University of Warmia and Mazury in Olsztyn (Poland), 2013. Modification of the PathFinder algorithm for calculating granular beds with various particle size distributions. Sobieski W., Lipiński S., Dudda W., Trykozko A., Marek M., Wiącek J., Matyka M., Gołembiewski J.:ĭepartment of Mechanics and Machine Design, Olsztyn 2016.Sobieski W., Matyka M., Gołembiewski J., Lipiński S.: The Path Tracking Method as an alternative for tortuosity determination in granular beds.Sobieski W., Lipiński S.: The influence of particle size distribution on parameters characterizing the spatial structure of porous beds.program for sensitivity analysis of Kozeny-Carman and Ergun models.program calculating values of Ergun equation for air flow.program calculating values of Kozeny-Carman equation for air flow.program converting YADE output files to PathFinder input files.program converting PFC3D output files to PathFinder input files.pathGUI - graphical interface (currently for Windows only).Installation package contains also User's Guide as well as a few supporting tools: visualization of the tortuosity distribution in characteristic bed points.visualization of the spatial step changes in path points on Z directions.visualization of the deviation (distance) of path points from the plumb-line.calculation of the deviation (distance) of path points from the plumb-line.calculation of the linear and nonlinear terms of Ergun equation.calculation of the linear term of Kozeny-Carman equation (with a model constant equal to 1).calculation of tortuosity using the Yu-Li formula.computing total perimeter, wet perimeter and friction perimeter for each triangle. computing total area and wet area for each triangle.calculation of angles between successive segments of path and average angle.calculation of number of points and sections of path.calculation of path length using smoothing algorithm (for fluid can not change the direction of movement suddenly), in five characteristic locations of bed.calculation of path length (a path that fluid will travel between particles, moving in flow direction - the Z-axis), in the five characteristic locations of bed.determination of default starting coordinates for the so-called nine-point method.calculation of the specific surface area as defined by Kozeny and Carman.calculation of total outer surface of bed particles.calculation of bed height (with a correction of its upper surface).Path Tracking Method - short presentation PathFinder IV.3 – source code with examples The authors also assure that they have made every effort to make the project error-free and containing reliable information. The authors of the project are not responsible for any damage or losses resulting from the use of software and the use of the information contained therein.Copyright holders of each component of the project are indicated in the headers of the source code or in the documentation.In case of redistribution of the software, no part of the installation package can be removed, in particular the terms of the license.In case of publishing any material, for creation of which contributed the elements of the PathFinder project, in particular scientific articles, their authors are required to cite suitable articles from publication lists placed on the project website.The software is free of charge and can be used for any purpose by institutions and individuals.Licence: The conditions for using each of elements of the PathFinder project are as follows: In 2009, the first working version of the program was created the process of its creation was described in the Research Report 1/2009 ( in Polish or in English) This report later became the basis for several articles in peer-reviewed journals. The inspiration to start work on a method was observation, resulting from the author's extensive experience in programming, that DEM simulation results can be used to analyze the internal structure of porous media, in particular for the calculation of various geometrical parameters, including tortuosity. Wojciech Sobieski developed PTM for granular beds in 2009 during an internship at the University of Manitoba in Winnipeg ( see the official confirmation).
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