boundary condition at outlet for microchannel flow

josephmp · February 5, 2015, 11:49

Hi all, i have just started studying ansys fluent. what i have to find is the pressure drop in a microchannel with a specified velocity inlet and length of pipe. Nothing is known about outlet conditions. the outlet pressure need not be atmospheric. In such a case what should be my outlet boundary condition?

edoan · February 5, 2015, 12:40

you can use pressure outlet condition just set a pressure at the outlet and the inlet with adapt to give you the correct pressure drop.

josephmp · February 6, 2015, 15:27

thank you for answering....but i didnt get the method clearly. what do you mean by adapt? can you plz be a little more elaborate?

edoan · February 6, 2015, 15:39

Lets say the pressure drop in your system should be x Pa. if you set the outlet to y Pa then the inlet pressure will be equal to x+y Pa. do you get my point?

josephmp · February 9, 2015, 01:09

thank you very much....since i m interested only in the pressure drop your advice helped me...but for information may i ask is there any method to input the inlet pressure and find the outlet pressure as a result of it?

edoan · February 9, 2015, 08:10

sorry joseph i haven't done anything like that i am not sure if there is a good way. I am thinking you can switch the position of your pressure outlet and velocity inlet where you specify the velocity at the inlet as negitive so it is essentially an outlet and your pressure "outlet" is your inlet.

February 5, 2015, 11:49	boundary condition at outlet for microchannel flow	#1
josephmp Member joseph Join Date: Jan 2015 Posts: 32 Rep Power: 11	Hi all, i have just started studying ansys fluent. what i have to find is the pressure drop in a microchannel with a specified velocity inlet and length of pipe. Nothing is known about outlet conditions. the outlet pressure need not be atmospheric. In such a case what should be my outlet boundary condition?

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February 5, 2015, 12:40		#2
edoan Member Ethan Doan Join Date: Oct 2012 Location: Canada Posts: 90 Rep Power: 13	you can use pressure outlet condition just set a pressure at the outlet and the inlet with adapt to give you the correct pressure drop.

February 6, 2015, 15:27		#3
josephmp Member joseph Join Date: Jan 2015 Posts: 32 Rep Power: 11	thank you for answering....but i didnt get the method clearly. what do you mean by adapt? can you plz be a little more elaborate?

February 6, 2015, 15:39		#4
edoan Member Ethan Doan Join Date: Oct 2012 Location: Canada Posts: 90 Rep Power: 13	Lets say the pressure drop in your system should be x Pa. if you set the outlet to y Pa then the inlet pressure will be equal to x+y Pa. do you get my point?

February 9, 2015, 01:09		#5
josephmp Member joseph Join Date: Jan 2015 Posts: 32 Rep Power: 11	thank you very much....since i m interested only in the pressure drop your advice helped me...but for information may i ask is there any method to input the inlet pressure and find the outlet pressure as a result of it?

February 9, 2015, 08:10		#6
edoan Member Ethan Doan Join Date: Oct 2012 Location: Canada Posts: 90 Rep Power: 13	sorry joseph i haven't done anything like that i am not sure if there is a good way. I am thinking you can switch the position of your pressure outlet and velocity inlet where you specify the velocity at the inlet as negitive so it is essentially an outlet and your pressure "outlet" is your inlet.