Unsteady non-uniform flow modelling

egge24 · January 16, 2012, 09:48

Hi,

I want to model an unsteady non-uniform flow in an open channel with FLUENT.

I´m assuming I have to use VOF simulation.

How can I account for the varying water level at the inlet boundary?

What types of boundary conditions I need to use?

Any help will be appreciated!

shk12345 · January 17, 2012, 08:48

hi
If you are using a VOF model you have to run the simulation in unsteady way first.
If you want a varying velocity you can try to run the simulation at a particular velocity for a particular time and then change the velocity at the different time .
By changing the velocity at different time you can do the simulation.

Second you can develop a time dependent equation using any software like matlab or excel and then you can built the udf for that equation and use that udf in velocity inlet for velocity profile

hope that wil help you

regars
shk

January 16, 2012, 09:48	Unsteady non-uniform flow modelling	#1
egge24 Member Join Date: Jan 2011 Posts: 45 Rep Power: 15	Hi, I want to model an unsteady non-uniform flow in an open channel with FLUENT. I´m assuming I have to use VOF simulation. How can I account for the varying water level at the inlet boundary? What types of boundary conditions I need to use? Any help will be appreciated!

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January 17, 2012, 08:48		#2
shk12345 Senior Member shoeb khan Join Date: Nov 2011 Posts: 179 Rep Power: 14	hi If you are using a VOF model you have to run the simulation in unsteady way first. If you want a varying velocity you can try to run the simulation at a particular velocity for a particular time and then change the velocity at the different time . By changing the velocity at different time you can do the simulation. Second you can develop a time dependent equation using any software like matlab or excel and then you can built the udf for that equation and use that udf in velocity inlet for velocity profile hope that wil help you regars shk