Free Field Technologies - PRACE Research · PDF fileAero-acoustics ... 3D Modelling –...
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Transcript of Free Field Technologies - PRACE Research · PDF fileAero-acoustics ... 3D Modelling –...
2! 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
3! Copyright Free Field Technologies!
Free Field Technologies Overview
Current required HPC ressources around some aeronautic applications
New challenges for HPC ressources & PRACE response
Conclusions
4! Copyright Free Field Technologies!
Free Field Technologies
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.
5! Copyright Free Field Technologies!
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
The ACTRAN Technology
6! Copyright Free Field Technologies!
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
The ACTRAN Technology
7! Copyright Free Field Technologies!
The ACTRAN software suite
ACTRAN Vibro-Acoustics ACTRAN Aero-Acoustics ACTRAN TM
ACTRAN Acoustics
ACTRAN DGM
ACTR
AN V
I
ACTRAN for NASTRAN
8! Copyright Free Field Technologies!
Free Field Technologies Overview
Current required HPC ressources around some aeronautic applications
New challenges for HPC ressources & PRACE response
Conclusions
9! Copyright Free Field Technologies!
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" Frequency domain"
Acoustic lining
Modal Coupling
"nacelle" problem
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Nacelle intake Modeling"
From 2D Modelling -> 3D Modelling to compute acoustic radiation"
Fast Computation for 2D models but some approximations remains"
3D models are accurates but limited for high frequencies."
Axisymmetric model (the back of the nacelle is not modeled)
A380 Nacelle
11! Copyright Free Field Technologies!
Nacelle intake – HPC ressources"
2D Modelling – Frequency 5 KHz – 760 KDOF - AIX/Power5 Cluster"
3D Modelling – Frequency 1 KHz – 3 MDOF - AIX/Power5 Cluster"
Efficient parallel computing method on a limited number of processors"
Each node requires a large amount of memory"
2D RAM
Solver (Gb)
RAM Total (Gb) Factorization
time (s) Total
time (s)
1 proc - ic 3 7 88 35000
15 procs – ic 3 7 88 2863
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
12! Copyright Free Field Technologies!
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" Non-uniform and Rotational mean flow " Thick shear layers and thermal gradients" Liner modeling" Coupling with duct modes" Time Domain"
13! Copyright Free Field Technologies!
Exhaust Noise Modeling"
From 2D Modelling -> 3D Modelling to compute acoustic radiation"
Linearized Euler Equations (LEE) DGM scheme in the time domain Adaptative element order(1 to 16)
3D Mesh 2D Axisymmetric Mesh
14! Copyright Free Field Technologies!
Exhaust Noise – HPC ressources"
2D Modelling – Freq. 1 KHz – 2060 Elements – Linux Opteron Cluster"
3D Modelling – Freq. 1 KHz – 440 000 Elements – Linux Opteron Cluster"
Efficient parallel computing method on a large number of Processors"
Each node requires a small amount of memory"
2D RAM Solver (Mb) Computation time
48 procs 340 24 mn
3D RAM Solver (Mb) Computation time
56 procs 4600 45h
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Free Field Technologies Overview
Current required HPC ressources around some aeronautic applications
New challenges for HPC ressources & PRACE response
Conclusions
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3D Modelling : the high frequencies challenge"
For 3D Modelling, the model size is:" frequency dependant " " follow a cubic law."
Reach Higher Frequencies require:" Robust Graphical User Interface for
models building" Strong scalability for HPC usage" Huge HPC Ressources at affordable
price"
Acoustic field © Aermacchi
0 25 50 75 100 125 150 175 200
1000 2000 3000 4000 5000 6000
Factor on mod
el size
Frequency (Hz)
3D Model size factor
17! Copyright Free Field Technologies!
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"