ERROR #002100048 has occurred in subroutine SU_BNEXT
Hi everyone
I want to simulate a 2D 90 degree bent. I have the sides as 1:1 periodicty. my mesh is 1 element thick. i encountered this message " 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. I have run it successfully before.Now I added some expression to it.I want to have moving mesh and move the walls. please help me |
The error message explains in some detail what the problem is. You have a domain which is only one element thick.
If you cannot work this out, please post an image of your model. |
1 Attachment(s)
Hi Horrocks
thanks alot yes.my domain is 1 element thick because I want to have 2D simulation.my problem is axissymetric so I should use periodicity as boundary condition.As mentioned in the text I use 1:1 periodicity but it doesnt work.when I changed it to symmetry the error was vanished. I paste the image of it. I appreciate your attention.Attachment 28420 |
For a 2D simulation you need to use symmetry planes. For 2D with swirl you need to use periodic boundaries. The error message is suggesting your first try used a wall, which of course will not work at all and gives you an error message.
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I have swirl at inlet(the flow enters with 60 degree related to radial direction) so I need periodic.I tried automatic&GGI&1:1 for mesh connection,but none of them worked. I solved this before without any expression for moving the wall.I think the error is not related to the expression what should I do now? please guide me |
What expression for moving the wall? What are you trying to do?
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Thanks for your attention I want to move the walls under the impact of a target pressure.I defined two expressions as displacement(for moving the two walls) I use specified displacement for mesh motion of the two walls(that two expressions)and stationary option for inlet and unspecified option for outlet and periodic sides. why it works as I change the sides to symmetry? what should I do |
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