Search found 173 matches

by Hale_812
Fri 16 Nov 2018, 07:20
Forum: News
Topic: openEMS.de is back up again
Replies: 13
Views: 43224

Re: openEMS.de is back up again

>That host PC started having problems and constantly shredding the VM. Virtualbox? It is a well known shredder of VM descriptor files. You have to put backup there and check for the consistency with a script every time VBOx is tarting your VM. Oracle (then Sun, Innotek) have this bug for longer than...
by Hale_812
Fri 14 Sep 2018, 02:12
Forum: Usage
Topic: Circuit Co-Simulation
Replies: 5
Views: 6699

Re: Circuit Co-Simulation

I think, CST recalculates the capacitor, when changed. HFSS do. It is just possible to avoid iterative remeshing from the scratch. The most time consumed by time-domain solvers goes to iterative remeshing(refining). So, when you reuse pre-meshed models, a false impression of "not recalculating", can...
by Hale_812
Mon 27 Aug 2018, 02:59
Forum: Usage
Topic: Patch array antenna model
Replies: 5
Views: 6505

Re: Patch array antenna model

cutting corners is for excitation of transverse mode in elliptically polarized antennas. you can google for elliptical patch antenna pictures, there are a lot of examples. you can make a "priority cut", since there are no boolean operations (so sad). Or use an extruded poly. Personally, I prefer lat...
by Hale_812
Fri 24 Aug 2018, 04:24
Forum: Feedback
Topic: Win:AppCSXCAD very slow on start after Spectre/Meltdown upd.
Replies: 4
Views: 7616

Re: Win:AppCSXCAD very slow on start after Spectre/Meltdown

Looks like the problem is not in the APPCSXCAD itself, but in how it is intercepted by antiviruses after the Windows kernel update. I have the same slowdown in MSSE, and in TrendMicro, and probably in ESET (however can not confirm for sure). Disabling any of these antiviruses lets the tool start nor...
by Hale_812
Thu 23 Aug 2018, 02:49
Forum: Usage
Topic: Patch array antenna model
Replies: 5
Views: 6505

Re: Patch array antenna model

1)After MS updated Windows 7-10 kernels, fixing Spectre and Meltdown vulnerabilities, APPCSXCAD behaves very weird. Generally it creates delay when intercepted by antiviruses, from 15 seconds to 15 minutes; rarely crashing. Probably, nothing can be done without making totally new tool for Windows. 2...
by Hale_812
Wed 22 Aug 2018, 03:32
Forum: Usage
Topic: lumped port excitation
Replies: 2
Views: 4121

Re: lumped port excitation

probably, the port is smaller than the mesh cell.
make some code that snaps to the nearest mesh nodes (you can use matlab's interpolation functions in nearest point mode), when creating lumped port's box. of course, as a resistor, it should connect some metal pads.
by Hale_812
Mon 20 Aug 2018, 02:27
Forum: Development
Topic: failsafe operation/state save-restore
Replies: 2
Views: 5919

Re: failsafe operation/state save-restore

I am modelling pulse scattering in the open space with obstacles (1-2 meters in every direction). Some guys asked us for demonstration why we do things one way and not another, as they suggested. As a time-domain method, OpenEMS gives great intelligible images. But it takes time. Rendering is also v...
by Hale_812
Tue 24 Jul 2018, 10:29
Forum: Usage
Topic: Which hardware for openEMS?
Replies: 24
Views: 26846

Re: Which hardware for openEMS?

>171.45 MC/s These MC/s are not comparative, and totally rely on the problem size. (and available cache/bus throughput of course). I guess, you have used the same problem for benchmarking? With smaller model, windows probably can be slower because of the memory organization, where all the unused ram...
by Hale_812
Tue 24 Jul 2018, 10:19
Forum: Usage
Topic: Which hardware for openEMS?
Replies: 24
Views: 26846

Re: Which hardware for openEMS?

Hale_812:Regarding buffered/ECC RAM. Which do you feel is more important, the buffering, the error correction, or both? In modern Intel-based workstations that is usually a combined solution. Buffering boosts RAM subsystem electrical reliability enormously, and ECC is a failsafe mechanism for unreh...
by Hale_812
Tue 24 Jul 2018, 09:54
Forum: Development
Topic: failsafe operation/state save-restore
Replies: 2
Views: 5919

failsafe operation/state save-restore

Since computation takes great amounts of time and disk space, I often have problems of restarting week-long simulations once and once again. There is a pair of simple scenarios: 1)Some system error or power shortage (like someone decided to "reduce" power usage before going home). 2)HDD is full, and...