interface GGI
 

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

Please post the "domain interface: my interface" section of your setup here. No need for all the CCL.

Hi,

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

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"?

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.

I mean when it is not considered automaticly, I did it manually but it is not solved.

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.

- 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.

Hi,

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.

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.......

Hi,

I found what the problem was. it was the coordinate system I used. I corrected it and it worked.
Thanks