Convergence value

How to use openEMS. Discussion on examples, tutorials etc

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openems
Posts: 16
Joined: Tue 24 Mar 2020, 06:07

Convergence value

Post by openems » Wed 15 Apr 2020, 13:33

Hey, I am designing an antenna and I have given timesteps 100000 and Endcriteria as -5(-50dB). But even after 100000 timesteps convergence value is -36 to -38dB(convergence value is saturating nearly at -35dB after 40000 time steps). Is the final results will be fine or do I have to increase time steps?

jjmaloss
Posts: 2
Joined: Wed 08 Apr 2020, 04:45

Re: Convergence value

Post by jjmaloss » Thu 16 Apr 2020, 00:50

My experience is that when simulation reaches a plateau around 35 dB, something is not right in the setting of the simulation. I become really doubtful when spurious oscillations occur. May be you should try to block the simulation at 1.e-3 and see if things are consistent, I may be wrong.

openems
Posts: 16
Joined: Tue 24 Mar 2020, 06:07

Re: Convergence value

Post by openems » Thu 16 Apr 2020, 06:41

Is -30dB convergence is good enough to get proper results or not? It is not about simulation time..

thorsten
Posts: 1393
Joined: Mon 27 Jun 2011, 12:26

Re: Convergence value

Post by thorsten » Sat 18 Apr 2020, 16:24

The lower the remaining energy has decayed the better it is. But as jjmaloss said, sometimes e.g. static charges may get trapped and cannot decay or a high Q resonance may resonate forever (in both cases using more realistic losses may help).

regards
Thorsten

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