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July 27, 2023, 08:16 |
Rotational Domain and Radiation
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#1 |
Member
Meysam
Join Date: Dec 2019
Posts: 80
Rep Power: 6 |
Hi everybody,
I tried simulating a model which includes rotational and stationary domains. I have the heat transfer in my model , therefore I used the total energy model. When I wanted to simulate it with thermal radiation (DiscreteTransfer , participating Media model), I get the error below: Pitch change is not supported with Discrete Transfer or the Monte Carlo Model. Is there any point that I should consider? How can I simulate a model which includes both rotation and radiation? regards, |
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July 27, 2023, 11:41 |
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#2 |
Senior Member
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The message told you already:
You need the same pitch on both sides of the interface. Can you replicate the domain on either side until the pitch is the same?
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July 27, 2023, 13:15 |
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#3 | |
Member
Meysam
Join Date: Dec 2019
Posts: 80
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Quote:
I have 360° Pitch on both sides. I simulated the model once with rotation and heat transfer but without radiation. This time I wanted to simulate it with radiation but made an error. |
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July 31, 2023, 04:16 |
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#4 |
Member
Meysam
Join Date: Dec 2019
Posts: 80
Rep Power: 6 |
Hi,
is there anybody to guide me? As I mentioned, the pitch changes are 360° for both sides. And I could also simulate the model without radiation. When I wanted to consider the radiation in my model, I face with the error. Is it something about my mesh quality? +--------------------------------------------------------------------+ | ****** Warning ****** | | | | Topology simplification cannot be applied to domains with | | 'Discrete Transfer' or 'Monte Carlo' radiation if boundary | | coarsening is restricted to face sets (default behaviour). | | In order to allow topology simplification for these domains, the | | boundary coarsening must be restricted to boundary patches by | | setting the expert parameter 'radiation agglomeration option=0'. | +--------------------------------------------------------------------+ +--------------------------------------------------------------------+ | Radiation Coarsening Information | +--------------------------------------------------------------------+ Domain Name : Rotor Target coarsening rate = 64 Number of fine grid elements = 1799137 Number of radiation elements = 46598 Actual coarsening rate = 38 +--------------------------------------------------------------------+ | ERROR #001100279 has occurred in subroutine ErrAction. | | Message: | | Pitch change is not supported with the Discrete Transfer or Monte | | Carlo model | | | | | | | | | +--------------------------------------------------------------------+ +--------------------------------------------------------------------+ | An error has occurred in cfx5solve: | | | | The ANSYS CFX partitioner exited with return code 1. | +--------------------------------------------------------------------+ This run of the ANSYS CFX Solver has finished. |
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July 31, 2023, 05:13 |
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#5 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
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The error message is pretty clear - you have a pitch change across an interface and this is not supported.
If you cannot find the error please post your output file and we will try to help you.
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Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum. |
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July 31, 2023, 05:25 |
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#6 |
Member
Meysam
Join Date: Dec 2019
Posts: 80
Rep Power: 6 |
If you cannot find the error please post your output file and we will try to help you.[/QUOTE]
Dear Ghorrocks, I am sending you the output file. |
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July 31, 2023, 07:01 |
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#7 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
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Please read the documentation, Solver Modelling Guide, section 5.3.3, about pitch change.
Have you tried Pitch Change Option = "Automatic", or maybe "None"? I suspect your specifying pitch angles are causing the problem, even though the pitch angles you define mean no pitch change is required.
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July 31, 2023, 08:13 |
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#8 | |
Member
Meysam
Join Date: Dec 2019
Posts: 80
Rep Power: 6 |
Quote:
I changed the pitch change option to None, then it worked. I read the section, now I have another question. let imagine two interfaces in 2 Rotation and Stationary domains have different mesh elements, but overlap themselve compeltely donīt we need pitch changes? |
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July 31, 2023, 10:13 |
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#9 |
Senior Member
Join Date: Jun 2009
Posts: 1,804
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The pitch change model is based on the pitch of the boundaries touching the interface. It is independent of the mesh used to solve it.
Be careful not to confuse mesh with the geometry either.
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