May 22, 2012

Second Workshop on Benchmark problems for Airframe Noise Computations


Sponsored by the Aeroacoustics and Fluid Dynamics Technical Committees, the BANC-II workshop will address the computations of unsteady flow and noise radiation for a select set of airframe noise configurations for which experimental data is already available or is expected to be available in the near future.  The BANC-II Workshop will build upon the foundation of the BANC-I Workshop to enable a more definitive assessment of the state-of-the-art including gap areas in the computations and measurements of airframe noise, as well as include a substantially stronger collaborative element involving multiple organizations from the outset.


Objectives of the BANC-II workshop are to:

1.      Provide a forum for a thorough assessment of simulation-based noise-prediction tools in the context of airframe configurations including both near-field unsteady flow and the acoustic radiation generated via the interaction of this flow with solid surfaces.

2.      Identify current gaps in physical understanding, experimental databases, and prediction capability for the major sources of airframe noise.

3.      Help determine best practices, and accelerate the development of benchmark quality datasets.

4.      Promote future coordinated studies of common configurations for maximum impact on the current state of the art in the understanding and prediction of airframe noise.


It is envisioned that the BANC-I problem categories will continue to be of interest to the airframe noise (AFN) community, including those who were unable to participate in BANC-I and those who did but are continuing to work on those problems and will have significantly new developments to report during BANC-II. The original problem statements will be scrutinized for potential improvements. To broaden the portfolio of BANC datasets (including additional sources related to high-lift noise), the BANC-II workshop will include new problem categories if sufficient interest is identified.  Specifically, in addition to the four problem categories from the BANC-I workshop:

  1. Airfoil trailing edge noise,
  2. Unsteady wake interference between a pair of inline tandem cylinders,
  3. Minimal 4-wheel landing gear, and
  4. Partially-dressed, cavity-closed nose landing gear,

the BANC-II Workshop will include

  1. The LAGOON Simplified Landing Gear configuration tested by ONERA,

and one or more of the following three additional categories:

  1. Slat Noise (DLR Configuration)
  2. Slat Noise (NASA led effort on a modified 30P30N Configuration
  3. Acoustic Propagation Phase of Airframe Noise Prediction


The workshop configurations reflect a compromise based on several criteria, including:

  1. Non-proprietary and of wide interest
  2. More realistic than previous Computational AeroAcoustics (CAA) benchmarks, providing a balance between geometric complexity, relevant physics, computational requirements, and experimental constraints
  3. Experiments conducted in more than one facility, with measurements addressing the full causal chain from unsteady flow structures to far-field acoustics.


The workshop will be held on June 7-8, 2012, immediately after the 18th AIAA/CEAS Aeroacoustics Conference in Colorado Springs, Colorado, USA.   A preliminary version of the workshop agenda is available here:

The guidelines for presenters are here:

Descriptions of problem statements for the previously held BANC-I workshop in June 2010 are available at the discussion group website:

Problem statements for all BANC-II categories are available from the respective folders that may be accessed by following the links provided at the bottom of this webpage. 


Even though the workshop includes the combined consideration of unsteady flow near airframe components and the resulting acoustic radiation, joint contributions based on complementary capabilities are also encouraged.  As noted above, the BANC-II Workshop may also include a separate category dedicated to the acoustic propagation phase of the airframe noise prediction process.


Those with an interest in participating in the workshop should submit a Notice of Interest in the BANC_II workshop by submitting their contact information via the online form at:

This would enable their names to be included in the mailing list for future information about the workshop.  They should also register for the workshop at the AIAA website using the registration form for the Aeroacoustics Conference. Registration queries may be directed to Sandra Turner at  Any additional queries should be directed to one of the following.  


Meelan Choudhari ( and Miguel Visbal (


AATC/FDTC Discussion Group on Benchmark Experiments & Computations for Airframe Noise



Problem category leads are listed below.  The category titles are also linked to the corresponding folder containing the problem statement and other relevant information (depending on availability) for that particular category.  Please contact the category leads for further information and/or regarding any queries.

1.      Trailing edge Noise: Michaela Herr (, Christopher Bahr (, and Mohammad Kamruzzaman (

2.      Inline Tandem Cylinders: David P. Lockard (

3.      Minimal 4-wheel landing gear: Philippe R. Spalart (

4.      Nose landing gear: Mehdi R. Khorrami ( and Thomas Van de Ven (

5.      ONERA/Airbus LAGOON Landing Gear Configuration: Eric Manoha ( and Bastien Caruelle (

6.      DLR Slat Noise Configuration: • Michael Pott-Pollenske, (, Jan Delfs (, and Eric Manoha (

7.      NASA Slat Noise Configuration: Meelan Choudhari (, Mehdi Khorrami ( and David Lockard (

8.      Acoustic Propagation Phase of Airframe Noise Prediction: Leonard Lopes (, Tomoaki Ikeda (, Taro Imamura (, and Stephane Redonnet (