conjunction with the SAE International Conference on Icing. This workshop is being organized by a committee of volunteers representing the SAE AC-9C Aircraft Icing Technology Committee and the AIAA Atmospheric and Space Environments Technical Committee. This is the second in a series of workshops designed to assess the current capabilities of 3D computational icing simulation tools. We have a dedicated website where you can find more details regarding the test cases: http://www.icepredictionworkshop.com If you would likeContinue reading “Announcing the 2nd Ice Prediction Workshop”
  • Kick-off for 2nd Workshop
    We are officially announcing that the 2nd AIAA Ice Prediction Workshop will be held during the SAE’s International Conference on Icing of Aircraft, Engines, and Structures June 22-23, 2023 in Vienna, Austria. To attend the workshop, participants will have to sign up for the SAE Icing Conference. More information about the Ice Prediction Workshop will be published soon. The preliminary case descriptions can be found here. .
  • Presentations
    The presentations from the workshop are now available here. We thank all participants for their contributions and the interesting discussions.
  • Final Agenda
    The final program for the 1st AIAA Ice Predicton Workshop has been released. Please find the pdf version of the documen there: Final Agenda (pdf) Last updated 20.07.21
  • 6th Update on Workshop, Registration and Submission
    Dear IPW-1 Participant, Here are some friendly reminders regarding the approaching workshop deadlines: DATA SUBMISSION: Thank you for all of the data uploaded to date.  The cut-off date is 21 June 2021.  You may upload data after 21 June 2021, however, there is no guarantee that your data will be included in the workshop if submitted after this date. WORKSHOP AGENDA: The draft agenda currently includes time for discussions at the end of each daily session.  We will release the draft agenda near the end of this month.  The amount of time allocated to each presenter will depend, in part,Continue reading “6th Update on Workshop, Registration and Submission”
  • 5th Update on Data Submission and Registration
    Dear IPW-1 Participant, Here are more updates and information on the upcoming workshop. DATA SUBMISSION: Please continue to upload your data through 21 June 2021.  This action will confirm your participation in the workshop and you will therefore be invited to present your results at the workshop.  You may upload data after 21 June 2021, however, there is no guarantee that your data will be included in the workshop if submitted after this date. WORHSHOP AGENDA: We will release the agenda about one month before the workshop.  The amount of time allocated to each presenter, will depend, in part onContinue reading “5th Update on Data Submission and Registration”
  • 4th Updates on Workshop and Townhall Meeting
    Dear IPW-1 Participant, Here are more updates and information on the upcoming workshop. WORKSHOP DATE & TIME: We have updated the dates and times for the workshop.  The response to our survey indicated that we may have at least 20 participants from around the world, including many from Europe.  Therefore, we have scheduled the workshop to take place over four half-days: 26-29 July 2021 from 0900 to 1300 US Eastern Time (GMT -4). WORKSHOP REGISTRATION: 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.  HereContinue reading “4th Updates on Workshop and Townhall Meeting”
  • 3rd Updates and Townhall Meeting
    Dear IPW-1 Participant, Here are more updates and information on the upcoming workshop. COMPARISON STANDARDS: We have updated the data comparison document with new information (see charts 8-10).  The updated document is available here. DATA SUBMISSION FORMAT AND UPLOAD INSTRUCTIONS: Sample data submission files have uploaded to the website here.  The file “README.Instructions.txt” provides details information regarding how to upload your data. DATA EXTRACTION FOR COLLECTION EFFICIENCY CASES: Tecplot-format surface wrap data files are provided here to interpolate Cp and collection efficiency from the grids provided by the committee.  These are line data files with X Y Z corresponding to the grid coordinates incorporating any angle ofContinue reading “3rd Updates and Townhall Meeting”
  • Ice Mass and Tracing Locations Information
    Dear IPW participants, Please note this new information regarding the locations corresponding to the experimental ice shape tracings, MCCS, scan area and mass values. Please refer to the descriptions and figures in this new document on the website. Best regards, IPW Workshop Team
  • Correction for test case
    Dear IPW-1 Participant, We have made some minor corrections to the air temperature and pressure for Cases 111, 112, 121 and 122.  Please refer to the updated document here.  Also, please complete the participant survey by 31 March, 2021.  The results of this survey are very important for planning the workshop event. Thank you, IPW-1 Organizing Committee We have made some minor corrections to the air temperature and pressure for Cases 111, 112, 121 and 122.  Please refer to the updated document here.  Also, please complete the participant survey by 31 March, 2021.  The results of this survey are very important for planning the workshop event.Continue reading “Correction for test case”
  • 2nd Update on the IPW
    Dear IPW-1 Participant, As you may know by now, AIAA has officially announced that the 2021 Aviation Forum will be an all virtual event.  Furthermore, AIAA has also re-scheduled the virtual event for 2-6 August 2021.  This means that our Ice Prediction Workshop will be conducted as a virtual-only event hosted by AIAA.  The new dates for the virtual only workshop are 27-28 July 2021.  AIAA is currently working on updates to the Aviation Forum website to incorporate these changes.  The remainder of this letter provides more updates and information. COMPARISON STANDARDS: We have posted a new document to the website describing the standardsContinue reading “2nd Update on the IPW”
  • Updates on the IPW
    Dear IPW1 Participant, Thank you for your continued interest in the 1st Ice Prediction Workshop. This letter provides more updates and information as we get closer to the event. TEST CASES and EXPERIMENTAL DATA: All of the information required to set up and run the cases along with the experimental data for comparison should now be available on the workshop website: www.icepredictionworkshop.com COMPARISON STANDARDS: We are finalizing the set of standards for comparison of simulation results to the experimental data. These standards will provide for uniform comparison plots across all participants.  We will notify you when this document is posted to the website. SUBMISSIONContinue reading “Updates on the IPW”
  • Pointwise guidance
    Hello, Please find attached some information about how to import the provided .Ugrid files into Pointwise. Best regards, -Richard
  • Information on Ice Prediction Workshop
    Dear IPW1 Participant, Thank you for your interest in the 1st Ice Prediction Workshop. This letter provides an update of what to expect over the next few months. TEST CASES: Geometries, grids, and icing conditions for test cases have been posted on the following website: www.icepredictionworkshop.com We are in the process of finalizing a document that provides the details required to set up and run the cases.  We will notify you when this document is posted in January. EXPERIMENTAL DATA: We are also compiling the experimental data with the goal to post these data in electronic form on the website by the end ofContinue reading “Information on Ice Prediction Workshop”