Cfd - familiar with ANSYS Fluent or CFX?

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SUMMARY

This discussion focuses on using ANSYS Fluent and CFX for simulating subsonic flow over an airfoil, specifically the S809 airfoil. The user has completed the Cornell University tutorial but struggles to achieve results that align with physical experiments. Key factors affecting simulation accuracy include the placement of far-field conditions, mesh refinement, and the selection of turbulence models. A recommendation is made to use a mesh of a couple of million cells, ensuring fine resolution near the airfoil and coarser mesh further away.

PREREQUISITES
  • Understanding of ANSYS Fluent and CFX simulation tools
  • Knowledge of computational fluid dynamics (CFD) principles
  • Familiarity with airfoil design and aerodynamics
  • Experience with mesh generation and refinement techniques
NEXT STEPS
  • Research best practices for setting far-field boundary conditions in CFD simulations
  • Learn about mesh refinement techniques specific to airfoil simulations in ANSYS Fluent
  • Explore different turbulence models available in ANSYS Fluent and their applications
  • Investigate validation methods for comparing CFD results with experimental data
USEFUL FOR

Aerospace engineers, CFD analysts, and researchers involved in aerodynamic simulations and optimization of airfoil designs will benefit from this discussion.

DinjiP
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Cfd -- familiar with ANSYS Fluent or CFX?

Is anyone here familiar with ANSYS Fluent or CFX? I have some questions about creating a simulation of subsonic flow over an airfoil. I have done the Cornell University tutorial. I then moved on to try simulating different arifoils, in particular S809, but I haven't been able to get results within a reasonable margin of the physical experiments.

So if there is some where who understands the two modules I named, I would love to go into more detail on what I have done and seek advice on how to improve my process.

Thank you
 
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If the angle of attack is small and you are in the low mach regime you should get results pretty close to the experimental measurements. One problem is usually that the far-field condition is too close to the airfoil and another is that the mesh is not fine enough. For a 2D airfoil you'll probably only need a couple of million cells but it's important to make them fine enough near the airfoil and larger radially outward up to say 25 cord-lengths away from the airfoil. Also, the choice of turbulence model is important.
 
2 million cells for a 2D aerofoil in subsonic flow?
 

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