lms imagine.lab amesim / star-ccm+ co-simulation - thermal analysis of a combustion chamber

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

Unrestricted © Siemens AG 2016

September 06, 2016 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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Table of contents


• Motivations for this co-simulation study




• Going further



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.



Table of contents






• Going further



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



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



Table of contents






• Going further



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



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



Table of contents






• Going further



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



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



Table of contents






• Going further



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



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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