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
2017-01-18Page 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

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 flexibility
Openness &
Scalability
User experience
Industry &
engineering expertise
Systems 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 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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