LMS Amesim / STAR-CCM+ co-simulation: Thermal analysis of a combustion chamber Realize innovation. Unrestricted © Siemens AG 2016 LMS Imagine.Lab Amesim™ A world leading platform for physical simulation of mechatronic systems
Apr 21, 2017
LMS Amesim / STAR-CCM+
co-simulation: Thermal
analysis of a combustion
chamber
Realize innovation. Unrestricted © Siemens AG 2016
LMS Imagine.Lab Amesim™
A world leading platform for physical
simulation of mechatronic systems
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September 06, 2016 Page 2 Siemens PLM Software
Table of contents
• Introduction to the product portfolio
• Motivation for this co-simulation study
• Setup the 1D LMS Amesim model
• Setup 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 the 1D LMS Amesim model
• Setup the 3D STAR-CCM+ model
• Results of the LMS Amesim / STAR-CCM+ co-simulation
• Going further
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Presentation of the thermal combustion chamber
• This study demonstrates the LMS Amesim / STAR-
CCM+ co-simulation ability to solve dynamic
complex thermal problems with 1D detailed IC
Engine models for combustion.
• It is focused on the combustion chamber of a diesel
engine. It is built from an existing CAD.
• The aim is to refine the thermal behavior of an
operating combustion chamber in a multi-physics
simulation of a engine.
Different parts of the chamber
STAR-CCM+ has a dedicated user interface to connect to LMS Imagine.Lab Amesim
that makes the co-simulation process easy to set-up.
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Table of contents
• Introduction to the product portfolio
• Motivations for this co-simulation study
• Setup the 1D LMS Amesim model
• Setup 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 IC Engine
Based on a Diesel engine template
• Behavior of a single cylinder Diesel Engine:
• LMS Amesim submodels from IFP-Engine library
• The combustion chamber receives as inputs the
temperatures of the liner, piston and top of the
chamber from STAR-CCM+.
Setup of the co-simulation
• Instead of using constant temperatures as
boundary conditions, realistic values can be used:
• These temperatures are computed by STAR-
CCM+
• LMS Amesim evaluates the displacement of the
piston and the heat flow rates between the
components of the chamber and the gas
LMS Amesim model
LMS Amesim
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LMS Amesim results
• LMS Amesim computes the physical phenomena
in the chamber
Combustion is handled by the engine characteristics
The gas-walls thermal exchanges are evaluated
Characteristic values in the chamber during the combustion
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Table of contents
• Introduction to the product portfolio
• Motivations for this co-simulation study
• Setup the 1D LMS Amesim model
• Setup the 3D STAR-CCM+ model
• Results of the LMS Amesim / STAR-CCM+ co-simulation
• Going further
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September 06, 2016 Page 12 Siemens PLM Software
3D STAR-CCM+ model of the liner, piston and top of the chamber
This model is based on an existing CAD assembly with 3 parts.
The fluid is not modeled in STAR-CCM+, which computes only the thermal
effects in the cylinder.
Numerical model
• 3D solid domain, implicit unsteady
• Segregated solid energy
Boundary conditions
• The system is considered to be cooled to a constant temperature of 90 °C,
assuming a lubrication and cooling system
• Heat transfers (computed by LMS Amesim) and temperatures (computed
by STAR-CCM+) are exchanged with the combustion chamber in LMS
Amesim
Combustion chamber
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Liner division
STAR-CCM+ model
Meshing
• Piston and top
• Automatic 3D polyhedral mesh
• Liner
• Direct mesh based on a 2D polyhedral mesher
• Divided into 2 regions to model the motion of the chamber
Motion
• The piston has a translation displacement calculated in LMS Amesim
• The geometry of the combustion chamber (between the piston and
the top) is time dependent :
• A morphing mesh of two separated direct meshes is able to model
this motion : the displacement of the moving boundary between the
two meshes is equal to the displacement of the piston computed by
LMS Amesim
Combustion No combustion
Morphing mesh
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Table of contents
• Introduction to the product portfolio
• Motivation for this co-simulation study
• Setup the 1D LMS Amesim model
• Setup the 3D STAR-CCM+ model
• Results of the LMS Amesim / STAR-CCM+ co-simulation
• Going further
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All the results can be displayed in STAR-CCM+.
Results of the co-simulation
The following graph represents the averaged value of
the temperature on the walls of the combustion
chamber.
Energy is brought by combustion.
Temperatures of the piston and the top Temperatures of the faces of the chamber
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Animation of the LMS Amesim / STAR-CCM+ results with morphing mesh
Animation of the system – Temperature
This video shows the temperature evolution in time while the piston moves.
• Piston displacement is computed by LMS Amesim
• Morphing mesh is used in STAR-CCM+ when the piston moves
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Table of contents
• Introduction to the product portfolio
• Motivation for this co-simulation study
• Setup the 1D LMS Amesim model
• Setup the 3D STAR-CCM+ model
• Results of the LMS Amesim / STAR-CCM+ co-simulation
• Going further
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September 06, 2016 Page 18 Siemens PLM Software
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 Analytics System 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
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