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Old   April 26, 2020, 16:31
Default Floating point exception
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Hello all,

I am working on a counter pipe flow heat exchanger using ANSYS fluent 2D axisymmetric analysis.

I have attempted to run the calculation in the setup section however I get the message:

Reversed flow on 12 faces (100.0% area) of pressure-outlet 13.
Stabilizing pressure coupled to enhance linear solver robustness.
Stabilizing pressure coupled using GMRES to enhance linear solver robustness.

Experiencing convergence difficulties - temporarily relaxing and trying again...

Experiencing convergence difficulties - temporarily relaxing and trying again...

Experiencing convergence difficulties - temporarily relaxing and trying again...

Experiencing convergence difficulties - temporarily relaxing and trying again...
Stabilizing pressure coupled to enhance linear solver robustness.
Stabilizing pressure coupled using GMRES to enhance linear solver robustness.

Experiencing convergence difficulties - temporarily relaxing and trying again...

Divergence detected in AMG solver: pressure coupled Stabilizing temperature to enhance linear solver robustness.
Stabilizing temperature using GMRES to enhance linear solver robustness.

Divergence detected in AMG solver: temperature
Error at host: floating point exception

Error at Node 0: floating point exception

===============Message from the Cortex Process================================

Compute processes interrupted. Processing can be resumed.

================================================== ============================

Error: floating point exception
Error Object: #f

Calculation complete.


It works completely fine when I select 'planar' in the general tab in setup. I am not sure where I am going wrong. Any help would be appreciated

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Old   April 26, 2020, 16:45
Default Axisymmetric
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Fluent's axisymmetric solver has two requirements

1. X-Axis is fixed as axis of symmetry. So, you cannot use any other axis, say, y-axis or any other axis parallel to x-axis defined with axis boundary.

2. There should not be any cell in third and fourth quadrant. Only first and second quadrant can have mesh.
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Old   April 26, 2020, 17:22
Default Geometry
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https://gyazo.com/e3f24a43553355973ed04ae5ea75a74f

Above is my geometry, I believe I have met the requirements
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Old   April 26, 2020, 19:31
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It still gives me the same error?
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Old   April 28, 2020, 11:24
Default Model
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It looks alright while looking at the image. However, click on Mesh Check after changing to Axisymmetric model. See if Fluent gives an error. If not, then everything about the mesh is alright, the problem would be with setup, most likely boundary conditions.
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