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The latest enhancements to MacroPac - version 7.1
The latest release (version 7.1, April 2010) of MacroPac has the following enhancements:
The grid resolution used to create the array of grid points (voxels) for the Diffusion Module can be adjusted
A new "Conductor-Conductor" option has been added, where the diffusion ratio of the Matrix/Object can be adjusted.
Restrictions can be placed on the simulation, so that it starts from a surface plane, or within a restricted boundary range - allowing the top and bottom of the container to be excluded from the simulation.
The report now Relative Diffusion Coefficients, which unlike the Effective Diffusion Coefficients are not grid resolution dependent - and so are easier to interpret.
A new Concentration Profile 3D plot option is available, where when the number of simulations run is high the concentration of particles which have moved a given
distance from their starting positions is displayed against the number of steps, which is proportional to time.
More flexibility for pore size and pore percolation analyses
Both Pore Size Analysis and Pore Percolation Analysis can now be carried out within a restricted part of the container.
For Pore Size Analysis the Surface cut defines the top of the surface, so only the Bottom boundary is defined.
For Pore Percolation Analysis the restrictions provide an alternative to excluding the largest pores from the calculations.
More versatile output of object positions
The list of objects can now be output with Fixed Frame angles (Rx, Ry and Rz) as well as the original Euler Angles used in MacroPac.
You can display the object list in a spreadsheet or save the list to file.
The default parameters describing the way shapes are built have been changed, so that the shapes are more accurate. "Capping" with smaller spheres has been altered, to improve the sharpness of the plate edges/corners.
Volume correction has been modified. The "actual" volume is now calculated from the sum of component region (core, corners, edges and faces)
contributions. This method generates better results than the previous methods.
And, following customer requests, discs, whose length is less than their diameter, can now be built.
More versatility for "lifts and drops"
Various changes have been made to the 'settle' algorithm, but one of the most useful is that you can now decide to lift the objects by a defined distance, maintaining their relative positions. This is an alternative to the 'full lift' and 'proportional lift' previously available.
Improvements to Monte Carlo efficiency
Changes to the step size parameters, and separating translation and rotation of non-spherical objects, have been implemented. These changes combine to in general result in higher packing fractions for the same number of steps compared to previous versions of MacroPac.
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