HAGEN-POISSEUILLE LAW

[raback]

Hi

No slip is just another way of saying that all velocity components are zero. For some turbulence models this is more complicated but for this case they are the same.

-Peter

[Andrea_P]

In elmer the boundary pressure is positive with a normal coming out of the body. Normally in 2D you make the tangent velocity 0.

Based on the picture to have the fluid flow from left to right the left boundary condition would be

Boundary Condition 1
Name = "inlet"
Pressure = -0.023
Velocity 2 = 0
End

The outlet would be
Boundary Condition 1
Name = "outlet"
Pressure = 0
Velocity 2 = 0
End

The other two would be just wall conditions, or doing
Velocity 1 =0
Velocity 2 = 0
is the same as the wall condition.

Hi Kevin,
I have run the original case.sif that you have published and it works perfectly. Nevertheless, when I change the boundary conditions by using a pressure gradient, I have used the same pressure difference plotted in the previous case, I do not have the same results. I attached the new case.sif
-Andrea

[Andrea_P]

Hi,
I have fixed the case.sif and I think that I have obtained similar results between the velocity inlet case and the pressure inlet case. I attached the new case.sif and the images. Thanks in advance for your suggestions and your opinions.
-Andrea

[kevinarden]

Looks good