Search found 170 matches

by Hale_812
Wed 05 Feb 2020, 06:42
Forum: Usage
Topic: The problem with leaky resonator characteristic modes? How?
Replies: 0
Views: 3152

The problem with leaky resonator characteristic modes? How?

It is known that FDTD is hard to analyze closed cavities where the signal does not decay well. But there is an opposite problem. Lets consider a resonator with PEC on the top and bottom, but PMC on the sides! When loaded with 2 perfectly matched ports, it works more or less as a filter (if there is ...
by Hale_812
Mon 03 Feb 2020, 02:23
Forum: Usage
Topic: Excitation of a resonator in polar coordinates.
Replies: 2
Views: 1060

Re: Excitation of a resonator in polar coordinates.

the field. The sourceit is broken into two dipoles. it leaks in the center, giving preference to wrong modes. I was wondering, if there is a right way of exciting the field uniformly along the diameter line? But looks like no. at the moment I am changing the mesh generator script to rectangular coor...
by Hale_812
Mon 03 Feb 2020, 02:19
Forum: Feedback
Topic: bug in InitFDTD 'MaxTime'
Replies: 5
Views: 1956

Re: bug in InitFDTD 'MaxTime'

:)

really, that should be long. can I ask for additional stop condition in future version if you plan do publish such? Since the real time monitor is already implemented it looks like a natural feature.
by Hale_812
Fri 31 Jan 2020, 04:01
Forum: Feedback
Topic: bug in InitFDTD 'MaxTime'
Replies: 5
Views: 1956

bug in InitFDTD 'MaxTime'

I use FDTD = InitFDTD('CoordSystem', 1,'MultiGrid',conf.r/2, 'MaxTime', (60*60*10)); for calculating during 10 hours, each made up of 60 minutes, each made up of 60 seconds. However, the simulation does not stop after 15+ hours. In the help it is written that 'MaxTime' is a "real" time of simulation...
by Hale_812
Fri 31 Jan 2020, 02:54
Forum: Usage
Topic: Excitation of a resonator in polar coordinates.
Replies: 2
Views: 1060

Excitation of a resonator in polar coordinates.

I am trying to simulate a resonator excited by a magnetic loop. Since I am interested more in fundamental modes, and do not know the impedance yet, I place a magnetic probe inside (see the wedges in the picture) instead of wrappint the loop around. Taking one probe was not possible, because it creat...
by Hale_812
Wed 16 Oct 2019, 02:17
Forum: Feedback
Topic: from openems to paraview
Replies: 1
Views: 2764

Re: from openems to paraview

I am confused about what are you trying to reach, and can only guess what is "rheumatic distribution". ParaView is neither simulator nor editor. It just visualizes data, and it is neither stabile nor fast in this; vith fundamental limitations making time-mapped evolution data very hard and indirect ...
by Hale_812
Wed 23 Jan 2019, 00:53
Forum: Usage
Topic: FDTD Computation Time Estimation
Replies: 2
Views: 1723

Re: FDTD Computation Time Estimation

it is hard because you don't know how the wave would propagate and where...
For sure you only know the time of excitation.
But you can check the evolution in ParaView during simulation and estimate using your expectations and path passed... i.e. "use the force, Luke"...
by Hale_812
Fri 18 Jan 2019, 01:00
Forum: Usage
Topic: Thirds Rule (FDTD Mesh Grid)
Replies: 14
Views: 5657

Re: Thirds Rule (FDTD Mesh Grid)

AFAIK 1/3 rule has meaning generally in PCB simulations. Probably, ONLY in pcb simulations. So first, there should be an agreement about layers for a tool to work. There is such tool: http://openems.de/forum/viewtopic.php?f=3&t=567 (I didn't try it myself, because it still needs some compiling and i...
by Hale_812
Fri 18 Jan 2019, 00:44
Forum: Usage
Topic: OpenEMS multi-processor performance
Replies: 20
Views: 18023

Re: OpenEMS multi-processor performance

t> but your post sounds very negative to me and I do not really like that. Please give constructive feedback I am commenting the discussion about "HFSS or Empire" you have started yourself t> If you have these kind of resources (money) it would make sense to think about a commercial FDTD solver (e.g...
by Hale_812
Thu 17 Jan 2019, 06:58
Forum: Usage
Topic: OpenEMS multi-processor performance
Replies: 20
Views: 18023

Re: OpenEMS multi-processor performance

Garias, let me express my scepticism about the configuration. It is exactly the configuration I always try to avoid. There are too many SLOW cores, and too little RAM, and channels per-core. This machine is good for fast repetitive solving of short equations, working with small chunks of huge data (...