hydraulic diameter in 2d

ahsan · August 28, 2009, 03:44

hi all
i am working on a 2D case of the fluidization of charcoal. In order to specify the turbulance specification at velocity inlet, i have to specify the value of hydraulic diameter. In 3d, inlet is a circular duct. Problem is that how i can define the hydraulic diameter for 2D case at velocity inlet edge.

In the tutorial 01 of fluent6.2, i have found that the wetted perimeter will always be 2 for a circular inlet in 2D case regardless of whatever is inlet diameter. Also the hydraulic dimeter will be 2 times the diameter of the circular inelt.

In some other tutorials, i found that the hydraulic diameter will be double of actual diameter for a 2D case.

plz guide me that how this hydraulic dimeter will be double for a 2D case and how this wetted perimeter is 2.

regards

Ahsan

coglione · August 28, 2009, 04:14

Hello ahsan

to specify turbulence correctly at inlets using intensity and hydraulic diameter you always have take the actual, physical dimensions. If your inlet geometry is a circle then take its diameter, no matter if you are using a 2-D or 3-d model to simulate the problem.

cheers

ahsan · August 28, 2009, 16:22

hi coglione
thanx for guidence

ahsan

August 28, 2009, 03:44	hydraulic diameter in 2d	#1
ahsan New Member ahsan ikram Join Date: Jul 2009 Posts: 13 Rep Power: 17	hi all i am working on a 2D case of the fluidization of charcoal. In order to specify the turbulance specification at velocity inlet, i have to specify the value of hydraulic diameter. In 3d, inlet is a circular duct. Problem is that how i can define the hydraulic diameter for 2D case at velocity inlet edge. In the tutorial 01 of fluent6.2, i have found that the wetted perimeter will always be 2 for a circular inlet in 2D case regardless of whatever is inlet diameter. Also the hydraulic dimeter will be 2 times the diameter of the circular inelt. In some other tutorials, i found that the hydraulic diameter will be double of actual diameter for a 2D case. plz guide me that how this hydraulic dimeter will be double for a 2D case and how this wetted perimeter is 2. regards Ahsan

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August 28, 2009, 04:14		#2
coglione Senior Member Max Join Date: Mar 2009 Posts: 133 Rep Power: 17	Hello ahsan to specify turbulence correctly at inlets using intensity and hydraulic diameter you always have take the actual, physical dimensions. If your inlet geometry is a circle then take its diameter, no matter if you are using a 2-D or 3-d model to simulate the problem. cheers

August 28, 2009, 16:22		#3
ahsan New Member ahsan ikram Join Date: Jul 2009 Posts: 13 Rep Power: 17	hi coglione thanx for guidence ahsan