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boundary_condition.py
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			#!/usr/bin/env python3

			""" boundary_condition.py: User defined boundary condition example"""

			__author__ = "Nicolas Richart"
			__credits__ = [
			"Nicolas Richart <nicolas.richart@epfl.ch>",
			]
			__copyright__ = "Copyright (©) 2018-2021 EPFL (Ecole Polytechnique Fédérale" \
			" de Lausanne) Laboratory (LSMS - Laboratoire de Simulation" \
			" en Mécanique des Solides)"
			__license__ = "LGPLv3"


			import math


			class SinBoundary:

			def __init__(self, amplitude, phase):
			self.amplitude = amplitude
			self.phase = phase

			def compute(self, disp, coord, flags):
			disp[1] = - self.amplitude * math.sin(self.phase * coord[1])
			flags[1] = True