Second Workshop on Benchmark problems for Airframe Noise Computations (BANC II)

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Preliminary Announcement



May 10, 2011

Second
Workshop on Benchmark problems for Airframe Noise Computations

(
BANC



I
I
)

Sponsored by the Aeroacoustics and Fluid Dynamics Technical Committees, the
B
ANC
-
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 w
ill 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 elemen
t 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 unstead
y 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 be
st 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 envisio
ned 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 significantl
y 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 incl
ude 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.

Minima
l 4
-
wheel landing gear
, and

4.

Partially
-
dressed, cavity
-
closed nose landing gear
,

the BANC
-
II Workshop will include

5.

The LAGOON Simplified Landing Gear configuration tested by ONERA,

and one or more of the following three additional categories:

6.

Slat Noise (D
LR Configuration)

7.

Sl
at Noise (NASA led effort on a

modified
30P30N Configuration

8.

Acoustic Propagation Phase of Airframe Noise Prediction


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

1.

Non
-
proprietary and of wide in
terest

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 details and format are currently in the process of being finalized. The workshop
is expected to be held on June
7
-
8
, 201
2, immediately a
fter the 18
th
AIAA/CEAS
Aeroacoustics
Conference in
Colorado Springs, Colorado, USA
.
D
escriptions of
the BANC
-
I
workshop
problems are available at the discussion group website
:

https://info.aiaa.org/tac/ASG/FDTC/DG/BECAN_files_/Workshop_June_2010_Final_problem_Statements

Revised problem statements, including geometry definitions and the latest information about the
BANC
-
II
workshop, will be post
ed at the discussion group website. 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.


This preliminary announcement is intended to make all potential stakeholders aware of this
work
shop.
Those with an interest in participating in this workshop should contact one of
the undersigned immediately so that their names may be added to the mailing list for
future information about the workshop.


Meelan Choudhari (
Meelan.M.Choudhari@nasa.gov
), and

Miguel Visbal

(
Miguel.Visbal@wpafb.af.mil
)

Co
-
chairs,

AATC/FDTC Discussion Group on Benchmark Experiments
&

Computations for Airframe Noise



Pr
oblem category leads
:

1.

Trailing edge Noise:
Roger Drobietz

(
roger.drobietz@ge.com
)


2.

Inline Tandem Cylinders: David P. Lockard (
D.P.Lockard@nasa.gov
)

3.

Minimal 4
-
wheel l
anding gear
: Philippe R. Spalart (
philippe.r.spalart@boeing.com
)


4.

Nose

landing gear
: Mehdi R. Khorrami (
mehdi.r.khorrami@nasa.gov
)

and Thomas Van de
Ven

(
Thomas.VandeVen@gulfstream.com
)

5.

ONERA LAGOON Landing Gear Configuration: Eric Manoha
(
eric.manoha@onera.fr
)

6.

DLR Slat Noise Configuration: Jan Delfs

(
jan.delfs@dlr.de
)

7.

NASA Slat Noise Configuration: Meelan Choudhari
(
Meelan.M.Choudhari@nasa.gov
)
,
Mehdi Khorrami (
mehdi.
r.khorrami@nasa.gov
) and David Lockard
(
D.P.Lockard@nasa.gov
)

8.

Acoustic Propagation Phase of Airframe Noise Prediction:
Tomoaki Ikeda
(
ikedat@chofu.jaxa.jp
),
Taro

Ima
mura (
imamura.taro@jaxa.jp
), Leonard Lopes
(
leonard.v.lopes@nasa.gov
), and Stephane Redonnet

(
Stephane.Redonnet@on
era.fr
)