【摘 要】
：
The present paper presents comparisons of the vortex identification between the Omega method and the Q criterion based on the data of a classical flow.From the comparisons of the vortex structure together with the flow statistics,some important conclusion
【机 构】
：
Key Laboratory of Condition Monitoring and Control for Power Plant Equipment(Ministry of Education),
论文部分内容阅读
The present paper presents comparisons of the vortex identification between the Omega method and the Q criterion based on the data of a classical flow.From the comparisons of the vortex structure together with the flow statistics,some important conclusions are drawn on the validity of the two methods,as follows.The Omega method can identify various kinds of vortices with different intensities (e.g.,the strong vortex,the medium vortex and the weak vortex).For the Q criterion,due to the subjective threshold selection,only the strong vortex with weak deformations could be identified.Finally,some emerging topics related with the advanced vortex identification methods are briefly discussed.
其他文献
The cavitation is directly related to the safety of many large water conservancy projects.There are two types of cavitation bubbles,one is generated by the gas nucleus,called the non gas-beating cavitation bubble,and another is generated by the gas bubble
Due to its multiscale and multi-layer natures,the coherent structures of turbulent in the open channel flow is complex and difficult to be visualized for understanding its evolution.In this paper,five types of methods for the vortical structure in the flu
In recent years,artificial neural networks (ANNs) and deep learning have become increasingly popular across a wide range of scientific and technical fields,including fluid mechanics.While it will take time to fully grasp the potentialities as well as the
The supercritical carbon dioxide (SC-CO2) jet has a wide application prospect for rock breaking and jet fracturing in the development of the unconventional shale energy,due to its special physicochemical properties.To investigate its jet flow characterist
A novel air bubble lubrication method using the winged air induction pipe (WAIP) device is used to reduce the frictional drag of the hull of the ship and hence increase the efficiency of the propulsion system. This bubble lubrication technique utilizes th
The turbulent flow in the draft tube of a Francis turbine is very complicated while working under off-design conditions. Althoughthe off-design conditions were widely studied, the vortex core line in the draft tube of a Francis turbine with splitter blade
Experimental studies on the flow pattern and the pressure gradient of gas-liquid co-current two-phase flow in a mini-channel were conducted.The test section was a transparent circular channel of 1.6 mm inner diameter.The working fluids were air and water.
This paper investigates the kinematic optimization of fish-like swimming.First,an experiment was performed to detect the motion of the fish tail foil of a fish robot.Next,the kinematic swimming model was verified experimentally using an image processing m
Most hydrodynamic problems in ship and ocean engineering are complex and highly coupled.Under the trend of intelligent and digital design for ships and ocean engineering structures,comprehensive performance evaluation and optimization are of vital importa
Wash waves produced by ships disintegrate river banks and coastal lines. This phenomenon of bank erosion is mainly due to the height of the waves. Various factors govern the formation of these waves and their amplitudes: the geometry of the water channel,