MWS v5 subgridding stability

I am just curious if any of you guys have experienced stability problems when using the subgridding on MWS v5. The example I had problems with was a stripline coupler. Adaptive meshing worked fine, but the mesh became very large very quickly and the model was ideally suited for subgridding. Unfortunately, with subgridding enabled various stability problems were apparent, for instance divergance - the energy started to rise until MWS spotted the instability and crashed.

I woiuld be interested if anyone else has had similar problems.

Regards,

Matt

when I heard that MWS would support subgridding in version 5, I was very excited. But apart from some simple problems, I always ran into stability problems when subgridding was turned on.

Hi guys,

The time domain has an inherent limitation. In order to reduce the time step it needs to refine the grid (and the other way around).

I recommend to test Ansoft HFSS which uses Finite Element Analysis. Not only that it has no refinment problems, but also you can control the accuracy of the convergence process. In practice you can choose if you want a "fast" solution (by specifying 5% accuracy or any other number ) or wait a lttle longer until it converges (to 2% accuracy). In addition you can control how much adaptation it does in each pass (refinment per pass) - to accelerate the convergence.

Regards,
Itai

Thanks :)

We know HFSS... I have to say HFSS fails on some really hard (electrically large) projects I calculated quite easily with MWS.
+ HFSS's (even 9.x) GUI really sucks IMHO
Well let's wait with what improvement on subgridding MWS 5.x will come out

cheers

eirp

try v5.1 beta 2. I have encountered less stability problem with this version.

Element7k

I know about HFSS too, this was not supposed to be another HFSS vs MWS post! They both have their respective place.

I guess it's always the same. The version we want to be using is just over the horizon!

I might give the beta version of v5.1 a try.

Cheers,

Matt

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