Oscillatory flow in a pipe

tom-uk · June 17, 2009, 09:55

Hi,

I would like to simulate an oscillatory flow crossing a pipe.
I wonder if I have to use periodic boudaries condition (inlet/outlet) or not?
Also can I use a user fonction to define my flow inlet (like: sin(cst*$Time) )?

Thanks in advance.

Tom

A_Lyaskin · June 23, 2009, 07:53

You can use a user defined function BCDEFI to define your inlet, or you can use a table with TIME as independent variable.

As for the outlet, probably you wouldn't need something special, just try with default flow split 1. Or you can try Transient boundary condition, which allow pressure waves escape from the domain, because you'll have some pressure waves.

June 17, 2009, 09:55	Oscillatory flow in a pipe	#1
tom-uk New Member thomas Join Date: Jun 2009 Location: Edinburgh Posts: 12 Rep Power: 16	Hi, I would like to simulate an oscillatory flow crossing a pipe. I wonder if I have to use periodic boudaries condition (inlet/outlet) or not? Also can I use a user fonction to define my flow inlet (like: sin(cst*$Time) )? Thanks in advance. Tom

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June 23, 2009, 07:53		#2
A_Lyaskin Member Anton Lyaskin Join Date: Mar 2009 Location: Samara, Russia Posts: 66 Rep Power: 17	You can use a user defined function BCDEFI to define your inlet, or you can use a table with TIME as independent variable. As for the outlet, probably you wouldn't need something special, just try with default flow split 1. Or you can try Transient boundary condition, which allow pressure waves escape from the domain, because you'll have some pressure waves.