WEBVTT - Eddy currents simulation with QuickField 00:00.000 --> 00:17.000 Hello. My name is Alex. I am support engineer in QuickField support team. Today I would like to tell you how C3D kernel helped QuickField to become a powerful 3D electric analysis tool. 00:18.000 --> 00:32.000 QuickField is a finite element simulation software distributed by the Tera Analysis. Headquarters are located in Svendborg, Denmark and we have a distribution office in Toronto, Canada. 00:34.000 --> 00:49.000 QuickField is widely used for electromagnetic, heat transfer and mechanical stress problem analysis in electrical engineering, manufacturing, biology and many other industries and research fields. 00:50.000 --> 00:59.000 These applications are covered by the analysis features offered by QuickField. 1:02.000 --> 01:26.000 There are DC, AC and transient packages to perform electric and magnetic analysis. And we have steady-state and transient packages for heat transfer analysis. And a linear stress analysis. It is also possible to perform multiphysic analysis by coupling different packages. 01:27.000 --> 01:46.000 List of customers is very diverse and includes major US and European research centers, international industrial corporations and educational organizations and individual researchers and inventors around the world. 01:47.000 --> 01:55.000 Today I would like to speak about Naval Research Laboratory and their experience using QuickField. 01:57.000 --> 02:20.000 Dr. Raymond Allen is one of leading researchers at the Plasma Physics division of the Naval Research laboratory. He has published more than 80 papers. He has been the General Chair of the major international Pulsed Power and Plasma Physics Conference in 2019, Orlando, Florida 02:20.000 --> 02:23.000 Dr. Allen uses QuickField since 2001. 02:28.000 --> 02:34.000 Initially he used our product for 2D Electrostatic and DC Conduction. 02:35.000 --> 02:43.000 But later NRL ordered additional analysis options, including transient magnetics and heat transfer. 02:43.000 --> 02:53.000 They used QuickField for 2D analysis of devices they developed for pulsed power and plasma physics applications. 02:54.000 --> 03:05.000 Then in 2013 we released first 3D version of QuickField, based on free geometrical core. 03:06.000 --> 03:14.000 Dr. Allen was one of our first customers who started using new 3D features 03:14.000 --> 03:20.000 And it soon became obvious that 3D functionality was not sufficient. 03:20.000 --> 03:35.000 Limitation of single-body topology, insufficient finite element mesh size and unstable behavior of geometric core didn't allow our customers to rely on our product. 03:36.000 --> 03:47.000 This gave us understanding that we need to replace the free 3D library by commercial 3D library. 03:48.000 --> 03:55.000 And after comprehensive research we have chosen C3D. 03:55.000 --> 04:12.000 You know changing the geometric core for FEA package is a huge project, it took lots of efforts, and we are thankful to C3D team for reliable technical support during this process. 04:14.000 --> 04:36.000 Finally in April 2019 we released QuickField 6.4 - first version based on the C3D geometric core, which allowed to import of arbitrary multibody 3D geometry models from all major CAD systems. 04:39.000 --> 04:47.000 Dr. Allen had a complicated project he worked on, which required 3D electric analysis. 04:48.000 --> 05:01.000 His work resulted in successful design of high-voltage switch called, and in his publication he refers to QuickField 3D as an important tool for designing the electrodes for this device. 05:02.000 --> 05:12.000 Courtesy of Dr. Allen and Naval Research Laboratory we are allowed to demonstrate the model files and show you want exactly did they do in this project. 05:15.000 --> 05:30.000 The idea was to replace conventional oil switch with the water switch. Water has very high dielectric permittivity and fire safety. 05:31.000 --> 05:43.000 Switch consists of two groups of electrodes: grounded downstream electrode and a high voltage upstream electrode. 05:43.000 --> 05:52.000 There is also a shielding disc used to deduce the capacitance between the electrodes. 