lms imagine.lab amesim / star-ccm+ co-simulation: electric equipment bay of an aircraft

Realize innovation.

LMS Amesim / STAR-CCM+

co-simulation: electric

equipment bay of an aircraftLMS Imagine.Lab Amesim™

A world leading platform for physical

simulation of mechatronic systems

Restricted © Siemens AG 2017


Siemens PLM Software

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



Simcenter™ Portfolio for Predictive Engineering Analytics

LMS Imagine.Lab

LMS Imagine.Lab Amesim

LMS

Imagine.Lab

System

Synthesis



STAR-CCM+


STAR-CCM+



Cloud

Licensing

flexibility


Cornerstones for a future-proof engineering approach

Covering full range of

methods

Analytics, reporting &

exploration

Deployment flexibilityOpenness &

ScalabilityUser experience

Industry &

engineering expertiseSystems approach

Collaboration &

workflow

Multidiscipline

& multiphysics

R

F

L

P

Controls

1D

3D

TEST

CFD



Table of contents


• Motivations for this co-simulation study




• Going further



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



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.



Table of contents






• Going further



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 discretization LMS Amesim representation of the electronic card



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



Table of contents






• Going further



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 enclosureSimplified part of an avionic bay



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



Table of contents






• Going further



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

LMS Amesim



• 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+



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



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



Table of contents






• Going further



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



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



3D SIMULATION

CFD SIMULATION

1D SIMULATION

From disconnected models and data …

Customer Usage data

Simulation data

Test data TEST MODELING

Historical data

CONTROLS



…to a performance Digital Twin

3D SIMULATION

CFD SIMULATION

1D SIMULATION

Customer Usage data

Simulation data

Test data TEST MODELING

Historical data

CONTROLS



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

lms imagine.lab amesim / star-ccm+ co-simulation: electric equipment bay of an aircraft

Technology