Problem with setting of boundary conditions (rotating + stationary)

metaliat93 · February 5, 2016, 04:40

I have problem with BC. I prepared 3 domains in ICEM and import into Pre CFX. 507983532.png
First domain it is inlet pipe, Second - rotating vane machine, third - open around domain with atmosphere pressure. 507983179.png this error getted in solver

I thing, I had problem with boundary: hub wall of vane machine and boundary of open domaine.
This my mesh
This CCL file

ghorrocks · February 5, 2016, 05:41

1. Are you modelling the blades as a solid? You do not model the rotating machine (unless you are modelling heat transfer). You only model the air around the rotating machine.

2. The error message states you have not defined a frame change model at the interface. You will need to do this. Have a look at the CFX tutorials for how they set up frame change interfaces.

metaliat93 · February 5, 2016, 05:50

Quote:

Originally Posted by ghorrocks

1. Are you modelling the blades as a solid? You do not model the rotating machine (unless you are modelling heat transfer). You only model the air around the rotating machine.

2. The error message states you have not defined a frame change model at the interface. You will need to do this. Have a look at the CFX tutorials for how they set up frame change interfaces.

I don t modeling solid blades, it is only volume of gas

507988390.png
507988370.png
this my settings of frame model

ghorrocks · February 5, 2016, 05:52

OK, good. Can you post an image of your full geometry? Where are the 3 domains?

I cannot download your mesh file, so just post an image on the forum.

metaliat93 · February 5, 2016, 05:55

Quote:

Originally Posted by ghorrocks

1. Are you modelling the blades as a solid? You do not model the rotating machine (unless you are modelling heat transfer). You only model the air around the rotating machine.

2. The error message states you have not defined a frame change model at the interface. You will need to do this. Have a look at the CFX tutorials for how they set up frame change interfaces.

Quote:

Originally Posted by ghorrocks

OK, good. Can you post an image of your full geometry? Where are the 3 domains?

I cannot download your mesh file, so just post an image on the forum.

This my screen 507988490.png

metaliat93 · February 5, 2016, 05:57

2. The error message states you have not defined a frame change model at the interface. You will need to do this. Have a look at the CFX tutorials for how they set up frame change interfaces.[/QUOTE]

With this setting i had error ' | ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| Floating point exception: Zero divide '

metaliat93 · February 10, 2016, 03:46

Quote:

Originally Posted by ghorrocks

OK, good. Can you post an image of your full geometry? Where are the 3 domains?

I cannot download your mesh file, so just post an image on the forum.

you can download files mesh in my first post

ghorrocks · February 10, 2016, 06:52

There is a massive range of mesh sizes in this simulation. This is likely to cause a problem. You are going to need to run double precision to get this to converge, and even then you might have a problem.

Does the exit domain need to be so big?

metaliat93 · February 10, 2016, 11:31

Quote:

Originally Posted by ghorrocks

There is a massive range of mesh sizes in this simulation. This is likely to cause a problem. You are going to need to run double precision to get this to converge, and even then you might have a problem.

Does the exit domain need to be so big?

ghorrocks · February 10, 2016, 18:25

Overflow is an FAQ: http://www.cfd-online.com/Wiki/Ansys...do_about_it.3F

But in your case the massive difference in mesh sizes will be contributing to this. As I said before - do you need such a large outlet domain?

metaliat93 · February 12, 2016, 09:26

Quote:

Originally Posted by ghorrocks

Overflow is an FAQ: http://www.cfd-online.com/Wiki/Ansys...do_about_it.3F

But in your case the massive difference in mesh sizes will be contributing to this. As I said before - do you need such a large outlet domain?

yes, i need such a large outlet domain, because I analyse area of spreading solid particles.
Domain with name "Open" needs only for distribution particles. I solved the problem of BC. But I have a next problem with to using "dispersed solid".508605868.png
"In Analysis 'Flow Analysis 1' - Domain 'Inflow': At least one continuous phase must be defined."
Can you advise to me tutorial?

metaliat93 · February 12, 2016, 09:28

508606052.png
I solved without solid particle

February 5, 2016, 04:40	Problem with setting of boundary conditions (rotating + stationary)	#1
metaliat93 Member Aleksandr Join Date: Dec 2015 Location: Kharkov, Ukraine Posts: 93 Blog Entries: 1 Rep Power: 12	I have problem with BC. I prepared 3 domains in ICEM and import into Pre CFX. 507983532.png First domain it is inlet pipe, Second - rotating vane machine, third - open around domain with atmosphere pressure. 507983179.png this error getted in solver I thing, I had problem with boundary: hub wall of vane machine and boundary of open domaine. This my mesh This CCL file

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February 5, 2016, 05:41		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 18,018 Rep Power: 146	1. Are you modelling the blades as a solid? You do not model the rotating machine (unless you are modelling heat transfer). You only model the air around the rotating machine. 2. The error message states you have not defined a frame change model at the interface. You will need to do this. Have a look at the CFX tutorials for how they set up frame change interfaces.

February 5, 2016, 05:52		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 18,018 Rep Power: 146	OK, good. Can you post an image of your full geometry? Where are the 3 domains? I cannot download your mesh file, so just post an image on the forum.

February 5, 2016, 05:57		#6
metaliat93 Member Aleksandr Join Date: Dec 2015 Location: Kharkov, Ukraine Posts: 93 Blog Entries: 1 Rep Power: 12	2. The error message states you have not defined a frame change model at the interface. You will need to do this. Have a look at the CFX tutorials for how they set up frame change interfaces.[/QUOTE] With this setting i had error ' \| ERROR #001100279 has occurred in subroutine ErrAction. \| \| Message: \| \| Floating point exception: Zero divide '

February 10, 2016, 06:52		#8
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 18,018 Rep Power: 146	There is a massive range of mesh sizes in this simulation. This is likely to cause a problem. You are going to need to run double precision to get this to converge, and even then you might have a problem. Does the exit domain need to be so big?

February 10, 2016, 18:25		#10
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 18,018 Rep Power: 146	Overflow is an FAQ: http://www.cfd-online.com/Wiki/Ansys...do_about_it.3F But in your case the massive difference in mesh sizes will be contributing to this. As I said before - do you need such a large outlet domain?

February 12, 2016, 09:28		#12
metaliat93 Member Aleksandr Join Date: Dec 2015 Location: Kharkov, Ukraine Posts: 93 Blog Entries: 1 Rep Power: 12	508606052.png I solved without solid particle