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