Development of smoothed particle hydrodynamics method for analysis of high-speed two-phase flows in hydropower spillways

2017 ◽  
Author(s):  
Akihiko Nakayama ◽  
Lap Yan Leong ◽  
Wei Song Kong
Keyword(s):  
Smoothed Particle Hydrodynamics ◽  
High Speed ◽  
Two Phase Flows ◽  
Two Phase ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Smoothed Particle Hydrodynamics Method

scholarly journals Simulations of intermittent two-phase flows in pipes using smoothed particle hydrodynamics

2018 ◽  
Vol 177 ◽  
pp. 101-122 ◽  
Author(s):  
Thomas Douillet-Grellier ◽  
Florian De Vuyst ◽  
Henri Calandra ◽  
Philippe Ricoux
Keyword(s):  
Smoothed Particle Hydrodynamics ◽  
Two Phase Flows ◽  
Two Phase ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

Numerical modelling of oil distribution and churning gear power losses of gearboxes by smoothed particle hydrodynamics

2018 ◽  
Vol 233 (1) ◽  
pp. 74-86 ◽  
Author(s):  
Hua Liu ◽  
Ghaith Arfaoui ◽  
Milos Stanic ◽  
Laurent Montigny ◽  
Thomas Jurkschat ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Smoothed Particle Hydrodynamics ◽  
High Speed ◽  
Operational Reliability ◽  
Power Losses ◽  
Oil Distribution ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Smoothed Particle Hydrodynamics Method

Sufficient oil supply of all machine elements in gearboxes is usually required to avoid damage during operation. Quite frequently, transmissions are conservatively designed with an oversupply of oil to guarantee operational reliability. An oversupply of oil results in an unnecessarily high amount of oil being kept in motion, which in turn leads to excessive hydraulic gear power losses. In high-speed gearboxes in particular, churning losses can contribute greatly to the total power losses. Further detailed information on the oil distribution in gearboxes is needed in order to increase the efficiency and operational reliability of gearboxes. Computational Fluid Dynamics methods provide a flexible way of investigating oil behaviour in transmissions with almost no restrictions regarding geometry and operating conditions. Generally, there are two main methods of computational fluid dynamics simulation in gearboxes: the traditional finite-volume based method (Eulerian approach) and the mesh-free particle-based method (Lagrangian approach). In this work, a computational fluid dynamics model based on the particle-based smoothed particle hydrodynamics method is built to investigate the oil distribution and churning losses of a dip-lubricated single stage gearbox on an efficiency gear test rig. Results are shown and discussed for different rotational speeds and oil temperatures. The smoothed particle hydrodynamics method provides a high potential of predicting the oil distribution of modern dip-lubricated transmission systems. Comparisons with high-speed camera recordings show good agreement. However, the method shows a need for improvement in churning loss prediction.

Numerical Simulation of Severe Plastic Deformation of Titanium Specimens under Dynamic Channel Pressing

2014 ◽  
Vol 1040 ◽  
pp. 107-112 ◽  
Author(s):  
Vladimir A. Krasnoveikin ◽  
Vladimir Skripnyak ◽  
Alexander A. Kozulin ◽  
Olga Senatova
Keyword(s):  
Numerical Simulation ◽  
Smoothed Particle Hydrodynamics ◽  
High Speed ◽  
Angular Pressing ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Smoothed Particle Hydrodynamics Method ◽  
Deformation Processes ◽  
Dynamic Channel ◽  
Dynamic Pressing

Deformation processes of the α-titanium specimens moving through the channels of the die for two loading schemes: equal channel angular pressing (ECAP) and channel pressing through the channel of variable form (CVF) are investigated. Schemes of dynamic pressing in case the block is extruded at high speed through the channel of the die due to the pressure of the punch or the pressure of powder gases were analyzed. The problem is solved by the smoothed particle hydrodynamics method (SPH) within the framework of elastoplastic continuum.

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