tag:blogger.com,1999:blog-5408531818774521078.post1690437803043753768..comments2014-08-17T18:12:51.439-07:00Comments on Radiation theory And Electronic Design: Open source EM simulator, a difficult taskFredyhttp://www.blogger.com/profile/16291794497916598265noreply@blogger.comBlogger14125tag:blogger.com,1999:blog-5408531818774521078.post-49802090966908171312009-04-09T05:35:00.000-07:002009-04-09T05:35:00.000-07:00I think an EM simulator is not a difficult task, b...I think an EM simulator is not a difficult task, because, there is yatpac, a complete EM simulator, developed by the TU munich. (Meep is a good alternative but it will take some years until it is ready an it is not so good for transmission lines.) But it is very difficult to simulate such stuff as skin effect of transmission lines. So the first thing to do, is to complete the transmission lines Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-5408531818774521078.post-86328287381342305802008-05-12T15:22:00.000-07:002008-05-12T15:22:00.000-07:00freefem++ and freefem3D are two different packages...freefem++ and freefem3D are two different packages, Freefem++ is easier to use by trying the examples.<BR/> I tried it under windows and when I went to linux I though freefem3D will be similar but it is not.<BR/><BR/>And installing freefem++ under linux needs to use ./configure, make ....<BR/>you also have to load the correct libraries.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-5408531818774521078.post-51638992413242864042008-04-17T16:19:00.000-07:002008-04-17T16:19:00.000-07:00Are you Alive Fredy ?I am thinking about the Page ...Are you Alive Fredy ?<BR/>I am thinking about the Page 11 on the Docu, and i think i am understanding a little bit, but i am not sure.<BR/><BR/>There is a File which describes an 3d Object, this file will be loaded.<BR/>With this file/Information it will be then created a Poisson Equation which is important if you want to describe an electrical Field for the 3d Object.<BR/><BR/>Regards Markusfeldmaushttp://www.blogger.com/profile/15436492015653930942noreply@blogger.comtag:blogger.com,1999:blog-5408531818774521078.post-43402777581030124702008-04-11T05:37:00.000-07:002008-04-11T05:37:00.000-07:00Here comes a new Question.In the Docu from freeFEM...Here comes a new Question.<BR/><BR/>In the Docu from freeFEM3D, Page 11:<BR/>I don't understand the Problem.<BR/>We want to find (u,v)?<BR/>Should this be a Vector [u,v] ?<BR/>What does "in O" means ?<BR/>Does this mean in the Domain 0 ?<BR/>What does "on %DELTA O" means ?<BR/>Is that dO ?<BR/>Than this means a small Piece of that<BR/>Domain ?<BR/><BR/>Sorry i only know the German Words.feldmaushttp://www.blogger.com/profile/15436492015653930942noreply@blogger.comtag:blogger.com,1999:blog-5408531818774521078.post-85752648392410342632008-04-11T04:10:00.000-07:002008-04-11T04:10:00.000-07:00freeFEM3D is on the same side as freeFEM++. If you...freeFEM3D is on the same side as freeFEM++. If you use Debian, you can just install it by<BR/>apt-get install freefem3d<BR/><BR/>I didn't get any Grafics to run with<BR/>freefem3d, but it works in the console.<BR/>Under /usr/share/doc/freefem3d/<BR/>is the Docu with some Pictures in the Docu and example Problems.<BR/>But the Docu was a little bit confusing.feldmausnoreply@blogger.comtag:blogger.com,1999:blog-5408531818774521078.post-91147135161571066682008-04-11T01:58:00.000-07:002008-04-11T01:58:00.000-07:00What is PDE ?Partial Diferential equationyou need ...What is PDE ?<BR/>Partial Diferential equation<BR/>you need to solve PDE in order to get the solution of the electromagnetic vectors. <BR/><BR/>What is the Definition of the FEM ?<BR/>Finite Element Method, meshing technique. please have a look at the book Numerical techniques in electromagnetic from Sadiku <BR/> <BR/><BR/>What is Domain ?