Numerical modeling of the power losses in geared transmissions: Windage, churning and cavitation simulations with a new integrated approach that drastically reduces the computational effort

2016 ◽  
Vol 103 ◽  
pp. 58-68 ◽  
Author(s):  
Franco Concli ◽  
Carlo Gorla
Keyword(s):  
Numerical Modeling ◽  
Integrated Approach ◽  
Computational Effort ◽  
Power Losses

scholarly journals A New Integrated Approach for the Prediction of the Load Independent Power Losses of Gears: Development of a Mesh-Handling Algorithm to Reduce the CFD Simulation Time

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
F. Concli ◽  
A. Della Torre ◽  
C. Gorla ◽  
G. Montenegro
Keyword(s):  
Prediction Models ◽  
Cfd Simulation ◽  
Integrated Approach ◽  
Numerical Approach ◽  
Computational Effort ◽  
Power Losses ◽  
Cfd Simulations ◽  
Numerical Calculation Method ◽  
Simulation Time ◽  
Potential Tool

To improve the efficiency of geared transmissions, prediction models are required. Literature provides only simplified models that often do not take into account the influence of many parameters on the power losses. Recently some works based on CFD simulations have been presented. The drawback of this technique is the time demand needed for the computation. In this work a less time-consuming numerical calculation method based on some specific mesh-handling techniques was extensively applied. With this approach the windage phenomena were simulated and compared with experimental data in terms of power loss. The comparison shows the capability of the numerical approach to capture the phenomena that can be observed experimentally. The powerful capabilities of this approach in terms of both prediction accuracy and computational effort efficiency make it a potential tool for an advanced design of gearboxes as well as a powerful tool for further comprehension of the physics behind the gearbox lubrication.

scholarly journals Innovative Strategies for Bearing Lubrication Simulations

2019 ◽  
Author(s):  
Franco Concli ◽  
Christian Thomas Schaefer ◽  
Christof Bohnert
Keyword(s):  
Roller Bearing ◽  
Computational Effort ◽  
Main Concern ◽  
Design Phase ◽  
Efficiency Improvement ◽  
Power Losses ◽  
Innovative Strategies ◽  
Cylindrical Roller Bearing ◽  
Cylindrical Roller ◽  
Good Agreement

Efficiency improvement is the new challenge in all fields of design. In this scenario the reduction of power losses is becoming more and more a main concern also in the design of power transmissions. Appropriate models to predict power losses are therefore from the earliest stages of the design phase. The aim of the project is to carry on lubrication simulations of several variants of a cylindrical-roller-bearing to understand the lubricant distribution and the related churning power losses. Several strategies to reduce the computational effort have been used. Among them the sectorial symmetry and three innovative meshing strategies (purely analytical with and without interfaces and analytical/subtractive) that have been implemented in the OpenFOAM® environment. The results of the different approaches were compared among them and with experimental observations showing good agreement and reasonable savings in terms of computational effort.

scholarly journals Innovative Meshing Strategies for Bearing Lubrication Simulations

Lubricants ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 46 ◽  
Author(s):  
Franco Concli ◽  
Christian Thomas Schaefer ◽  
Christof Bohnert
Keyword(s):  
Roller Bearing ◽  
Computational Effort ◽  
Main Concern ◽  
Design Phase ◽  
Efficiency Improvement ◽  
Power Losses ◽  
Lubricant Distribution ◽  
Cylindrical Roller Bearing ◽  
Cylindrical Roller

Efficiency improvement is the new challenge in all fields of design. In this scenario the reduction of power losses is becoming more and more a main concern also in the design of power transmissions. Appropriate models to predict power losses are therefore required from the earliest stages of the design phase. The aim of this project is to carry out lubrication simulations of several variants of a cylindrical roller bearing to understand the lubricant distribution and the related churning power losses. Several strategies to reduce the computational effort were used. Among them the sectorial symmetry and three innovative meshing strategies (purely analytical with and without interfaces and analytical/subtractive) that were implemented in the OpenFOAM® environment. The results of the different approaches were compared among them and reasonable savings in terms of computational effort were shown.

Numerical modeling of hydrodynamics and sediment transport—an integrated approach

2017 ◽  
Vol 67 (10) ◽  
pp. 1283-1292 ◽  
Author(s):  
Gabriela Gic-Grusza ◽  
Aleksandra Dudkowska
Keyword(s):  
Numerical Modeling ◽  
Sediment Transport ◽  
Integrated Approach
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