lms imagine.lab amesim / star-ccm+ co-simulation: solid stress analysis of a gerotor pump

LMS Amesim / STAR-CCM+

co-simulation: solid stress

analysis of a gerotor pump

Realize innovation.Unrestricted © Siemens AG 2017

LMS Imagine.Lab Amesim™

A world leading platform for physical

simulation of mechatronic systems

Unrestricted © Siemens AG 2016

2017-01-18 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



Simcenter™ Portfolio for Predictive Engineering Analytics

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LMS

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Synthesis



STAR-CCM+


STAR-CCM+



Cloud

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Controls

1D

3D

TEST

CFD



Table of contents


• Motivations for this co-simulation study




• Going further



Presentation of the gerotor pump

• This gerotor pump has 5 internal cells.

• Plate profiles define the inlet and outlet areas to connect to the

suction and delivery ports.

• Designer’s experience and experimental measurements on test

benches are key factors for the successful design of such a type

of pump.

• Tolerance combinations impact the instantaneous flow rate and

associated pressure ripples.

• The mechanical parts directly suffer these variations of pressure,

which has a consequence on their sustainability.

Rotors in the gerotor pump



• It’s difficult to measure all variables and most influent parameters to understand the

design sensitivities.

• The historical approach with the trial and error process is expensive and takes time so

it’s no longer compatible with current-day projects, which tend towards a shorter

delivery timeline.

• In some cases, optimal design may involve many real-life iterations until you’ll get the

optimal sets of parameters that are all combined together with cross-influences.

• This study demonstrates the LMS Amesim / STAR-CCM+ co-simulation’s ability to solve

coupled solid mechanical problems with 1D detailed pump models for hydraulics.

• It is focused on the internal/external rotors of a gerotor pump.

• It is built from an existing CAD.

Motivations to go for co-simulation

Pain points

Deliveries



Co-simulation of mechanical and hydraulic parts

Rotors in the gerotor pump

A new approach to simulate both

the fluid and the mechanical parts of

the Gerotor pump is required

LMS Amesim

Co-simulation brings an alternative to the usual

limitations and offers further new possibilities to

investigate

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 gerotor pump

Added-value when co-simulation is used

• Realistic boundary conditions

• Dynamic simulation

• Multi-physics model

Setup of the co-simulation

• The pressure at the inlet and the outlet of the pump

is calculated by LMS Amesim

• Their values are sent to STAR-CCM+ via a TCP/IP

communication

• The behavior of each cell is computed in a

supercomponent

LMS Amesim model

LMS Amesim



LMS Amesim results

• There is a 72° phase shift between each cell • Their successive positions at the inlet or the outlet

generates fluctuations in the cumulative flow rate

Flow rates in the gerotor pump

Volume of each cell

Characteristics of each cell during a cycle LMS Amesim



Table of contents






• Going further



Setup of the 3D model

Boundary conditions

• Pressures on :

The inlet of the pump (in blue)

The outlet of the pump (in red)

Numerical model

• Implicit unsteady

• 3D solid domain

• Finite element solid stress

• Linear isotropic elastic behavior

Meshing

• Swept quadrilateral mesh

Boundary conditions

Finite element mesh



Table of contents






• Going further



The pressure fluctuations computed within the LMS

Amesim model are applied to the STAR-CCM+

mechanical parts (rotor and stator).

The usual stress, strain and displacement results are

computed within STAR-CCM+.

All the 3D results can be displayed in STAR-CCM+.

All the 1D results can be displayed in LMS Amesim.

Results of the stress analysis



Results of the stress analysis

The distribution of Von Mises Stress underlines the critical mechanical points



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

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: solid stress analysis of a gerotor pump

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