Fluid Dynamics Challenges in Flight Mechanics WG

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Oct 24, 2013 (3 years and 8 months ago)

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Fluid Dynamics Challenges in Flight Mechanics WG

For AIAA FD/APA TC Joint Working Group meeting

San Antonio, June 21st, 2009

2

Topics


Objective and Approach


After the White Paper


formation of Working Group


Outline JWG plan


San Antonio 2009 Invited Session


Interesting Topics by Speakers from Industry and Government


Orlando 2010 focal topics


Transonic SWBLI


Smooth
-
surface separation


Working up workshop definitions/protocols


Work to be done by JWG before Orlando 2010


3


Objective


Identify (and try to close) gaps in flight mechanics (pitch
-
up, buffet, wing
-
drop,
etc
.)
CFD prediction capability
based on relevant fluid dynamic phenomena

-

Relate flight mechanics issues to fluid mechanics responsible for handling issues (
e.g
.,
transition, shock/boundary
-
layer interaction, separation, unsteadiness, etc.)

-

Not focused on a single vehicle geometry

Approach


Produce White Paper to identify specific flow phenomena which have problematic
consequences for the flying qualities of aircraft


Develop Workshop(s) (with specific geometries) to evaluate CFD predictions and
define needs for additional experimental data where necessary


Joint effort between APA and other TC’s (FD, AFM, and Flight Test) as well as
Academia. Plan to coordinate with RTO on fundamental issues

Fluid Dynamics Challenges in Flight Mechanics

4

After the White Paper


formation of Working Group


White Paper developed by APA sub
-
TC (Vehicle Aerodynamics)


“Taxonomy of Flight Mechanics Issues for Aircraft, and underlying Fluid
-
Dynamics
Phenomena”, AIAA
-
2009
-
0744. Presented at Orlando 2009


Well
-
received by stakeholders


Industry representatives on APA/FD TCs


Government representatives and budget holders (AFRL/NASA)


AIAA Public Policy team


suggest development into a position paper


Working group inaugurated at Orlando


Members from AFM, APA and FD TCs


Need to ensure balanced team


Additional members co
-
opted as necessary


Required knowledge base/skill set will evolve through the life of the working group


Approximately fortnightly conference call to progress agenda

5

Current Working Group Membership (May 2009)


AFM TC


Ashok Gopalarathnam (NCSU)


APA TC


Eric Charlton (Lockheed Martin)*


Stephen McParlin (QinetiQ)


Robert Tramel (Kord technologies)


Paul Vijgen (Boeing)*


FD TC


Mark Glauser (Syracuse University)


Michael Ol (AFRL)


Carl Tilmann (AFRL)*


Others


Mike Fremaux (NASA)


Charles Hirsch (Ercoftac)


Rich Wahls (NASA)

*rotated off TC, still on WG

6

Outline plan for Working Group (1)


Working Groups are expected to have a three
-
year life and a
clear set of deliverables.


In year 1:


Publication of White Paper (Orlando 2009)


First invited session to expound issues (San Antonio 2009)


In year 2:


Focus on specific flow phenomena


Transonic SWBLI


Smooth
-
surface separations


Invited sessions covering experimental knowledge base for focus areas
(Orlando 2010)


Definition of experimental basis for workshops (Chicago 2010)


Session on modeling of causative flow phenomena in CFD?


7

Outline plan for Working Group (2)


In year 3:


Publish statement on postulated causative flow physics for use by
workshop participants (by Orlando 2011)


Release test case geometry and flow conditions (Orlando 2011)


Have halfway workshop session(s) in Hawaii 2011


Final workshop and results targeted ASM 2012


Effort needed:


Definition of experimental data sets (need FD lead)


Agree methodology for comparing CFD results


Agree how to test incremental effect of new physics in CFD


JWG can benefit from logistic experiences of Drag Workshops

8

San Antonio 2009 Invited Session


Thursday morning June 25, 08:00
-
11:30, have excellent
speakers and topics:

1.
Atlee Cunningham, LM Fort Worth, “Real
-
life adventures with unsteady
aerodynamics”

2.
Jerry Jenkins, AFRL, “Nonlinear and time
-
dependent aerodynamic
characteristics: Implications for testing and flight mechanics analysis”

3.
Mike Fremaux, NASA Langley, “NASA COMSAC Project: Lessons
Learned”

4.
Dan Vicroy, NASA Langley, “Overview of RTO AVT
-
161 Assessment of
Stability and Control Prediction Methods for NATO Air and Sea
Vehicles”

5.
Open discussion forum


WG to meet after session to review feedback and programme


Audience participation/buy
-
in sought

9

Orlando ASM 2010


focal topics of invited sessions


Identifying/firming up on invited speakers


Transonic SWBLI


Holger Babinsky/Piotr Doerffer


TBD from Boeing Commercial on buffet


Smooth
-
surface separation


Murray Tobak, NASA Ames (retd.)


Jim Luckring, NASA Langley (?)


Tony Hutton, Airbus (?)


Suggestions for possible further speakers


Frank Lynch (Douglas, retired)


Joe Chambers (NASA Langley, retired)


ONERA person on buffet


Use “information triad” as a basis to categorize papers?


Suggest FD TC (Mark Glauser et al.) incorporate into the structure

10

Tasks for consideration before/at Orlando ASM 2010 (1)


We want to identify the primary causative fluids
phenomena


Ensure these are modeled in CFD


Identify useful empiricisms where appropriate


How do we disseminate this information?


Where are there gaps in understanding?


Review existing experimental data sets


Where are there known discrepancies between CFD and
experiment


Make case for ‘building block’ experiments as gap fillers


11

Tasks for consideration before/at Orlando ASM 2010 (2)


“Unfinished business” Public Policy aspects


Develop the White Paper into a AIAA position statement ?


Plan is to meet with Jim Keenan in San Antonio and find out whether White
Paper could be the basis for AIAA position statement


(format, requirements, customer, approval chain, sign
-
off)


Copies of oral presentations at JWG Special Sessions


Need to agree on what to do with copies of oral presentation PPTs


Recommend to request authors/presenters that at least a copy of their PPT
is allowed to be available within Joint Working group for planning and
coordination.


Can we put presentations on JWG sharepoint ? What is AIAA policy ?


Further develop active participation from AFM and Flight Test TC’s

12

Possible Joint WG Publications after 2009 White Paper


White paper (AIAA
-
2009
-
0744) addressed several
topics. Paper could provide basis for follow
-
on paper(s)
developed by Joint WG members


Further develop postulated causative flow physics for specific
relevant flight mechanical topics


Examples of practical issues (“case studies”)


Summary (by WG members) of oral papers presented in San
Antonio and Orlando Special Sessions


Publication by Special Session authors


Introductions to Workshop

13

Need to Populate AIAA SharePoint for JWG activities


https://info.aiaa.org/tac/ASG/APATC/default.aspx


Recommend (restricted
-
access) folder for JWG
members


Can we use this Sharepoint in 2010+ for workshop test
cases ?


Jim Guglielmo has suggested a distinct WG site on the
AIAA server. He can set up a site, but we need to
decide how to run it. Any volunteers?


14

Need to identify focal points within JWG


Maintain Sharepoint site.


Public policy version of White Paper.


Session chair to organise process for Transonic SWBLI.


Session chair to organise Smooth Surface Separation.


I can do this one. Need volunteers for others [SMcP]


Liaise with NASA on RTO and relevant special
publications.


Start defining possible cases for workshops.


Recruitment from new TC members (esp. FD)

15

16

Manoeuvre limits for combat aircraft