Usefulness of Virtual 3D Modeling to Visualize the Effect of Uncertain Data in Groundwater Solute Transport

2011 ◽  
Author(s):  
Chandramouli Viswanathan ◽  
Chenn Zhou ◽  
John Moreland ◽  
Site Guo
Keyword(s):  
Virtual Reality ◽  
Boundary Conditions ◽  
Solute Transport ◽  
Uncertain Data ◽  
Behavior Changes ◽  
Complex Process ◽  
Time Domains ◽  
Contamination Plume ◽  
System Movement ◽  
Simulation Time

Immersive virtual reality models can be effectively used in understanding the system behavior. It will also help the students to understand the influences of boundary conditions by reflection. In particular, those systems which are not suitable for laboratory experiment can be handled using virtual reality platform. In this research, groundwater solute transport simulation was developed as a laboratory module. Groundwater system movement takes place beneath ground. Recently, several sites were contaminated due to manmade activities. This complex process is very difficult to understand with varying boundary conditions. If there is an uncertainity associated with the modeling parameters, remedial alternatives planned may be not as effective as expected. Behavior changes under these circumstances can be tackled through a sensitivity analysis and incorporated in virtual 3D. In this study, by varying the hydraulic conductivity systematically in different layers, the possible variations in the groundwater contamination plume movements were examined for different simulation time domains with remedial alternatives.

Comparison of Various Pressure Based Boundary Conditions for Three-Dimensional Subsonic DSMC Simulation

2017 ◽  
Vol 140 (3) ◽  
Author(s):  
Niraj Shah ◽  
Abhimanyu Gavasane ◽  
Amit Agrawal ◽  
Upendra Bhandarkar
Keyword(s):  
Boundary Conditions ◽  
Cell Size ◽  
Pressure Ratio ◽  
Three Dimensional ◽  
Direct Simulation Monte Carlo ◽  
Statistical Error ◽  
Nonequilibrium Effect ◽  
Time Required ◽  
Characteristic Scheme ◽  
Simulation Time

Three-dimensional (3D) direct simulation Monte Carlo (DSMC) has been used to simulate flow in a straight microchannel using an in-house parallelized code. In the present work, a comparative study of seven boundary conditions is carried out with respect to time required for achieving steady-state, accuracy in predicting the specified pressure at the boundaries, and the total simulation time required for attaining a statistical error within one percent. The effect of changing the Knudsen number, pressure ratio (PR), and cross aspect ratio (CAR) on these parameters is also studied. The presence of a boundary is seen to affect the simulated pressure in a cell when compared to the specified pressure, the difference being highest for corner cells and least for cells away from walls. All boundary conditions tested work well at the inlet boundary; however, similar results are not obtained at the outlet boundary. For the same cell size, the schemes that employ first- and second-order corrections lead to a smaller pressure difference compared to schemes applying no corrections. The best predictions can be obtained by using first-order corrections with finer cell size close to the boundary. For most of the simulated cases, the boundary condition employing the characteristic scheme with nonequilibrium effect leads to the minimum simulation time. Considering the nonequilibrium effect, prediction of inlet and outlet pressures and the speed of simulation, the characteristic scheme with nonequilibrium effect performs better than all the other schemes, at least over the range of parameters investigated herein.

scholarly journals Small scale gas turbine combustor sizing

2019 ◽  
Vol 20 (1-2) ◽  
pp. 180-184
Author(s):  
Michal Czarnecki
Keyword(s):  
Boundary Conditions ◽  
Gas Turbine ◽  
Small Scale ◽  
Gas Turbine Combustor ◽  
Full Size ◽  
Micro Scale ◽  
Initial Design ◽  
Numeric Model ◽  
Complex Process ◽  
Prototype Design

Presented article is focused on initial design of small scale combustors for micro scale jest engines. In comparison to the full size equivalent, small combustor are design and manufactured in experimental way. To try building universal numeric model for micro size design is important to acquire as many data as possible to identify boundary conditions for a model. Major advantage of analyzing different design is possibility to quick building prototype design without investigating complex process of combustion.

scholarly journals Virtual Identity

1969 ◽  
Vol 1 (1) ◽  
Author(s):  
Stephanie Yumansky
Keyword(s):  
Virtual Reality ◽  
Second Life ◽  
Virtual World ◽  
Real Life ◽  
Ordinary People ◽  
Online Forums ◽  
Self Presentation ◽  
Virtual Identity ◽  
Complex Process ◽  
Online Identities

This paper will explore the realm of virtual identity within the context of the online virtual world, Second Life. The creation of virtual identities involves the complex process of constructing an online self-presentation. With the prevalence of online forums and virtual reality, ordinary people are crafting identities online and digressing from their actual identities in real life. In order to explain this phenomenon, I draw on narrative theory's conceptualization of character in order to understand how people craft online identities.

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