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<FONT face=Arial>Hello,<BR><BR><SPAN class=300505815-27112009><FONT
color=#0000ff><FONT color=#000000>We are </FONT></FONT></SPAN>trying to
mesh a geometry which mainly consists of a three dimensional rectangular lattice
divided in 14x14x4 (x,y,z)-regions. For this purpose I have used the
extrusion-commands to generate a structured mesh of hexahedron-8 elements. At
the moment i'm trying to replace the 4 center (in x,y-plane) geometrical volumes
by a circular 'beam' (cilinder).<BR><BR>I have added a simplified version
(6x6x1) of the model as an attachment. Here prims are generated in the center
region, but<SPAN class=300505815-27112009> our </SPAN>fem-solving software can't
handle prisms at the moment.<BR><BR>Is i<FONT color=#0000ff><SPAN
class=300505815-27112009><FONT
color=#000000>t</FONT> </SPAN></FONT>possible to generate a mesh for this
geometry which only consists of hexes (necessarily unstructured inside the
center region), <B>without</B> having to refine the mesh outside of the center
area? This is important for the time of computation. (so each side of an element
(in the x,y-plane) has a length equal to that of the side of the smalles
geometrical entity (8 cm in this case)).<BR>So only 8 nodal points (in the
x,y-plane) are available at the boundary of the center region.<BR><BR>Or is
there another nice way to handle this situation and create a conforming mesh? A
rough estimate of the cilinder is already satisfactory in my case.<BR>Or is the
use of prisms the only really usable option?<BR><BR>Greetings and I'm curious to
hear some good ideas,<BR><BR>(I would also like to know how I can prevent the
two errors in the creation of the 1D-mesh due to deleting the original
elementary entities in the center of the geometry. But this is not the most
important problem at the moment.)</FONT></DIV></BODY></HTML>