SimScale CAE Forum

Simulation Convergence Criterion


#1

Hello,

I was wondering If Simscale displayed the convergence criterion somewhere, and if yes where to find it please ?
Also What meshing methods are used by the software when meshing a complex geometry and is the y+ value is also given somewhere.

Here is a link to my project if needed: https://www.simscale.com/workbench/?pid=4680345490031673387&mi=spec%3A380ab16f-09b3-436e-9d10-92ca7d7a456e%2Cservice%3ASIMULATION%2Cstrategy%3A4

Many Thanks,

Miky


#2

Hey @MikyLu,

The convergence criterion changes from simulation to simulation (e.g. a validation project requires a tighter convergence than a simulation to get qualitative aspects of a flow field). So the criterion is up to the practitioner.

In Numerics > residual controls, you can input residuals criteria to automatically stop the simulation. If all residuals drop under the input values, the software automatically deems your simulation converged:
image

You, however, shouldn’t only rely on residuals to assess convergence. You can set a variety of Result Controls (in the simulation tree) to monitor key parameters. These parameters of course will depend on your simulation. It can be temperature at the outlet, drag and lift coefficients etc etc etc. And then you should also inspect the solution fields looking for anomalies.

The two main meshers are standard and hex dominant. Hex dominant is OF’s SnappyHexMesh.

You can set controls for y+ right here:
image
You’ll need a converged simulation to assess y+ in the post processing environment.

/Ric


#3

Hi,

Really useful answer, thank you so much.
I keep discovering new things :grinning:

Miky