From: Kirk, Benjamin (JSCEG311) <benjamin.kirk1@na...>  20100216 21:09:05

You can infer this from the 2d numbering. For example, for the HEX8, the base is oriented wrt (xi,eta) according to the QUAD4, and zeta is the vertical direction. On 2/16/10 3:04 PM, "Roy Stogner" <roystgnr@...> wrote: > > > On Tue, 16 Feb 2010, Rahul Sampath wrote: > >> HEX8: 7 6 >> oo >> /: / >> / : /  >> 4 / : 5 /  >> oo  >>  o.......o 2 >>  .3  / >>  .  / >> . / >> oo >> 0 1 >> >> TET4: >> 3 >> o >> /\ >> /  \ >> /  \ >> 0 o......o 2 >> \  / >> \  / >> \/ >> o >> 1 >> >> However, you have not shown the coordinate axes. I need to know the >> following: >> 1) The relationship between the local coordinate system and the local >> node numbering scheme. For example, In Hex8 whether the edge 01 is >> parallel to the local xi or eta axes. >> >> 2) The relationship between the physical global coordinate system and >> the local coordinate system. >> >> I believe you must already be using some convention for both to be >> able to compute the Jacobian of the transformation. It would be very >> helpful if you could tell me where I can find this information. > > To the best of my recollection: > > For triangles and tets, the nodes are at (0,0,0), (1,0,0), (0,1,0), > (0,0,1) in master coordinates > > For tensor product elements, the geometry is [1,1]^d and the edges > are 01:xi, 03:eta, 04:zeta > > For pyramids, the peak is at (0,0,1) and the base is the same as a > quad. > > Prisms are the tensor product of a triangle and an edge, with the > triangle at zeta=1 given the lower local node numbers. > > I'm afraid that the only place where you can find this information > solidly may be implicitly in the fe_lagrange*.C code, though; I'm not > sure we've got it cleanly documented. If you'd like to add such > documentation, a patch (in ASCII so we can put it in the headers) > would be appreciated. >  > Roy > >  > SOLARIS 10 is the OS for Data Centers  provides features such as DTrace, > Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW > http://p.sf.net/sfu/solarisdev2dev > _______________________________________________ > Libmeshusers mailing list > Libmeshusers@... > https://lists.sourceforge.net/lists/listinfo/libmeshusers 