Free Field Technologies

Transcription

HPC usage on acoustics modeling
Copyright Free Field Technologies!
Agenda
  Free Field Technologies Overview
  Current required HPC ressources around some aeronautic applications
  New challenges for HPC ressources & PRACE response
  Conclusions
2!
  Conclusions
3!
  Free Field Technologies is the leader in CAE:
  Acoustics
  Vibro-acoustics
  Aero-acoustics
  The company has three main activities:
 
 
 
Development of the ACTRAN software suite
Provision of related services:
training, consulting, technology transfer, methodology development, installation and performance
tuning, custom developments, CAE process automation
Research in acoustic CAE and related fields
  Free Field Technologies operates from:
  Mont-Saint-Guibert near Brussels (Headquarters)
  Toulouse
  Tokyo
  ACTRAN is used by over 200 industrial customers worldwide.
4!
The ACTRAN Technology
  Based on Finite Elements Method:
 
 
 
 
Structure Modelling
Acoustic Modelling
Flow Effect
Coupling Effect
  …
  Each element is defined by a list of nodes, representing the unknowns
or Degree of Freedom (DOF)
  Each element is defined by physical properties
  The element size depends on the computed frequency and material
properties
  The Assembly of the elements represents
the problem to solve
5!
The ACTRAN Technology
  Solve an algebraic linear system (complex, unsymmetric) for each
frequency in Three Steps:
  Assemble the matrix system: Zx = B
  Factorize the Z matrix: Z = LU (LU Decomposition)
  Compute the x response of the system (vector)
  Size Systems to solve can be up to 3 Millions unknowns
6!
The ACTRAN software suite
ACTRAN for NASTRAN
ACTRAN Vibro-Acoustics
ACTRAN DGM
ACTRAN Aero-Acoustics
ACTRAN VI
ACTRAN Acoustics
7!
ACTRAN TM
  Conclusions
8!
Nacelle Intake Applications"
  Fan noise is the dominant noise source of modern high-bypass ratio turbofans"
  Prototyping: expensive & time consuming"
  Required attributes for a simulation tool"
 
 
 
 
Includes effect of heterogeneous mean flow"
Liner modeling"
Coupling with duct modes"
Modal Coupling
Frequency domain"
"nacelle"
problem
Acoustic lining
9!
Nacelle intake Modeling"
  From 2D Modelling -> 3D Modelling to compute acoustic radiation"
A380 Nacelle
Axisymmetric model
(the back of the nacelle is not modeled)
  Fast Computation for 2D models but some approximations remains"
  3D models are accurates but limited for high frequencies."
10!
Nacelle intake – HPC ressources"
  2D Modelling – Frequency 5 KHz – 760 KDOF - AIX/Power5 Cluster"
2D
RAM
Solver
(Gb)
RAM
Total (Gb)
1 proc - ic
3
15 procs – ic
3
Factorization
time (s)
Total
time (s)
7
88
35000
7
88
2863
  3D Modelling – Frequency 1 KHz – 3 MDOF - AIX/Power5 Cluster"
Nacelle
RAM
Solver
(Gb)
RAM
Total
(Gb)
Space Disk
Used (Gb)
I/O time
(s)
I/O data
(GB)
Factorization
time
Total
time
1 proc - ooc
23.6
34.8
200.6
26074
2408.2
24h24mn
34h18mn
  Efficient parallel computing method on a limited number of processors"
  Each node requires a large amount of memory"
11!
Exhaust Noise Applications"
  Turbo machinery noise radiating from the bypass and core nozzles is
becoming an important noise source on modern aircrafts"
  Prototyping: expensive & time consuming"
  Required attributes for a simulation tool"
 
 
 
 
 
12!
Non-uniform and Rotational mean flow "
Thick shear layers and thermal gradients"
Liner modeling"
Coupling with duct modes"
Time Domain"
Exhaust Noise Modeling"
  From 2D Modelling -> 3D Modelling to compute acoustic radiation"
2D Axisymmetric Mesh
13!
  Linearized Euler Equations (LEE)
  DGM scheme in the time domain
  Adaptative element order(1
to 16)
3D Mesh
Exhaust Noise – HPC ressources"
  2D Modelling – Freq. 1 KHz – 2060 Elements – Linux Opteron Cluster"
2D
RAM Solver (Mb)
Computation time
48 procs
340
24 mn
  3D Modelling – Freq. 1 KHz – 440 000 Elements – Linux Opteron Cluster"
3D
RAM Solver (Mb)
Computation time
56 procs
4600
45h
  Efficient parallel computing method on a large number of Processors"
  Each node requires a small amount of memory"
14!
  Conclusions
15!
3D Modelling : the high frequencies challenge"
  For 3D Modelling, the model size is:"
  Reach Higher Frequencies require:"
  Robust Graphical User Interface for models building"
  Strong scalability for HPC usage"
  Huge HPC Ressources at affordable price"
Factor on model size   frequency dependant "
  " follow a cubic law."
3D Model size factor 200 175 150 125 100 75 50 25 0 © Aermacchi
16!
1000 2000 3000 Frequency (Hz) Acoustic field
4000 5000 6000 The PRACE Project"
  For the Small CAE Software Enterprise"
  Access to a large number of platform for testing new development in HPC"
  Reproduce the HPC environment of our Tier-1 Company"
  Promote HPC for our customers & prospects"
  For the R&D acoustics Department in SME"
  Increase their CAE activity in reducing HPC costs"
  Reduce their licensing costs via a pay per use activity"
  Improve the quality of their products by a better acoustic prediction"
  Confidentiality data must be guarantee on remote servers"
17!
Some Automotive Customers
18!
Some Aerospace Customers
19!
Some Other References
20!

Free Field Technologies

Transcription

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