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I the case of simulation of a rectangular channel 6 m length and 2m in width, flow about 0.01 m3 / s. I took a boundary condition at the upstream (imposed flow) and downstream (height imposed) and solid wall without bond at the edges, the results I find the velocity fields exceeds the limit as shown in Figure. I did not understand the problem

Hello,

The 2 points at the corners in the exit must be declared as liquid with depth imposed, otherwise the first and last segment of your exit are taken as solid, and this is the reason of your weird result at the exit. You probably have to change also the entrance.

With best regards,

Jean-Michel Hervouet

thank you very much sir, I change the 2 point at the conrners as a liquid with depth imposed baut i find the same problem, just the direction of the vector velocity changes !!

Hello,

No, it is much better, except that I do not see the velocities at the exit points, maybe they are not drawn on the picture. You may have small velocities across a solid boundary, due to finite element approximation and the local mesh, but this is not taken into account as a flux and you do have mass conservation.

Regards,

JMH

thank you very much , this is a picture, in the exist points there isn't velocities but i didn't understand why there is small velocity across the solid boundry , i think if i change the mesh it will be better ??

Hi

here i changed the mesh and this is the resutls i think it's the better, thank you very much sir

best regrds

Hello,

We still do not see velocities on the exit, is it an artifact of the post-processor ?

JMH

Hello

I THINK IT'S GOOD NOW

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