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canopus July 12, 2011 17:57

1D flow
 
Hello
I see so many views and no replies.
I think maybe my question is too simple so it is being ignored but for me it is not.
So I post it again and please let me know your views.

-----------------------------------------------------
I have an academic structured 3D code solving pressure poisson eqn for N-S eqns for unconfined flow.
I want to solve a laminar 1D flow with that by using
1 cell in x & y axis and 300 cells in z dir.

Is this approach correct?

What should be my BCs with respect to pressure for?
x-y(inlet & outlet)
x-z(top & bottom)
y-z(side faces)


Thanks in advance

canopus July 18, 2011 06:17

Come on where are the experts?
Seems everybody is like me without an answer
:D

Rami July 26, 2011 05:00

Quote:

Originally Posted by canopus (Post 315884)
Hello
I see so many views and no replies.
I think maybe my question is too simple so it is being ignored but for me it is not.
So I post it again and please let me know your views.

-----------------------------------------------------
I have an academic structured 3D code solving pressure poisson eqn for N-S eqns for unconfined flow.
I want to solve a laminar 1D flow with that by using
1 cell in x & y axis and 300 cells in z dir.

Is this approach correct?
Yes, it is correct.

What should be my BCs with respect to pressure for?
x-y(inlet & outlet)
x-z(top & bottom)
y-z(side faces)
You do not give the code details. I will assume it is using the FVM. Therefore, BCs for the lateral surfaces (normal to x and y) - which should represent zero normal velocity, free slip and no normal tractions - are natural BCs, meaning you should not prescribe anything (neither for the velocity nor to the pressure). For the inlet one usually prescribe the specific mass flux. At the outlet the pressure is commonly prescribed.

Thanks in advance

I hope this helps,
Rami


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