Simulation is diverging in CFD

me_21_089 — Sat, 20 Jul 2024 20:51:21 GMT

hello, I have a problem in CFD, the Simulation is diverging and This affects the resulting values, I tried to solve the problem but I'm still a beginner, any help or suggestions would be greatly appreciated.

Re: Simulation is diverging in CFD

apolo_vanderberg — Fri, 02 Aug 2024 14:11:03 GMT

From the image nothing looks like its diverging there
What I can see are a couple items/suggestion

1. Most models will require running more than 100 iterations to get to a converged solution.
2. This appears to be a fuselage and you're looking at Drag/Lift?
3. For external aero applications i would recommend extending the domain,

a. To start I'd recommend about 6-7x model height for the height of the domain

b. if you have wings shoot for 4-5 model widths
c typically you may want 6-7 model lengths with the fuselage about a 1/3 from the inlet

4. Watch meshing - I can see meshing artifacts in your solution as it is which may indicate you need more on the body as well as in the transition to the domain which will improve the drag results as well

5. Here's a link from years ago highlighting meshing strategies to correlate with NACA airfoil. You may not need to be as extreme for a design trend but important to be aware of and learn as a beginner

https://www.youtube.com/watch?v=N4z8HcBtL6U

Re: Simulation is diverging in CFD

me_21_089 — Sun, 01 Sep 2024 00:33:29 GMT

Thank you very much ❤️

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Simulation is diverging in CFD

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