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Author Message   Svitlana Subota (photinka) Member Username: photinka Post Number: 7 Registered: 02-2007 Posted on Thursday, November 19, 2009 - 05:18 am:    I need to solve the problem with a cylindrical particle in a cell. When I make a geometry with a cylinder the program doesn't work with error "incomplete bounding mesh". When I add semisheres in the cylinder butts the program hangs at the stage "adapt curvature". What can be done to solve the problem? twist_t_0_cylinder.pde (1.8 k) twist_t_2_cyl_sph.pde (2.7 k)   Robert G. Nelson (rgnelson) Moderator Username: rgnelson Post Number: 1306 Registered: 06-2003 Posted on Thursday, November 19, 2009 - 04:02 pm:    By limiting the cylindrical surface to the interior of the cylinder, you have created a discontinuity in surfaces 2 and 3. FlexPDE is not able to construct a mesh across a discontinuous surface. All extrusion surfaces must be continuous throughout the structure. One way to solve this is to define the cylinder to go all the way through the figure and break it into three pieces. The two end pieces would be given the material properties of the surrounding box, while the center section would be given the cylinder properties. This results in a 3-region, 3-layer structure. Another straightforward way to do it is to turn the figure ninety degrees and extrude the cylinder upward in Z. This creates a 2-region, 3-layer structure. I don't know what you were trying to do with the extra layers in the capped-cylinder case. It should have worked except for the funny extra layers.