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firedrakeproject / firedrake

Firedrake is an automated system for the portable solution of partial differential equations using the finite element method (FEM)
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Spatial Convergence Order of Unsteady Problems #3625

Open qk11853 opened 2 weeks ago

qk11853 commented 2 weeks ago 
N = N * 2
mesh = UnitSquareMesh(N, N, diagonal="crossed")

# ====================Time===================
dt = 1e-5
num_steps = 10
T = dt * num_steps

I get an error when using finite element method to find the spatial convergence order. I give a very small time step and reduce the spatial step by half each time. Why can't I get the correct convergence order?

connorjward commented 2 weeks ago

Please share a complete (minimal) script that reproduces the error, as well as the error message. The information you have provided isn't enough for us to help you.