scholarly journals Global-local optimization for parameter structure identification in three-dimensional groundwater modeling

2003 ◽  
Vol 39 (2) ◽  
Author(s):  
Frank T.-C. Tsai ◽  
Ne-Zheng Sun ◽  
William W.-G. Yeh
Keyword(s):  
Groundwater Modeling ◽  
Three Dimensional ◽  
Local Optimization ◽  
Structure Identification

scholarly journals Three-dimensional hydraulic conductivity upscaling in groundwater modeling

2010 ◽  
Vol 36 (10) ◽  
pp. 1224-1235 ◽  
Author(s):  
Haiyan Zhou ◽  
Liangping Li ◽  
J. Jaime Gómez-Hernández
Keyword(s):  
Hydraulic Conductivity ◽  
Groundwater Modeling ◽  
Three Dimensional

Three Dimensional Dynamic Monitoring Model of Groundwater Resources in Jiao Nan Feng He River Basin

2013 ◽  
Vol 664 ◽  
pp. 211-214
Author(s):  
Dao Lei Xie ◽  
Jiu Chuan Wei ◽  
Hui Yong Yin ◽  
Jian Bin Guo ◽  
Ming Xiang He ◽  
...  
Keyword(s):  
River Basin ◽  
Groundwater Level ◽  
Groundwater Modeling ◽  
Groundwater Resources ◽  
Three Dimensional ◽  
Dynamic Monitoring ◽  
Water Model ◽  
Dimensional Structure ◽  
Topographic Map ◽  
Three Dimensional Model

Build strata three-dimensional structure model By GMS (Groundwater Modeling System) software about the Feng He River basin and on the basis of it place the groundwater water model to better show the groundwater level, buried depth, thickness, etc., at the same time display the locations of groundwater cordon. Groundwater cordon can be cut along with the strata and water and displayed on the cutting profile. Superimpose the model and satellite topographic map, so can select a specific position cutting three-dimensional model in order to understand a specific location or area of underground water level, water thickness, etc. Through the real-time update of groundwater level data to understand the utilization of groundwater mining in the study area, ensure the sustainable use of groundwater resources and realization of three dimensional dynamic monitoring of groundwater resources in the study area.

Tomographic PIV in the Near Field of a Swirl-Stabilised Fuel Injector

2018 ◽  
Author(s):  
Adrian Spencer ◽  
Mark Brend ◽  
Daniel Butcher ◽  
David Dunham ◽  
Liangta Cheng ◽  
...  
Keyword(s):  
Near Field ◽  
Measurement Techniques ◽  
Three Dimensional ◽  
Isothermal Flow ◽  
Structure Identification ◽  
Experimental Investigations ◽  
Fuel Injector ◽  
Flow Topology ◽  
Tomographic Piv ◽  
Velocity Statistics

The isothermal flow fields of injectors have undergone several computational and experimental investigations using point and planar measurement techniques,. Within the swirl induced vortex breakdown region it is only LES that has been able to predict fully the presence of a three dimensional helical vortex structure for a particular injector, and in certain conditions (no central fuel jet), a precessing vortex core. These structures can be elucidated from point and planar measurements and favorable comparisons of velocity statistics between experiment and LES predictions strengthen these findings. However, volumetric, 3-component measurement of velocity data has not been widely available to provide conclusive evidence of the exact three dimensional nature of the vortex structures that exist. An experimental setup utilizing time resolved tomographic PIV on a water flow rig is described in this paper. This is used to provide as high-quality aerodynamic study as possible of a single stream radially-fed air swirl gaseous fuel injector. The level of accuracy of the tomographic PIV technique is demonstrated by calculating the divergence of the velocity field as well as validating the results against a comprehensive 2 and 3 component standard PIV velocity database and other measurement techniques and predictions. Structure identification methods have been employed to visualise and understand the complex flow topology within the near field of the injector. The change in topology with and without the stabilising central jet is further investigated and agrees with findings of planar PIV results. While the velocity error associated with the tomo-PIV results is higher than the planar results the data agree well within the identified uncertainty bounds and are complimentary in understanding the flow field structure. Thus a full volumetric aerodynamic survey is available for the first time on this isothermal flow case.

Three-Dimensional Structure of Separated and Vortical Flow in a Half-Ducted Propeller Fan

2007 ◽  
Author(s):  
J. H. Jeong ◽  
K. Takahashi ◽  
K. Iwakiri ◽  
M. Furukawa
Keyword(s):  
Flow Field ◽  
Three Dimensional ◽  
Flow Simulation ◽  
Vortical Flow ◽  
Dimensional Structure ◽  
Structure Identification ◽  
Tip Leakage Vortex ◽  
Three Dimensional Structure ◽  
Tip Leakage ◽  
Ducted Propeller

Three-dimensional structure of separated and vortical flow field has been investigated by numerical analysis on a half-ducted propeller fan. Complicated flow phenomena in the fan were captured by the Reynolds-averaged Navier-Stokes flow simulation (RANS) and a vortex structure identification technique based on the critical point theory. The flow field around the fan rotor is dominated by the tip leakage vortex. The tip leakage vortex starts to be formed near the blade mid-chord and grows nearly in the tangential direction without vortex breakdown. In the rotor passage, the high vorticity flow around the tip leakage vortex core is impinging on the pressure surface of the adjacent blade. It is expected that the behavior of the tip leakage vortex plays a major role in characteristics of the fan noise.

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