<BR/>you can solve the problem in dif domain frequency sunnySanhttp://www.blogger.com/profile/16291794497916598265noreply@blogger.comtag:blogger.com,1999:blog-5408531818774521078.post-64892917214358639252008-04-10T21:52:00.000-07:002008-04-10T21:52:00.000-07:00Good morning all,I am in need of some Answers and ...Good morning all,<BR/><BR/>I am in need of some Answers and no further Questions, so<BR/>please answer this Questions as simple as you can.<BR/>Mathemaical examples are welcome.<BR/><BR/>I will write some Docu for the EM.<BR/><BR/>What is PDE ?<BR/>What is the Definition of the FEM ?<BR/>What is Domain ?<BR/>What is Fictious Domain ?<BR/><BR/>@Fredy<BR/>What is the difference between freeFEM++ feldmaushttp://www.blogger.com/profile/15436492015653930942noreply@blogger.comtag:blogger.com,1999:blog-5408531818774521078.post-86061288169430045052008-04-10T11:08:00.000-07:002008-04-10T11:08:00.000-07:00I read the freefem3d and maybe post someQuestions ...I read the freefem3d and maybe post some<BR/>Questions and Impressions next Days. :-)feldmaushttp://www.blogger.com/profile/15436492015653930942noreply@blogger.comtag:blogger.com,1999:blog-5408531818774521078.post-71601327057888433622008-04-10T02:04:00.000-07:002008-04-10T02:04:00.000-07:00Another open source program I looked at is FreeFEM...Another open source program I looked at is FreeFEM++ http://www.freefem.org/ff++/<BR/>It is a very good FEM engine under c++. I find a bit difficult to understand the way they handle Helmholtz equation as the use their own notations and simplifications. Look at example 3.10 of their doc.<BR/><BR/>They say on the site that they are working on a 3D solution. (now a 2D)<BR/>2D is already a good sunnySanhttp://www.blogger.com/profile/16291794497916598265noreply@blogger.comtag:blogger.com,1999:blog-5408531818774521078.post-78499161862075927522008-04-09T23:50:00.000-07:002008-04-09T23:50:00.000-07:00I did read the Tutorial Chapter 2.1 for Poisson Eq...I did read the Tutorial Chapter 2.1 for Poisson Equation.<BR/>This Program seems to notice on 2D Problems only.feldmaushttp://www.blogger.com/profile/15436492015653930942noreply@blogger.comtag:blogger.com,1999:blog-5408531818774521078.post-47077802621185573742008-03-14T04:12:00.000-07:002008-03-14T04:12:00.000-07:00I just had a quick look at pdnmesh it uses FEM, bu...I just had a quick look at pdnmesh <BR/>it uses FEM, but it seems that it is only good for 2D simulation.<BR/>(could solve already many EM problems) <BR/>it is program in C, I would prefer C++ .<BR/>Still a good package.<BR/>thankssunnySanhttp://www.blogger.com/profile/16291794497916598265noreply@blogger.comtag:blogger.com,1999:blog-5408531818774521078.post-2703779540474974732008-03-14T01:56:00.000-07:002008-03-14T01:56:00.000-07:00Found an GPL automatic mesher: http://pdnmesh.sour...Found an GPL automatic mesher:<BR/><BR/> http://pdnmesh.sourceforge.net/<BR/><BR/>Probably useful...stefannoreply@blogger.comtag:blogger.com,1999:blog-5408531818774521078.post-26111882843389570422008-03-02T08:52:00.000-08:002008-03-02T08:52:00.000-08:00Thanks Stefan, This is a nice way to implement it....Thanks Stefan,<BR/> This is a nice way to implement it.sunnySanhttp://www.blogger.com/profile/16291794497916598265noreply@blogger.comtag:blogger.com,1999:blog-5408531818774521078.post-6623383285675192008-03-02T04:25:00.000-08:002008-03-02T04:25:00.000-08:00I suppose we need it that way: 1) read in data (e....I suppose we need it that way:<BR/><BR/> 1) read in data (e.g. from gds)<BR/> 2) visualize data and add other information (e.g. height info)<BR/> 3) mesher<BR/> 4) solving the PDE's (e.g. for EM or thermal problems)<BR/> 5) save result data in whatever format<BR/> 6) visualize and/or extract result data<BR/><BR/>Each of the tasks can be separated and can be considered a task to accomplish. I Stefannoreply@blogger.com