rod_3d.py
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	# Copyright (C) 2018 by the RROMPy authors
	#
	# This file is part of RROMPy.
	#
	# RROMPy is free software: you can redistribute it and/or modify
	# it under the terms of the GNU Lesser General Public License as published by
	# the Free Software Foundation, either version 3 of the License, or
	# (at your option) any later version.
	#
	# RROMPy is distributed in the hope that it will be useful,
	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	# GNU Lesser General Public License for more details.
	#
	# You should have received a copy of the GNU Lesser General Public License
	# along with RROMPy. If not, see <http://www.gnu.org/licenses/>.
	#

	import fenics as fen
	from rrompy.hfengines.vector_linear_problem import (
	LinearElasticityProblemEngine)

	def rod3Dsolver():
	mesh = fen.Mesh("./tests/hfengines/rod.xml")
	rho_ = 1e3
	nu = .45
	E = 1e6
	g = 1e3
	solver = LinearElasticityProblemEngine(verbosity = 0)
	solver.V = fen.VectorFunctionSpace(mesh, "P", 1)
	solver.lambda_ = E * nu / (1. + nu) / (1. - 2 * nu)
	solver.mu_ = E / (1. + nu)
	solver.forcingTerm = [fen.Constant((0., - rho_ * g / E, 0.)),
	fen.Constant((0., 0., 0.))]
	solver.DirichletBoundary = lambda x, on_b: on_b and fen.near(x[2], 0.)
	solver.NeumannBoundary = "REST"
	return solver