bdmfunction.form

来自「finite element library for mathematic ma」· FORM 代码 · 共 20 行

# Copyright (C) 2006-2007 Anders Logg ([e-mail]) and Marie Rognes ([e-mail])"
# Licensed under the GNU GPL version 3 or any later version
#
# The bilinear form a(v, u) and linear form L(v) for
# a mixed formulation of Poisson's equation with BDM
# (Brezzi-Douglas-Marini) elements.

# Compile this form with FFC: ffc MixedPoisson.form

q = 1

BDM = FiniteElement("Brezzi-Douglas-Marini", "triangle", q)
DG  = FiniteElement("Discontinuous Lagrange", "triangle", q - 1)
MX = BDM + DG

(tau, w) = TestFunctions(MX)
(g, f) = Functions(MX)

L = (dot(tau, g) + w*f)*dx