3D External Compressible Flow Analysis of Airplane

- September 3, 2023 at 1:32 pm
  
  Les Bar
  Subscriber
  
  Hi, I am trying to simulate the external flow analysis of an airplane with Mach 0.75 In general settings ı tried steady, transient, pressure-based, density based. Boundary conditions are far-field and symmetry and the domain is a sphere. But even ı tried with the smaller mesh numbers (4 million- 2 million these are the mesh elements that I tried ) I couldn't get the solutions, it took so long. I tried with SST- k omega and Spalarat Allmaras, Implicit solver green gaus node based, and other things are defaulted. What is your suggestion for this type of problem to get a better solution? Please help me because I think I am gonna lose my mind if I take another error from ANSYS.
  Thank you.
- September 4, 2023 at 1:51 pm
  
  Essence
  Ansys Employee
  
  Hello.
  What do you mean by "I couldn't get the solutions"? Does the solution diverge or the results are not accurate or do you face any error? Did you try initializing with FMG? Share the mesh, case setup screenshots please.
- September 4, 2023 at 5:45 pm
  
  Les Bar
  Subscriber
  
  The iterations did not even start.I chose steady,pressure based ( after that ,ı tried density based) and operating conditions for pressure set to zero. AOA is 0,02
- September 4, 2023 at 5:49 pm
  
  Essence
  Ansys Employee
  
  It shows that the generated mesh is poor quality. Please improve the mesh quality (OQ>=0.12 and AR<=400).
- September 5, 2023 at 10:42 am
  
  Les Bar
  Subscriber
  
  Yes, but even when I tried with good mesh it did not work. Is my setup right? I want to know it.
- September 5, 2023 at 10:59 am
  
  Essence
  Ansys Employee
  
  Try using density based solver with FMG initialization. Please refer to the Ansys tutorials for more information.
  https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v232/en/flu_tg/flu_tg_oneram6_wing.html
  https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v232/en/flu_tg/flu_tg_transient_compressible.html

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