# Hydraulic diameter for multiple ducts

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 August 23, 2013, 01:45 Hydraulic diameter for multiple ducts #1 New Member   Jalay Shukla Join Date: Aug 2013 Posts: 11 Rep Power: 3 Hi, I am making a simulation of gas diffusion in room. In which continuous air is coming from 4 ducts and 4 exhausts are there and gas is introduced from some place inside the room. I have used k-e model with realizable and with buoyancy effect. Is this correct for this simulation? And what should be the hydraulic diameter for 4 ducts? Do i need to make 4 individual inlets and give BC to them OR can i give BC to all at single BC,by multiple selection. and what should be the hydraulic diameter that case?

 August 23, 2013, 02:34 #2 Senior Member   Paritosh Vasava Join Date: Oct 2012 Location: Lappeenranta, Finland Posts: 545 Rep Power: 12 It is advised to keep your inlet and outlets individual and not bunch them in to groups. So you can keep the 4 inlets and 4 outlets separate and calculate hydraulic diameter separately for each inlet and outlet.

 August 23, 2013, 04:17 #3 Senior Member     Svetlin Philipov Join Date: Mar 2009 Location: United Kingdom Posts: 176 Rep Power: 8 It depends on the mesh model. If your inlets are not connected before entering the room then you should set BC for each inlet. If you are using circular cross section of pipes then pipe diameter is the hydraulic diameter, else there is a good formula to calculate it.

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