Coordinates from Ansys Mechanical to Ansys Fluent

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SUMMARY

The discussion focuses on the challenge of using a custom coordinate system in Ansys Fluent for fluid analysis on cerebral aneurysms, specifically after meshing in Ansys Mechanical. The user successfully created a custom coordinate system at the inlet but struggles to set it as the default over the global coordinate system used by Fluent. Attempts to utilize the 'Translate Mesh' option have proven insufficient for achieving the necessary alignment of the mesh axes, and the 'Rotate Mesh' option does not adequately correlate the data from Mechanical.

PREREQUISITES
  • Understanding of Ansys Mechanical for geometry meshing
  • Familiarity with Ansys Fluent for fluid dynamics analysis
  • Knowledge of coordinate systems in computational fluid dynamics
  • Experience with mesh manipulation techniques in simulation software
NEXT STEPS
  • Research how to set custom coordinate systems in Ansys Fluent
  • Explore advanced mesh alignment techniques in Ansys
  • Learn about the implications of coordinate system transformations in CFD
  • Investigate the use of scripting in Ansys for automating mesh adjustments
USEFUL FOR

This discussion is beneficial for fluid dynamics engineers, simulation analysts, and researchers working on complex geometries in Ansys, particularly those involved in medical simulations like cerebral aneurysm analysis.

superduke1200
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Dear all,

I am implementing a fluid analysis on cerebral aneurysms and it is obligatory to apply the origin of my coordinate system at the inlet of the aneurysm.I use Ansys Mechanical for the meshing of my geometry which comes with a pre-applied Global coordinate system. I am able to create a new coordinate system at the inlet of the aneurysm ( 1st image attached ), but my query is as follows;how can I use my 'Custom' coordinate system applied on the Inlet as the default one instead of the global?You see, after I have created my mesh, I am using Ansys Fluent and I must use the 'Custom' coordinate system in order to have accurate results when I calculate coordinate related factors. Fluent uses the Global one, created by default in Mechanical.I have already tried the 'Translate Mesh' option ( 2nd Image attached) based on the offsets derived from Mechanical, but it is not enough, because an alignment of the axes on the Mesh is required. Unfortunately, the 'rotate mesh' option is not adequate to create a correlation from the data provided in Mechanical.Every thought is welcome.
 
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Καταγραφή33.JPG

Ansys Mechanical Global and 'Local' coordinate system at the 'Inlet'
Καταγραφή44.JPG

Ansys Fluent offers a translate mesh option. Useful but not enough in order to align the Mesh
 

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