To showcase of the co-simulation capabilities between LMS Imagine.Lab Amesim and STAR-CCM+, Siemens PLM Software presents this feature through a study of the thermal and airflow characteristics in an avionics equipment bay. The bay geometry is simplified, and the fluid flow within the bay is simulated in STAR-CCM+. The thermal characteristics of electronic cards (contained in their enclosures) are simulated in LMS Amesim, especially the heat generation due to the consumption of electrical power. The study demonstrates the advantages that can be had from co-simulating two powerful software packages, respectively specializing in the system simulation and CFD domains. More information: http://www.plm.automation.siemens.com/en_us/products/lms/imagine-lab/aerospace/electrical-aircraft.shtml

1. Realize innovation.
LMS Amesim / STAR-CCM+
co-simulation: electric
equipment bay of an aircraft
LMS Imagine.Lab Amesim™
A world leading platform for physical
simulation of mechatronic systems
Restricted © Siemens AG 2017

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Table of contents
• Introduction to the product portfolio
• Motivation for this co-simulation study
• Setup of the 1D LMS Amesim model
• Setup of the 3D STAR-CCM+ model
• Results of the LMS Amesim / STAR-CCM+ co-simulation
• Going further

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Simcenter™ Portfolio for Predictive Engineering Analytics
LMS Imagine.Lab
LMS Imagine.Lab Amesim
LMS
Imagine.Lab
System
Synthesis

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STAR-CCM+
Simcenter™ Portfolio for Predictive Engineering Analytics
STAR-CCM+

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Cloud
Licensing
flexibility
Simcenter™ Portfolio for Predictive Engineering Analytics
Cornerstones for a future-proof engineering approach
Covering full range of
methods
Analytics, reporting &
exploration
Deployment flexibility
Openness &
Scalability
User experience
Industry &
engineering expertise
Systems approach
Collaboration &
workflow
Multidiscipline
& multiphysics
R
F
L
P
Controls
1D
3D
TEST
CFD

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Table of contents
• Introduction to the product portfolio
• Motivations for this co-simulation study
• Setup of the 1D LMS Amesim model
• Setup of the 3D STAR-CCM+ model
• Results of the LMS Amesim / STAR-CCM+ co-simulation
• Going further

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Presentation of the electric equipment in an avionics bay
• This study demonstrates the LMS Amesim / STAR-
CCM+ co-simulation feature’s ability to solve dynamic
complex thermal problems with 1D detailed electric
equipment models for testing their cooling efficiency.
• It is focused on the electric equipment in an avionics
bay. It is based on an existing CAD, except it’s
simplified here.
• The aim is to refine the thermal behavior for various
operating points in a multi-physics simulation of an
avionics bay.
STAR-CCM+ has a dedicated user interface to connect to LMS Imagine.Lab Amesim
that makes the co-simulation process easy to set-up.
Airbus A330 avionics bay

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The test case under consideration
Test-case: thermal study of the cooling of electric
equipment contained in an aircraft avionics bay
Typical dissippated power: 3kW
• Co-simulation is a valued approach for
improving both 1D and 3D CFD results
• Understand system interactions
• Best of 3D CFD and 1D System worlds
• Addressing RTD partners’ initiatives based
on Aerospace customers’ use cases
• Offering new virtual capabilities
Motivations
3D CFD and 1D system simulation are complementary.

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Table of contents
• Introduction to the product portfolio
• Motivations for this co-simulation study
• Setup of the 1D LMS Amesim model
• Setup of the 3D STAR-CCM+ model
• Results of the LMS Amesim / STAR-CCM+ co-simulation
• Going further

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1D LMS Amesim model of the electronic card with its enclosures
Discretization
• 1 electronic card → 6 thermal masses
• 1 enclosure’s face → 1 thermal mass
Physical model
• Convection
• Radiation inside the enclosure
• Conduction between each face in contact.
Representation of the 1D discretizationLMS Amesim representation of the electronic card

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1D LMS Amesim model of the electronic card with its enclosures
From
LMS
Amesim to
STAR-CCM+
From
STAR-CCM+
To LMS
Amesim
We choose as many inputs (ports at right)
and outputs (ports at left) as the simulation
requires.
Communication with TCP/IPX2 sketches since 2 enclosures are included

