Solver

vass · July 21, 2009, 00:03

Hello, I am beginner in CFX and I am facing a problem in the resolution of my simulation, because every time the solver tries to solve my simulation he has presented the following error 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."

Does anyone could explain me what this means and how I can solve it, would be immensely grateful that could remedy the problem.

ghorrocks · July 21, 2009, 01:04

Hi,

Read the error message, it means exactly what it says. Your mesh has no internal nodes. You need to do another mesh and fix the problem.

Are you trying to do a 2D simulation? If so you need to define the top and bottom surfaces as symmetry planes as described here http://www.cfd-online.com/Wiki/Ansys..._simulation.3F

Glenn Horrocks

July 21, 2009, 00:03	Solver	#1
vass New Member Vinicius Alexandre Sikora de Souza Join Date: Jul 2009 Posts: 7 Rep Power: 16	Hello, I am beginner in CFX and I am facing a problem in the resolution of my simulation, because every time the solver tries to solve my simulation he has presented the following error 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." Does anyone could explain me what this means and how I can solve it, would be immensely grateful that could remedy the problem.

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July 21, 2009, 01:04		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,696 Rep Power: 143	Hi, Read the error message, it means exactly what it says. Your mesh has no internal nodes. You need to do another mesh and fix the problem. Are you trying to do a 2D simulation? If so you need to define the top and bottom surfaces as symmetry planes as described here http://www.cfd-online.com/Wiki/Ansys..._simulation.3F Glenn Horrocks