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-   -   ERROR #002100048 has occurred in subroutine SU_BNEXT (https://www.cfd-online.com/Forums/cfx/158622-error-002100048-has-occurred-subroutine-su_bnext.html)

Mandar saraf August 29, 2015 16:19

ERROR #002100048 has occurred in subroutine SU_BNEXT
 
ERROR #002100048 has occurred in subroutine SU_BNEXT. |
| Message: |
| All vertices for a fluid domain lie on boundaries. This is |
| considered to be a fatal error because control volume gradients |
| cannot be calculated, leading to serious discretization error. |
| |
| A common cause for this error is a mesh which is only one |
| element thick, without symmetry or 1:1 periodicity on the lateral |
| boundaries. If you have this situation, and the domain is |
| two-dimensional, please change the lateral boundary conditions |
| to symmetry or 1:1 periodicity. Alternatively, for |
| three-dimensional simulations, please ensure that your mesh |
| has at least two elements across. |
| |
| Execution is terminating. This error message can be bypassed by |
| setting the expert parameter 'boundary vertex check = f', but |
| be aware that doing so may lead to sigificant solution error.


[ Moderator note: Moved posts from http://www.cfd-online.com/Forums/cfx...1100279-a.html to a new thread ]

Mandar saraf August 29, 2015 16:26

please tell me how to eliminate this error
iam trying to simulate spray dryer, i use porous media and apply interface in fluid and solid.
with same set up i am getting answer, but some time iam getting this error iam very frustated with this thing almost spent my 2-3 days and night to found this but still empty hand, dont knwo what dose this error means and stteing i need to change please help me out of this ..

ghorrocks August 30, 2015 07:31

The error you report ("All vertices for a fluid domain lie on boundaries.") is totally different to the rest of this thread. You will probably get a better response if you start a new thread for a new question in future.

This error is exactly as it is described in the error message - you have some regions of your mesh which have no internal nodes (ie all node lie on boundaries). If you are modelling a general flow domain then you are going to have to remesh with more nodes inside the domain.

And please do not post duplicate posts again. You only need to post a question once. I have deleted the duplicate posts.

Mandar saraf September 3, 2015 14:55

thanks for your reply,
Actually iam facing this problem with only porous and fluid intraction, and as a mesh part iam meshing fluid domain using automatic meshing of ansys workbench icme cfd, 14.5 version, how to proceed for solution than ? please reply

ghorrocks September 3, 2015 18:50

You need to generate a mesh with internal nodes. The error message makes that very clear.

Mandar saraf September 4, 2015 00:35

sir, i have already done meshing with internal node .To cross check this i used section view in ansys meshing.

ghorrocks September 4, 2015 06:26

Somewhere in your model is a location with no internal nodes or you would not get the error message.

Mandar saraf September 4, 2015 06:31

I agree with you. I am modelling 3mm thick perforated plate as a porous region. so might be there is the problem what do you suggest?

ghorrocks September 5, 2015 06:49

It may well be. You should be able to check it easily.

Can you post an image of what you are modelling?


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