Inlet Velocity Boundry condition

rohangulavani · June 29, 2010, 23:50

Hello everybody,
I am doing one turbulent flow simulation in fluent. But I could not understand how to decide value of K and epsilon, or "intensity and length scale", or "viscosty ratio"???

mamad60 · June 30, 2010, 02:26

IF you know Turbulent intensity at Inlet you can choose intensity and hydraulic diameter .it's the best choise
else leave the default values unchanged

bob12 · June 30, 2010, 03:10

for idraulic diameter you consider this equation

De = 4 A / P

where A is area and P is perimeter; in effect if you have a cylinder the hydraulic diameter is equal to diameter of cylinder

June 29, 2010, 23:50	Inlet Velocity Boundry condition	#1
rohangulavani New Member Rohan Join Date: Jun 2010 Posts: 7 Rep Power: 15	Hello everybody, I am doing one turbulent flow simulation in fluent. But I could not understand how to decide value of K and epsilon, or "intensity and length scale", or "viscosty ratio"???

June 30, 2010, 02:26	Re	#2
mamad60 New Member Mohammd Aghakhani Join Date: May 2009 Posts: 18 Rep Power: 16	IF you know Turbulent intensity at Inlet you can choose intensity and hydraulic diameter .it's the best choise else leave the default values unchanged

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June 30, 2010, 03:10		#3
bob12 Member Join Date: Oct 2009 Location: Italy Posts: 88 Rep Power: 16	for idraulic diameter you consider this equation De = 4 A / P where A is area and P is perimeter; in effect if you have a cylinder the hydraulic diameter is equal to diameter of cylinder