# deal.ii - ParaView "warp by scalar" of my output is not continuous

During our finite element course, we've solved the linear elasticity problem in 2D on a square (GridGenerator::hyper_cube) with $$Q_1$$ bilinear finite elements in each component. We imposed neumann homogeneous boundary conditions on one face, and homogeneous Dirichlet on the other three faces.

As outputs, we chose:

• magnitude of the solution $$u$$
• $$u_x$$ (x-displacement)
• $$u_y$$ (y-displacement)

The output of the magnitude of $$u$$ is the following: So far so good. Now, I select $$u_x$$, and I'd like to warp it by scalar, as it is a scalar valued function. So first let's see $$u_x$$: Now, I warp this $$u_x$$ by scalar, and the plot is the following: i.e. it seems that the solution is flat, which is absolutely non-sense. Also, if I increase the scale factor, I got something which to me doesn't make any sense at all: Does anyone know if this is normal, or is there something wrong in my finite element solver? If the latter, this would really surprise me

• What is the boundary condition?
– knl
Jun 28 at 18:42
• Neumann homogeneous everywhere, except on the left boundary, where is homogeneous Dirichlet. @knl Jun 28 at 18:44
• $u_x = u_y = 0$ on left? $\sigma(u)n = 0$ on others?
– knl
Jun 28 at 18:56