COLLATERAL EVENTS

Particleworks European Users' Meeting

Tuesday 29 October 2019   9:15 - 12:30   User Meeting | Language: English

The first European User’s Meeting for Particleworks taking place on the second day of the International CAE Conference and Exhibition.

Reduction of costs and development time, improvement of performances are some of the benefits of using particle-based CFD.

The speakers will cover different industrial applications from the thermal management of e-drives and engines to the lubrication of bearings and gears of transmission systems for automotive, industrial and motorsport applications.

Target Audience: Engineers, managers interested in understanding how simulation can reduce development time and costs and, at the same time, improve the quality and performances of their products.

AGENDA

Riccardo Bergamin, ZECO
Michele Merelli, EnginSoft

Comparison between CFD and MPS Methods for Numerical Simulation of Pelton turbine

Abstract
CFD modelling and validation of Pelton turbines are challenging due to the transient and multi-phase nature of the flow, that require fine and high quality grid definition, in order to accurately capture the flow features.
Due to high computational time, modern CFD techniques allow to study and optimize the components of the turbine like single bucket, needle and nozzle, deviator and manifold.
Finite Volume CFD codes can be used for this kind of component simulations, but models become too complex and computationally expensive when the whole turbine and the open air casing are included in order to study jets interactions and water outflow.
Using particle-based Navier-Stokes solvers, like Particleworks and the Moving Particle Simulation method, these barriers can be overcome, with a technological breakthrough that paves the way to new study and optimization opportunities.
In this paper both Finite Volume simulations of turbine components and Moving Particle Simulation of a complete runner will be presented and comparisons with expected turbine efficiency will be shown.

Nicola Pretto, MarelliMotori

Oil lubricated bearing support analysis on electric generators with mesh-less CFD methods

Abstract
In multibody complex dynamic systems it is often difficult to predict oil flow path and sometimes even impossible to simulate it with traditional CFD software.
This is a very important issue in the energy industry business, that is why Marelli Motori, a designer and manufacturer of electrical motors and generators since 1891, has tested Particleworks, an innovative mesh-less software based on the moving Particle Simulation (MPS Method).
This paper analyses the oil lubricated bearing support on electric generators: using this software our engineers are able to simulate the oil flow path inside the machine and model large-scale equipment behaviour before a new product is put into production, increasing its efficiency and avoiding possible critical issues at a later stage.

Oscar Cuevas, GIMA Transmission Technology

Gear oil jet lubrication efficiency

Abstract
In off-road and in-road vehicles, new developments look forward to improve the efficiency in order to reduce the CO2 emissions. About half of the total losses come from constant losses in the whole driveline. By reducing the gear churning losses, important savings can be made by reducing oil level but for that we need to lubricate gears by oil jet. The difficulty is to determine what are the oil flow and oil jet location to lubricate and cool gear correctly according gear speed/power and design (macrogeometry). The target is to design the lubrication pipes with the lowest cost impact with good lubrication oil flow efficiency. We have analyzed one gear train in different conditions with Particlesworks to establish a rule which gives lubrication oil flow efficiency. That allows to compare oil pipes design and inlet oil flow to take decision for cost effective solution.

Francesco Canestri, Dana Motion Systems
G. Parma, EnginSoft SpA
A. Lucchi, Dana Motion Systems
M. Galbiati, EnginSoft SpA

Churning Losses Evaluation in Swashplate Axial Piston Pump using Moving Particle Approach

Abstract
In axial piston units, churning losses have a non-negligible influence on mechanical efficiency. This work presents a numerical approach for the evaluation of the churning losses in a swashplate axial piston pump for closed circuit applications using the MPS (Moving Particle Semi-implicit) software Particleworks.
Taking advantages of experimental activities and theoretical results derived by different authors [1,2,3], a sensitivity analysis is carried out in order to evaluate the influence of the numerical parameters involved in the simulation. In particular, the effects of the particle size, the slip factor applied to the wall boundaries and the turbulence model are analyzed.
In this framework, reduction of particle size clearly shows the convergence of the churning losses toward the expected value.
The paper also demonstrates that when the reduction of particle size is not affordable due to computational time and resources, the same torque results can be obtained with a coarser particle size, by increasing the slip factor, that affects the viscous forces on the walls.
The use of the turbulence model has instead a lower impact on the churning losses prediction with respect to particle size and slip factor.

Sunao Tokura, Prometech Software

Recent Progress in Application Technique of Moving Particle Method

Abstract
In recent years, applications of numerical simulation based on particle methods on the engineering problems, which are difficult to treat by means of conventional mesh-based CFD software, have been attempted and significant achievements can be obtained. The advantages of the particle methods are that it is easy to handle flow with complex free surfaces and moving boundary conditions which are typically seen in the problems including gears, pistons, and stirring blades. As such particle methods, SPH, MPS and other various methods have been proposed. However, regarding the application of particle methods and similar methods to the design and development of real industrial products, computational efficiency using large-scale model without degradation of accuracy is strongly required. Therefore, it is considered that MPS is suitable for application in such product development processes, since it shows remarkable computational efficiency. In addition, there is always requirement for the capabilities of the solver with high reliability, accuracy and efficiency in computation, as well as easy-to-use user interface settings to prepare and execute analysis tasks more simply and efficiently. In this presentation, the latest capabilities implemented in the CFD software Particleworks based on MPS method, are introduced and discussed.

This event is organized by