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Table of contents
• Introduction to the product portfolio
• Motivations for this co-simulation study
• Setup of the 1D LMS Amesim model
• Setup of the 3D STAR-CCM+ model
• Results of the LMS Amesim / STAR-CCM+ co-simulation
• Going further

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3D STAR-CCM+ model of the avionics equipment bay
• The global volume represents a simplified version
of an avionics equipment bay
• Geometry reduced to rectangular shapes
• Two inlets with the same flow rate model the inlet
diffuser
• Configurable rectangular enclosures
Boundary conditions
• Mass flow inlet controlled (50g/s)
• Tinlet imposed (15°C)
• Pcard imposed, can be time-dependent.
• Calculated mass flow inside each enclosure
Simplified part of an avionic bay

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3D STAR-CCM+ model of the avionics equipment bay
Numerical model
• Implicit unsteady
• SST model
• Segregated solver
Hypothesis
• Adiabatic walls
• Pressure boundary conditions at the inlet of
the enclosures
• The thermal behavior of the supports inside
the bay is neglected
Meshing
• 24k polyhedral cells for 2 enclosures
• Boundary layer refinement around enclosures
Automatic local mesh refinement

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Table of contents
• Introduction to the product portfolio
• Motivation for this co-simulation study
• Setup of the 1D LMS Amesim model
• Setup of the 3D STAR-CCM+ model
• Results of the LMS Amesim / STAR-CCM+ co-simulation
• Going further

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Overview of the LMS Amesim / STAR-CCM+ co-simulation process
LMS Amesim

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• Evaluates the physics outside the enclosure
• Only fluid domain
• Outputs :
• Heat transfer on each face
• Mass flow inside the enclosure
• Temperature of the fluid coming into the
enclosure
LMS Imagine.Lab Amesim / STAR-CCM+ co-simulation boundary conditions
Temperature in STAR-CCM+ imposed from LMS Amesim
• Evaluates the physics inside the enclosures
• Outputs :
• Temperature on each face of the enclosure
• Temperature of the fluid inside the enclosure
LMS Amesim
STAR-CCM+

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Results of the LMS Imagine.Lab Amesim / STAR-CCM+ co-simulation
• Co-simulation process is accurate
• Complex flow field in the bay
• Coupled behavior between the enclosures
• The position of an enclosure has an impact
on its cooling efficiency
Temperature of each electronic card Temperature profile and streamlines

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Conclusion for this LMS Imagine.Lab Amesim / STAR-CCM+ co-simulation
Airbus A330 avionics bay
Direct interactions: changing the
1D model impacts the 3D model
Challenging Aerospace cases are
addressed with realistic results obtained
Benefit from
best of both
3D CFD and
1D System
worlds

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Table of contents
• Introduction to the product portfolio
• Motivation for this co-simulation study
• Setup of the 1D LMS Amesim model
• Setup of the 3D STAR-CCM+ model
• Results of the LMS Amesim / STAR-CCM+ co-simulation
• Going further

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STAR-CCM+ / LMS Amesim co-simulation user guide in LMS Amehelp

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Systems-Driven Product Development
Predictive Engineering Analytics
Role in Systems-Driven Product Development
Predictive Engineering AnalyticsSystem Mockup
Managed in PLM Context - Multi-Domain Traceability, Change and Configuration
TEST
Digital
Twin
1D
CFD
Exploration - Analytics - Reporting
3D

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3D SIMULATION
CFD SIMULATION
1D SIMULATION
From disconnected models and data …
Customer Usage data
Simulation data
Test data TEST MODELING
Historical data
CONTROLS

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…to a performance Digital Twin
3D SIMULATION
CFD SIMULATION
1D SIMULATION
Customer Usage data
Simulation data
Test data TEST MODELING
Historical data
CONTROLS

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Contact
Karim NASSAR & Stéphane NEYRAT | LMS Amesim Platform
Deniz UNLU & Olivier BROCA | LMS Amesim Aerospace and
Defense
Peter MENDOZA & Joe OSMAN | CD-adapco
Siemens Industry Software S.A.S.
Digital Factory Division
Product Lifecycle Management
Simulation & Test Solutions
DF PL STS CAE 1D | CD-adapco
siemens.com