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-   -   axis-symmetric case (http://www.cfd-online.com/Forums/openfoam/76142-axis-symmetric-case.html)

Svensson May 15, 2010 17:23

axisymmetric case
 
I'm trying to simulate a simple problem - current in a pipe of constant diameter. Tried manually and using the utility makeAxialMesh to create axis-symmetric case. After start simpleFoam solver there are deduced data for 3 vector components.

Time = 201

DILUPBiCG: Solving for Ux, Initial residual = 0.000588805, Final residual = 1.64506e-07, No Iterations 2
DILUPBiCG: Solving for Uy, Initial residual = 0.00149572, Final residual = 5.55529e-07, No Iterations 2
DILUPBiCG: Solving for Uz, Initial residual = 0.00907859, Final residual = 3.0994e-06, No Iterations 2
GAMG: Solving for p, Initial residual = 0.00423031, Final residual = 4.10437e-06, No Iterations 19
GAMG: Solving for p, Initial residual = 4.08028e-06, Final residual = 9.36491e-08, No Iterations 20
GAMG: Solving for p, Initial residual = 9.36482e-08, Final residual = 9.36482e-08, No Iterations 0
time step continuity errors : sum local = 7.21952e-10, global = -5.79737e-12, cumulative = -5.79737e-12
DILUPBiCG: Solving for omega, Initial residual = 0.000178982, Final residual = 3.51317e-06, No Iterations 1
DILUPBiCG: Solving for k, Initial residual = 0.00106769, Final residual = 2.67984e-06, No Iterations 2
ExecutionTime = 3.3 s ClockTime = 5 s


As I understand the project should be quasi-two-dimensional. That is two components should be deduced only. Even, if display data of 3 components it is normal for an axis-symmetric of projects, there is one more problem - the component of velocity Uz for quasi-empty dimension most worse to converge. What to do?

sega May 16, 2010 12:40

Well, I'm not sure what your exact problem is ...
Can you be more specific?

akidess May 17, 2010 04:21

It is normal that all three components are still displayed, as the grid is still 3D (just with special cells and boundary conditions). And about Uz: Is it maybe possible that you mixed up X and Z direction during mesh generation (so that Y and Z span your computational plane and X is normal to the side of the wedge)? Did you look at your mesh in paraview to make sure everything is correct?

Svensson May 17, 2010 15:29

Can look and prompt why badly to converge quasi-empty component of velocity Uz. Here the project:
http://rapidshare.com/files/38847831...in_tube.tar.gz

Svensson May 20, 2010 12:35

Well all right, then can, somebody even to show a correct ready example stationary axial-symmetric flow?

akidess May 21, 2010 03:46

Which solver are you using?

Svensson May 21, 2010 15:15

simpleFoam.

akidess May 25, 2010 04:40

Your case doesn't run for me using simpleFoam. I assume you are using 1.6 and I'm still on 1.5, so I can't really help you.

Svensson May 27, 2010 19:13

I have installed OpenFoam 1.5. Hardly has altered the project. The problem is considered. But the quasy-empty direction of viscosity Uz is bad to converge.
Here the project:
http://rapidshare.com/files/39231032....5.tar.gz.html


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