# [ICEM] Error in mesh writing

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August 19, 2021, 14:28
problem with the periodic and wall boundaries
#21
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Mohsen
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Hello everyone !
I made the gird for blade-to-blade channel of a turbine cascade, but i have problem with periodic and wall boundary conditions. I didn't use o grid, but split block to make fine mesh near the wall and periodic boundaries. I wanted to create periodic boundaries in Fluent, but when the Fluent reads my mesh it shows only inlet, outlet, and two walls. In other words, Fluent all periodic boundaries and blade walls considers as two walls up and down of the blade. When I create periodic boundaries in ICEM, it considers all vertices on periodic boundaries and walls as periodic vertices!!! Really I don't understand the problem. Please can anyone help me!???
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August 19, 2021, 15:18
#22
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Kira
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Quote:
 Originally Posted by mo.mesbah64@gmail.com Hello everyone ! I made the gird for blade-to-blade channel of a turbine cascade, but i have problem with periodic and wall boundary conditions. I didn't use o grid, but split block to make fine mesh near the wall and periodic boundaries. I wanted to create periodic boundaries in Fluent, but when the Fluent reads my mesh it shows only inlet, outlet, and two walls. In other words, Fluent all periodic boundaries and blade walls considers as two walls up and down of the blade. When I create periodic boundaries in ICEM, it considers all vertices on periodic boundaries and walls as periodic vertices!!! Really I don't understand the problem. Please can anyone help me!???
Hello,

From this thread Setting Periodic Boundary Conditions, Far writes:

This is the what I found from the ICEM 10 tutorial guide.
3.15. Periodicity
Periodic definition may be applied to the model in Hexa. The Periodic nodes function, which is found under Blocking > Periodic nodes, plays a key role in properly analyzing rotating machinery applications, for example.
Typically, the user will model only a section of the rotating machinery, as well as implement symmetry, in order to minimize the model size. By specifying a periodic relationship between the inflow and outflow boundaries, the particular specification may be applied to the model -- flow characteristics entering a boundary must be identical to the flow characteristics leaving a boundary.
3.15.1. Applying the Periodic Relationship
The periodic relationship is applied to block faces and ensures that a node on the first boundary have two identical coordinates to the corresponding node on the second boundary. The user is prompted to select corresponding vertices on the two faces in sequence. When all vertices on both flow boundaries have been selected, a full periodic relationship between the boundaries has been generated.

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