Stop Criteria (%)

[Anonymous]

I am trying to perform a Convergence test on a model to find a mesh size before Shape Generation, in my case I'm focusing on Displacement, but I am getting confused with the Stop Criteria function. According to the Description found on Autodesk, the Stop Criteria means 

"Ceases refinement when the difference between the last two results is less than the specified (%) value. The value increment is 1. The refinement can cease when it reaches the maximum number of refinements, even if Stop Criteria is met."

When running the Simulation I'm setting the h Refinements as 5 and the Stop Criteria as 0.2% but for every Element, Size altered the following results were given:

	Average Element Size	Minimum Element Size	Nodes	Elements	Displacement Max	Displacement Min	Convergence Rate on Displacement
1	0.1	0.2	6932	4062	0.004014	0	0.019%
2	0.0875	0.2	14577	9072	0.004005	0	0.027%
3	0.075	0.2	19628	12423	0.004018	0	0.010%
4	0.0625	0.2	27391	17621	0.00417	0	0.042%
5	0.05	0.2	37801	24567	0.004016	0	0.008%
6	0.0375	0.2	64253	42665	0.004036	0	0.188%
7	0.0315	0.2	79348	52966	0.004026	0	0.005%
8	0.031	0.2	79744	53499	0.004025	0	0.000%
9	0.025	0.2	120435	81897	0.004028	0	0.000%
10	0.0125	0.2	454763	319589	0.004031	0	0.000%
11	0.00625	0.2	2104811	1510626	0.004031	0	0.000%

Does this mean that the perfect mesh size is 0.0375 at 0.188% which is less than the value? Or is it 0.0315 which is the least of the value?

[johnsonshiue]

Hi! Is the mesh done in Inventor Stress Analysis or Shape Gen? These are solved differently.

Many thanks!

[Anonymous]

Hi,

No this is done first through Stress Analysis, to find the right mesh size through convergence study in relation to displacement.

(I first ran the simulation without the convergence setting through normal simulation, then changed the parameters in the convergence settings which gave the results as shown in the previous post)

After which the chosen mesh size will be placed in Shape Generator, meaning another study.

Thanks

[JDMather]

I think there might be a few misconceptions about FEA involved here.

Can you Attach your Inventor file here?

Are you a student?