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I have made a model for a simple rectangular channel where I have set the boundary conditions of the closed boundary in matisse as 2 2 2 2, however the results shows that there is velocity in the flow direction at the solid boundary which is not logic. Do anyone have a reason for that.

Hello,

can you show us what you mean with a picture (which is worth a million words ).

Not having seen anything, please note that you should see velocity vectors along the boundary, at the boundary point. In a bent of your boundary, you will see the vector as if it was going out, but it is only graphic. We can assure you that the physical through a solid boundray is exactly zero.

Hope this helps.
Sébastien.

Hello,

maybe also this post will answer your question:

www.opentelemac.org/index.php?option=com...=16&id=420&Itemid=89

Best regards,
Clemens

Attached is an image for the flow velocity

Hi
For me your result looks like correct!
You probably have some small problems on the corner of your model but the velovity seems to be correct.
Closed boundaries doens't mean velocity = 0 that just mean the normal component of velocity = 0. For the tangential component it depend of your configuration. By default it's a slip condition. But you could also add friction on lateral boundaries.

Hope this helps

Do you have explanation for the probelm at the corners, because I usually face this problem. I usually set the corner point as part of the solid boundary not the open boundary