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-   -   how to set BC for flow at a sharp open-channel junction? (https://www.cfd-online.com/Forums/openfoam-pre-processing/120890-how-set-bc-flow-sharp-open-channel-junction.html)

 ntchuyen July 16, 2013 22:45

how to set BC for flow at a sharp open-channel junction?

1 Attachment(s)
Hi everyone,

I am simulating 3D flow at a sharp open-channel junction. I use the solver interFoam with k-epsilon model. At initial time, I set BC as the figure in attached file.
The result is very strange. It looks like having a strong flow from the wall opposite of tributary channel to push water cross the main channel.

Thank you very much.

 vatavuk July 17, 2013 07:28

Hi Chuyen,
Welcome to the fórum!
The inlet velocities in the two inlet surfaces are in the same direction (0 0.6 0). The velocities should be in directions normal to the surfaces.
Best Regards,
Paulo

 ntchuyen July 17, 2013 09:35

Hi Paulo,

But at the main inlet, the normal direction of surface is x-direction and at the tributary inlet, the normal direction of surface is y-direction. So I set the velocity Um = ( 0.06 0 0 ) (x-direction) at the main inlet, and Ub = ( 0 0.6 0 ) (y-direction) at the tributary inlet (the velocities at two inlets are different). is it wrong?

It's really doing my head in.

Best regard,

Chuyen.

 ntchuyen July 18, 2013 06:57

Hi everybody,

I'm sorry for annoying everyone. I just fix my error. It is due to the mistake of gravity direction.

Thank you very much.

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