示例#1
0
	def pressure_difference_to_gravity(self, delta_p, length):
		''' Converts gravity driven force to equivalent pressure difference
		'''
		from md_statistics import MDStatistics
		md_statistics = MDStatistics(self.md, self)
		density = md_statistics.get_density()
		return delta_p / (length*density*self.md.mass)
示例#2
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	def gravity_to_pressure_difference(self, g, length):
		''' Converts gravity driven force to equivalent pressure difference
		'''
		from md_statistics import MDStatistics
		md_statistics = MDStatistics(self.md, self)
		density = md_statistics.get_density()
		return g*density*self.md.mass*length
示例#3
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	def length_from_knudsen_number(self, knudsen_number):
		''' Calculates required density to get a specific Knudsen number through
				Kn=mean_free_path/length
		''' 
		sigma = 1.0 # Diameter
		from md_statistics import MDStatistics
		md_statistics = MDStatistics(self.md, self)
		density = md_statistics.get_density()
		return 1.0/(sqrt(2.0)*pi*sigma**2*knudsen_number*density)