Re: [Libmesh-users] mapping back to reference coordinates

2011-04-15 Thread Boyce Griffith
On 4/15/11 4:49 PM, Roy Stogner wrote: > > On Fri, 15 Apr 2011, Boyce Griffith wrote: > >> On 4/15/11 4:37 PM, Roy Stogner wrote: >>> >>> On Fri, 15 Apr 2011, Boyce Griffith wrote: >>> The only complication is that the coordinate system being used for the mesh is a Lagrangian (material)

Re: [Libmesh-users] mapping back to reference coordinates

2011-04-15 Thread Roy Stogner
On Fri, 15 Apr 2011, Boyce Griffith wrote: > On 4/15/11 4:37 PM, Roy Stogner wrote: >> >> On Fri, 15 Apr 2011, Boyce Griffith wrote: >> >>> The only complication is that the coordinate system being used for the >>> mesh is a Lagrangian (material) coordinate system, and the line is in >>> the cu

Re: [Libmesh-users] mapping back to reference coordinates

2011-04-15 Thread Boyce Griffith
On 4/15/11 4:37 PM, Roy Stogner wrote: > > On Fri, 15 Apr 2011, Boyce Griffith wrote: > >> The only complication is that the coordinate system being used for the >> mesh is a Lagrangian (material) coordinate system, and the line is in >> the current (physical) coordinate system, but I suppose tha

Re: [Libmesh-users] mapping back to reference coordinates

2011-04-15 Thread Roy Stogner
On Fri, 15 Apr 2011, Boyce Griffith wrote: > The only complication is that the coordinate system being used for the mesh > is a Lagrangian (material) coordinate system, and the line is in the current > (physical) coordinate system, but I suppose that I can call > Elem::build_side() and then re

Re: [Libmesh-users] mapping back to reference coordinates

2011-04-15 Thread Boyce Griffith
On 4/15/11 4:06 PM, Roy Stogner wrote: > > On Fri, 15 Apr 2011, Boyce Griffith wrote: > >> The reason I ask is that I have a variable, say x(X), restricted to a >> particular side of a particular element for which I would like to >> identify any positions at which x(X0) = x0. If any such position

Re: [Libmesh-users] mapping back to reference coordinates

2011-04-15 Thread Kirk, Benjamin (JSC-EG311)
On 4/15/11 3:02 PM, "Boyce Griffith" wrote: > Also, I realize this probably seems like kind of a bizarre thing to be > computing, but does there happen to be any existing code in libMesh that > could be adapted to do this kind of thing? :-) The implementation for the System::point_value() might

Re: [Libmesh-users] mapping back to reference coordinates

2011-04-15 Thread Roy Stogner
On Fri, 15 Apr 2011, Boyce Griffith wrote: > Is there a function that gives the reference coordinates for each node > of a (Lagrange) element? The first thing that comes to mind: initialize a first-order monomial FE on the element with trapezoidal quadrature, then at point p evaluate xi/eta/zet

Re: [Libmesh-users] mapping back to reference coordinates

2011-04-15 Thread John Peterson
On Fri, Apr 15, 2011 at 2:02 PM, Boyce Griffith wrote: > Hi, Folks -- > > Is there a function that gives the reference coordinates for each node > of a (Lagrange) element? > > The reason I ask is that I have a variable, say x(X), restricted to a > particular side of a particular element for which

[Libmesh-users] mapping back to reference coordinates

2011-04-15 Thread Boyce Griffith
Hi, Folks -- Is there a function that gives the reference coordinates for each node of a (Lagrange) element? The reason I ask is that I have a variable, say x(X), restricted to a particular side of a particular element for which I would like to identify any positions at which x(X0) = x0. If a