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Different Mesh significantly impacts simulation results

- August 2, 2021 at 2:39 am
  
  dodonn4
  Subscriber
  
  Hi everyone,
  I am working on a fluent simulation to model natural convection heating inside a bag of liquid. I was able to successfully simulate it and get accurate results, then I changed the geometry slightly. The changes to the geometry were not significant at all, the general size and shape are still the same. It is relatively simple geometry too; just an elliptical cylinder that tapers inwards towards the top.
  However, now I noticed that my results significantly vary with different mesh sizes. For example, if I have 150k+ elements in my mesh my results are around 20-30% different than when I have 100-130k elements. And if I have over 250k elements in my mesh the simulation fails.
  Why does the mesh have such a significant impact on the results?
- August 2, 2021 at 2:40 am
  
  dodonn4
  Subscriber
  
  Ignore this, my question accidentally posted twice.

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