On Tue, Jun 25, 2019 at 6:44 AM Ham, David A <david.ham@imperial.ac.uk> wrote:
I **think** that the concept is that the physical cell is mapped to the reference cell, so you are pulling back reference values through that mapping to get physical values.
Ah. I named them the opposite way :) This is a good window into how my mind works. I thought since the Jacobian maps reference to real (and phi for that matter) that the default direction of any mapping should be ref-to-real. It seems like this is the overwhelming convention in large deformations. Thanks, Matt
*From: *<firedrake-bounces@imperial.ac.uk> on behalf of Matthew Knepley < knepley@gmail.com> *Date: *Tuesday, 25 June 2019 at 11:37 *To: *Lawrence Mitchell <wence@gmx.li> *Cc: *firedrake <firedrake@imperial.ac.uk> *Subject: *Re: [firedrake] Error to run a script converted from FEniCS
On Tue, Jun 25, 2019 at 4:52 AM Lawrence Mitchell <wence@gmx.li> wrote:
Dear Simone
On Tue, 25 Jun 2019 at 00:34, Simone Puel <spuel@utexas.edu> wrote:
Hi all,
My name is Simone Puel, a graduate student at the University of Texas at
Austin. I think I have installed Firedrake correctly since I can run the example in the online tutorial. Thank you so much.
I am trying to convert a script I made in FEniCS in Firedrake. I modified some syntax, but I have the following error:
[...]
assert len(gsh) == 1 AssertionError
I made a very simple mesh in Gmsh (attached) and the script is the
linear elasticity using a mixed formulation (Arnold et al., 2007). The problem is a 2D rectangle with a vertical fault where I prescribe 1 m of slip.
I attached the mesh (.msh file) and the script. If anyone is able to help, I would appreciate it. Thank you so much in advance. Have a wonderful day!
This is, I think, I missing feature in the way UFL applies pullback to certain elements. (I'm slightly surprised the fenics version works!).
This is my chance to ask a notational question. I recently put this in PETSc so I could see how everything worked,
and it looks like the operation here is to put tabulated reference values of the basis or test functions into real space
for a cell integral say. Isn't that operation the pushforward (adjoint of pullback). I use the pullback when I am mapping
back user function evals to evaluate the action of dual basis vectors. Am I misunderstanding the terminology?
Thanks,
Matt
In any case, I think I have a fix. Can you try with these changes in UFL:
https://github.com/firedrakeproject/ufl/pull/18
And in Firedrake:
https://github.com/firedrakeproject/firedrake/pull/1466
Thanks,
Lawrence
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