Numerical Simulation of Wall Pressure during Discharge of Granular Material from Cylindrical Silos with Eccentric Hoppers

2003 ◽  
Vol 85 (1) ◽  
pp. 101-109 ◽  
Author(s):  
M Guaita ◽  
A Couto ◽  
F Ayuga
Keyword(s):  
Numerical Simulation ◽  
Granular Material ◽  
Wall Pressure

Numerical Simulation of Blade Fault Signatures From Unsteady Wall Pressure Signals

1997 ◽  
Vol 119 (2) ◽  
pp. 362-369 ◽  
Author(s):  
V. Dedoussis ◽  
K. Mathioudakis ◽  
K. D. Papailiou
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Gas Turbine ◽  
Wall Pressure ◽  
Operating Point ◽  
Calculation Time ◽  
Rotating Blades ◽  
Time Signals ◽  
Gas Turbine Compressor ◽  
Industrial Gas Turbine

A method for establishing signatures of faults in the rotating blades of a gas turbine compressor is presented. The method employs a panel technique for the calculation of the flow field around blade cascades, with disrupted periodicity, a situation encountered when a blade fault has occurred. From this calculation, time signals of the pressure at a location on the casing wall, facing the rotating blades, are constituted. Processing these signals, in combination with “healthy” pressure signals, allows the constitution of fault signatures. The proposed method employs geometric data, as well as data about the operating point of the engine. It gives the possibility of establishing the fault signatures without the need of performing experiments with implanted faults. The successful application of the method is demonstrated by comparison of signatures obtained by simulation to signatures derived from experiments with implanted blade faults, in an industrial gas turbine.

Numerical Simulation Analysis on Explosion Stress Field of Different Charge Construction

2011 ◽  
Vol 250-253 ◽  
pp. 2612-2616 ◽  
Author(s):  
Qi Zong ◽  
Lu Ping Yan ◽  
Hai Bo Wang
Keyword(s):  
Numerical Simulation ◽  
Stress Field ◽  
Simulation Analysis ◽  
Blast Hole ◽  
Peak Stress ◽  
Wall Pressure ◽  
Energy Utilization ◽  
Good Energy ◽  
Maximum Water ◽  
Simulation Results

There are different blasting stress field which around the blast hole caused by different charge when explosives exploded in the rock. Simulation analysis on borehole wall pressure and explosion stress field of rock at different charging structure was done by ANSYS/LS-DYNA. The simulation results indicate: stress of coupling charge is the maximum, water-decouple charge is the latter and air-decouple charge is the minimum; and whether air-decouple or water-decouple charge, peak stress value of model decreased along with the increasing of decouple coefficient, but the air-decouple charge show more obvious. Therefore, water-decouple blasting has good energy utilization.

scholarly journals Numerical Simulation of the Emergency Brake Process in Granular Material Transportation Using DEM: Effect of the Liquid Bridge

2015 ◽  
Vol 102 ◽  
pp. 1811-1819
Author(s):  
Chunhai Ke ◽  
Hao Zhang ◽  
Xiaoqiang Yue ◽  
Chunsheng Feng ◽  
Shi Shu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Granular Material ◽  
Liquid Bridge ◽  
Material Transportation

Numerical Simulation by DDA and the Fabrics Analysis of Two Dimensional Experiment on Coarse Granular Material

2012 ◽  
Vol 170-173 ◽  
pp. 3621-3629
Author(s):  
Pei Xi Guo ◽  
Shao Zhong Lin
Keyword(s):  
Numerical Simulation ◽  
Laboratory Test ◽  
Granular Material ◽  
Simulation Model ◽  
Mechanical Characteristics ◽  
Discontinuous Deformation Analysis ◽  
Deformation Analysis ◽  
Two Dimensional ◽  
Stress Strain ◽  
Discontinuous Deformation

DDA(Discontinuous Deformation Analysis) was used to study the mechanical characteristics of coarse granular material (CGM). The numerical simulation model was found consulting the two Dimensional test of CGM,and the stress-strain curves obtained by the numerical simulation were basically in agreement with the results of laboratory test. It indicates that the numerical simulation is suitable for the mechanical characteristic research of CGM. In addition,the distribution statistic of several fabric elements about interaction between particles was also presented. Some relation between the stress-strain and fabric element change are found after analysis.

Sign in / Sign up

Export Citation Format

Share Document