Convergence

MarkCFDD · September 21, 2022, 04:07

Hello everyone!
I want to simulate 3D air flow in ANSYS Fluent throught a geometry modeled by me in Fusion360. I prepared a mesh with good quality parameters. The best quality I achieved when I prepare mesh in component in workbench "Mesh" and the next I use function "Make polyhedra" and "Improve mesh quality" in Fluent. Minimum orthogonal quality=0,18.
The boundary conditions: mass flow inlet, outflow outlet and no slip walls. I chose k-e turbulence model.
I upload few photos with solution methods, residuals and testing points.

Can I consider this results to be convergent? Chart with residuals is not constant, but all values are below 1e-4.

ChaoLW · September 24, 2022, 05:09

I vote for "yes".

LoGaL · September 24, 2022, 14:36

Continuity below 1e-4 might dictacte not properly converged solution.
Also monitoring area weighted average quantities might be misleading, averages tend to smooth out oscillations.

Can you post a velocity contour of your simulation?

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September 24, 2022, 05:09		#2
ChaoLW New Member Liu Wenchao Join Date: Jan 2021 Posts: 15 Rep Power: 5	I vote for "yes".

September 24, 2022, 14:36		#3
LoGaL Senior Member Lorenzo Galieti Join Date: Mar 2018 Posts: 375 Rep Power: 12	Continuity below 1e-4 might dictacte not properly converged solution. Also monitoring area weighted average quantities might be misleading, averages tend to smooth out oscillations. Can you post a velocity contour of your simulation?