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December 6, 2022, 15:17 |
interface GGI
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#1 |
Senior Member
Zese
Join Date: Sep 2013
Posts: 102
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Dear all,
I have a centrifugal fan shown in figure attached then I defined a casing around the fan myself. when I bring both geometries in CFX, the interface between them are not set automatically. even when I define it myself it wasnt solved. should it be some special offset between domains? I dont know what might be the problem. because when I solve fan itself everything is fine. even when I export profile at fan outlet and use it as the inlet of casing it is solving. I will be thankful if you help me. BR |
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December 6, 2022, 15:52 |
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#2 | |
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Quote:
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December 6, 2022, 16:02 |
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#3 | |
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Zese
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Quote:
Thanks for your reply. the following is the CCL for interface # State file created: 2022/12/07 00:31:05 # Build 19.5 2019-07-26T23:55:38.464000 FLOW: Flow Analysis 1 DOMAIN INTERFACE: interface_1 Boundary List1 = interface_1 Side 1 Boundary List2 = interface_1 Side 2 Interface Type = Fluid Fluid INTERFACE MODELS: Option = General Connection FRAME CHANGE: Option = Frozen Rotor END MASS AND MOMENTUM: Option = Conservative Interface Flux MOMENTUM INTERFACE MODEL: Option = None END END PITCH CHANGE: Option = Specified Pitch Angles Pitch Angle Side1 = 360 [degree] Pitch Angle Side2 = 360 [degree] END END MESH CONNECTION: Option = GGI END END END COMMAND FILE: Version = 19.5 END |
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December 6, 2022, 16:23 |
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#4 |
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The interface definition seems correct. As far as I recall, a frame change interface MUST be set manually.
What do you mean by " even when I define it myself it wasnt solved"?
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December 6, 2022, 18:48 |
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#5 |
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Gert-Jan
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I would set Frozen rotor and leave the rest to Automatic.
It is not necessary to specify pitch angles of 360°. CFX interprets it correct if set to automatic is my experience. |
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December 6, 2022, 23:26 |
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#6 |
Senior Member
Zese
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December 6, 2022, 23:28 |
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#7 |
Senior Member
Zese
Join Date: Sep 2013
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The problem is that the interface is not set. However, I changed pitch angle to automatic or changing frozen to mixing plane, I have error.
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December 7, 2022, 01:46 |
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#8 |
Senior Member
Gert-Jan
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- Add two picture of both interface surfaces separately to confirm they are correct in space.
- Add the definition of the rotation axis. - Show the error you get. It might be something completely different. |
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December 8, 2022, 04:00 |
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#9 | |
Senior Member
Zese
Join Date: Sep 2013
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Quote:
the outfile shows me this error: | Vertex Based Partitioning | +--------------------------------------------------------------------+ Coupled partitioning of domains: CASE ROTOR +--------------------------------------------------------------------+ | ERROR #001100279 has occurred in subroutine ErrAction. | | Message: | | SYMASS_CS_ELIM : The solver ran out of temporary space while buil- | | ding a linked list for a domain. Try setting the expert paramete- | | r "topology estimate factor" to a value greater than 1.0. Values | | higher than 1.2 should not be necessary. | | | | | +--------------------------------------------------------------------+ +--------------------------------------------------------------------+ | ERROR #001100279 has occurred in subroutine ErrAction. | | Message: | | Stopped in routine SYMASS_ERROR | | | | | | | | | | | +--------------------------------------------------------------------+ +--------------------------------------------------------------------+ | An error has occurred in cfx5solve: | | | | The ANSYS CFX partitioner exited with return code 1. | +--------------------------------------------------------------------+ +--------------------------------------------------------------------+ | The following user files have been saved in the directory | | D:/erfans fan/fan_pending/dp0_CFX_2_Solution_2/CFX_007: | | | | trace | +--------------------------------------------------------------------+ I increased the topology factor to 1.2 and still I had error. I already had error in partitioning for memory for which I increased the factor to 5 then I had this error. I used to solve complex geometries with over 3milion elements without error of memory now I have 2.4 milion. Picture of interface is as I attached here. |
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December 8, 2022, 04:52 |
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#10 |
Senior Member
Gert-Jan
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I don't inderstand you interface picture at all.
I expect 1 picture of the rotating domain showing 1 cilindrical surface on its outside. And I expect a second picture of the stationary domain showing 1 cilindrical surface on its inside. Both surfaces should fit nicely to allow a sliding interface....... |
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December 9, 2022, 09:05 |
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#11 | |
Senior Member
Zese
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Posts: 102
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Quote:
I found what the problem was. it was the coordinate system I used. I corrected it and it worked. Thanks |
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