I have been attempting to use vmtk to generate meshes for use with fluent. Because the nature of my workflow involves geometric transformations of segmented borders, my starting point is a point set (well, more accurately, several disjoint structured grids). I have a program that generates a topologically sound triangular surface with minimal triangle angle of 24 degrees, flow extensions added, and caps removed at boundaries.
My coordinates are also spaced in meters, so my edge lengths are typically on the order of 0.0002. After a few false starts, I have successfully been able to run vmtkmeshgenerator on the STL file output by my initial triangulation, and pipe it into vmtkmeshwriter to create a fluent file, and use a pipe I wrote myself to identify the inlets based on proximity of the entities to known locations of centerlines at boundaries. The first surface I attempted ran in fluent fine. 2 subsequent, more complex surfaces are causing fluent to fail in mysterious ways that are almost certainly related to mesh quality. I am invoking vmtkmeshgenerator with -edgelength 0.0002 as the only argument. Are there known steps I can take to alleviate this/improve mesh quality? There are clearly a large number of people using vmtk successfully, so I can only assume I could be doing something better. (When I examine the mesh, fluent's quality rating is typically between 10 and 20, with a maximum aspect ratio value of around 35). My current tack is to attempt to add the centerlines into the flow using vmtkdistancetocenterlines, on the assumption that this will cause the sizing function to generate more useful information, and thereby give me better shaped tetrahedra -- but I could use advice, as I do somewhat feel like I'm swinging in the dark. Thanks. --Richard ------------------------------------------------------------------------------ Don't let slow site performance ruin your business. Deploy New Relic APM Deploy New Relic app performance management and know exactly what is happening inside your Ruby, Python, PHP, Java, and .NET app Try New Relic at no cost today and get our sweet Data Nerd shirt too! http://p.sf.net/sfu/newrelic-dev2dev _______________________________________________ vmtk-users mailing list vmtk-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/vmtk-users