05:52.000 --> 05:59.000 The task was to calculate electric field stress distribution and find the capacitance between electrodes. 06:00.000 --> 06:12.000 The capacitance is critical, because the larger the capacitance the more energy is accumulated and should be dissipated during the switching process. 06:12.000 --> 06:19.000 Okay, let's start QuickField and see the model, created by Dr. Allen. 06:21.000 --> 06:34.000 Here is QuickField 6.4. I create new problem and the problem name is switch. Next. 06:34.000 --> 06:47.000 Problem type is Electrostatics, length units are millimeters, and the model class is a 3D import. Finish. 06:49.000 --> 06:54.000 Here you should import the model from the CAD system using the STEP-file import. 06:56.000 --> 07:03.000 Okey, here is the file. Open. 07:04.000 --> 07:09.000 You can see the switch armature. 07:10.000 --> 07:16.000 Here is the outer body. 07:17.000 --> 07:19.000 Hide. 07:24.000 --> 07:34.000 This is the upstream electrode. 07:35.000 --> 07:36.000 Hide. 07:37.000 --> 07:47.000 This is the downstream electrode. 07:48.000 --> 07:54.000 And this is the shielding disc. 07:58.000 --> 08:08.000 All these are conducting elements. So I do not specify electric permittivity here. 08:08.000 --> 08:13.000 Instead I should specify electric potential on conductors' faces. 08:13.000 --> 08:16.000 Hide all but this. 08:18.000 --> 08:27.000 So this is conductor upstream electrode has high voltage potential. 08:28.000 --> 08:33.000 And the electric potential is 4 MV. 08:33.000 --> 08:40.000 Okay, unhide all. And hide the upstream electrode. 08:41.000 --> 08:57.000 All these electrodes are grounded. And I assign zero potential on their faces. 08:59.000 --> 09:06.000 Now you see I have 2 electrodes: high voltage and grounded. 09:09.000 --> 09:15.000 And I need to add water because the switch is immerged in the water. 09:15.000 --> 09:24.000 Enable the background region. Click here and this would be the water. 09:25.000 --> 09:31.000 And for the water I specify dielectric permittivity of 81. 09:33.000 --> 09:41.000 And the geometry model now is ready. That is that fast thanks to C3D toolkit. 09:49.000 --> 09:54.000 The last thing before I can run the analysis is to build the finite element mesh. 09:54.000 --> 09:58.000 First I build the mesh on edges. 09:59.000 --> 10:03.000 Then I build the mesh on faces. 10:03.000 --> 10:15.000 It will take some minutes to build the finite element mesh in volumes. So I better switch to the already simulated problem. 10:15.000 --> 10:25.000 Here you can see the results. Here is the electric potential distribution on the water faces. 10:25.000 --> 10:29.000 You can use the cut-by-plane tool to look inside. 10:29.000 --> 10:33.000 I will change the direction of the cut plane. 10:40.000 --> 10:43.000 I will open the 2D cross-section window. 10:43.000 --> 10:50.000 I can adjust the field picture and switch on the display of electric field strength. 10:53.000 --> 11:00.000 I can click any point and get the exact value of electric potential and electric field strength. 11:01.000 --> 11:22.000 And I can use the contour tool: click here, drag and click here, to get the field distribution on the XY-plot or in the table 11:23.000 --> 11:29.000 This way electric field stress values were calculated 11:30.000 --> 11:48.000 And here I will hide the water block. Here you can click to select a body and calculate the integrals. I would like to calculate the electric charge. 11:49.000 --> 11:53.000 And if I divide the electric charge by the potential difference, I will get the capacitance value. 11:54.000 --> 12:03.000 As you see – this is very complicated electromagnetic device. 12:03.000 --> 12:11.000 To optimize the shape of electrodes and calculate electric stresses it is critical to use 3D analysis. 12:12.000 --> 12:23.000 And thanks to using C3D core QuickField software became a reliable tool, used by leading researchers for designing such kind of equipment. 12:24.000 --> 12:37.000 This model is published on our website and may be analyzed using free Student Edition of QuickField. 12:37.000 --> 12:41.000 Okay, that's all. Thank you for your attention.