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2D axisymmetric model for concentric pipe.

- February 12, 2020 at 8:00 am
  
  jhur
  Subscriber
  
  HI!
  
  I am modelling flow between two pipes(concentric pipe). Fluid flows only between the outer and inner tube. the space inside the inner tube would be just void. I would want to make 2D Axisymmetric model as shown in the figure that i uploaded.
  
  As the axis is not in touch with the inner tube wall. I can not select a geometry to set as axis boundary. So currently filled the void with a rectangle geometry and assigned mesh and then select the wall that is in touch with x axis as rotation axis. It seems not efficient as the mesh in void area is not necessary in calculation. Is there any method to make 2D Axisymmetric model like this without generating a goemetry or mesh in the void area?
- February 12, 2020 at 11:18 am
  
  Rob
  Forum Moderator
  
  In Fluent the axis is along y=0, there's no need to define it if there's no geometry at that location. You only use "axis" when the domain touches the y=0 line.
- February 15, 2020 at 12:00 pm
  
  peteroznewman
  Subscriber
  
  In Mechanical Structural models, the Y axis is the axis of rotation for Axisymmetric models.
  
  In Fluent, the X axis is the axis of rotation for Axisymmetric models.
- February 18, 2020 at 11:19 am
  
  jhur
  Subscriber
  
  Thank you !! it works!!!
- February 19, 2020 at 5:20 am
  
  Keyur Kanade
  Ansys Employee
  
  Please mark this as 'Is Solution' to help others.

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