Periodic boundary condition error
I want to make a simulation of axial fan and use Periodic Boundary Condition. But i still cant to make my side wall, to be a periodic. i've been used the non-conformal. but it still cant work. Please, i need help.
While in TUI show like this /grid/modify-zones> make-periodic Periodic zone [()] 5 Shadow zone [()] 7 Rotational periodic? (if no, translational) [yes] yes Create periodic zones? [yes] yes Error: Failed to make zones periodic. Error Object: #f |
Periodic BC
Creation of periodic boundary requires conformal mesh across both periodic boundaries. For a axial fan, periodic boundary is not a good condition.
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so do you have any methode suggestion for me, to simulate axial fan? |
Besides conformal mesh on periodic boundaries, go to cell zone conditions>edit and see if the rotation axis is the same as your fan rotation axis.
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Periodic Conditions
If the mesh is same at both boundaries that are supposed to be periodic, then you can use TUI to generate periodic boundary. If that is not the case, then change both of the boundaries to Interface using Boundary Conditions panel. Then, go to Mesh Interface, and create Periodic Boundary using Interface option. This is less accurate and more time-consuming per iteration but the difference won't be significant if meshes on both boundaries have similar scale.
In any case, you need to set up the cell zone origin and its axis correctly before creating periodic boundary. |
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Periodic BC
If you use Interface option to generate periodic bc and it still is unable to generate it, then most likely the error is in your cell zone setup (origin and axis) or name selections of the periodic boundaries.
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Warning
Instead of rephrasing, better to copy the Warning issued by Fluent in the post. That will be more helpful in understanding the issue.
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Different number of faces
Since there are different number faces on each boundary, you cannot use TUI commands to generate periodic boundary. The alternative is to use Mesh Interface with Periodic Boundary Condition option. Convert both boundaries to Interface under Boundary Conditions. Then, under Mesh Interfaces, create an interface using both boundaries. Do it manually instead of Automatic Generation and select Periodic BC option. There are two periodic option, one is boundary condition and the other one is for periodic repeats. Select periodic boundary condition.
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Dot product of flow direction and area normal is zero. Check the specified flow direction on Mass Flow Inlet boundary conditions for thread 9. do you know why this sign show up? |
Mass Flow Inlet
Check the boundary with zone ID 9 where you have mass flow inlet. You might have chosen direction instead of normal to boundary. Either make it normal to boundary or provide correct direction. If you have many inlet boundaries, then following command could be useful to find out the name of the boundary
(zone-id->name 9) |
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