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EMDS questions

Question asked by caburak on Sep 2, 2008
Latest reply on Jan 25, 2010 by NLY00471

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Hi,

1- Does EMDS support multithreaded operation? If it does, how can I set it?

2- What are the reasonable numbers for Delta Error and Limit on Number of Adaptive passes? This issue is very important, the simulations take so much time.

Thanks,

Burak

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ALEPEREZ Sep 2, 2008 7:28 PM
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Setting Delta S and # adaptive passes is indeed the most important part about using EMDS after drawing good models. If you can, I would highly recommend you take a look at the eLearning for the standalone EMDS that is available from the Knowledge Center. It has some simple labs and a short lecture that gives you a very precise answer to your question. The short answer is that Delta S should be somewhere between 0.001 and 0.05 with the Consecutive Passes Required parameter set to 1-3 depending on the kind of structure you have. # of passes should only be used as a stopping criterion if you have a priori knowledge that a certain mesh density gives you a certain accuracy.

If simulations take a really long time, you can also try setting mesh to Minimum, and of course, trying to simplify the geometry as much as possible.
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NLY00471 Jan 25, 2010 1:44 AM
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Alex,

You didn't answer if EMDS is multi treading like momentum or when it will be. My experience is that it's not in ADS200U1

Regards,
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ALEPEREZ Jan 25, 2010 3:47 AM
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EMDS in ADS is now called FEM in ADS and contains a completely new mesher and two matrix solvers - direct and indirect. The indirect solver is (not yet) multi-threaded, but the direct solver is (can be turned on by user under Advanced Simulation Options but uses more memory). FEM in EMPro has the same meshing and solver technology which continues to evolve rapidly and will see many changes over the coming months.
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NLY00471 Jan 25, 2010 4:53 AM
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thanks
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