So... I'm currently needing things like d2xyzdxideta on non-planar (ie slightly twisted) faces of 3d elements (ie a quad4 in 3d that is not perfectly planar). When I call fe::reinit() to get these... I get a warning message like so: "WARNING: Second derivatives are not currently correctly calculated on non-affine elements!"
My question is... is that really true in this case? It seems like for a linear quad4 d2xyzdxideta and it's like should be exactly defined.... even if the element isn't perfectly planar. But I'm sure there might be something I'm not thinking of. If there is some error involved... how much error are we talking about. I mean, will it be manageable as long as the element isn't too distorted (which none of mine will be) or is it instantaneously extremely wrong? Thanks, Derek ------------------------------------------------------------------------------ Learn how Oracle Real Application Clusters (RAC) One Node allows customers to consolidate database storage, standardize their database environment, and, should the need arise, upgrade to a full multi-node Oracle RAC database without downtime or disruption http://p.sf.net/sfu/oracle-sfdevnl _______________________________________________ Libmesh-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/libmesh-devel
