WEBVTT 00:00.660 --> 00:01.420 Hello everyone. 00:02.220 --> 00:07.260 So in the last video I showed how to create the geometry and the material. 00:07.980 --> 00:15.430 So let me delete this because it is not important in our case to delete the spear. 00:15.610 --> 00:16.910 Totally cool B lol. 00:16.920 --> 00:18.300 I have admittance return is copper. 00:18.400 --> 00:18.950 OK. 00:19.140 --> 00:22.360 Now let's talk about mashing. 00:22.530 --> 00:25.800 Let's go to mash physics control mash. 00:25.800 --> 00:29.410 You can uh fine fine. 00:29.820 --> 00:39.420 You see I have a MASH which has been created to do this simulation and I can select extra fine billion. 00:39.530 --> 00:40.270 It will be big. 00:40.790 --> 00:42.310 Now what is missing. 00:42.620 --> 00:43.870 Let me talk about it. 00:44.090 --> 00:50.820 For example I have a square a square sheet of copper. 00:50.850 --> 00:53.440 OK a three dimensional squared. 00:53.500 --> 01:07.710 Now I have three hundred degrees heat source at one side and zero degree at the other end maybe a small 01:07.710 --> 01:11.080 region it having a contact of zero degrees. 01:11.310 --> 01:21.540 Now if I ask you at the equal to zero point zero three seconds how will the heat provide look in this 01:23.090 --> 01:24.180 upper sheet. 01:24.450 --> 01:29.580 So the way to solve it is you have a differential equation the heat equation you set up the boundary 01:29.580 --> 01:31.160 condition that at equal to zero. 01:31.170 --> 01:33.030 This is 300 degrees Celsius. 01:33.090 --> 01:36.090 This small region is zero degrees Celsius. 01:36.090 --> 01:41.070 And you try to solve this problem and rest of the edges are at room temperature. 01:41.300 --> 01:42.470 Okay. 01:42.930 --> 01:44.100 So how do you solve this. 01:44.500 --> 01:48.870 You divide the 3D model into small parts. 01:48.890 --> 01:49.820 Okay. 01:49.840 --> 01:59.550 And in each small part you solve our differential equation and then you integrate over the whole region. 01:59.550 --> 02:01.560 This is how you solve a problem right. 02:01.560 --> 02:08.660 Because integration is basically a integral of a small derivative right. 02:08.690 --> 02:15.600 When you do integration of sine X X the X is a small region on which you are integrating. 02:15.650 --> 02:20.840 So we now have when we have our differential for example a squared row equal to zero or something like 02:20.840 --> 02:21.440 that. 02:21.470 --> 02:27.420 Basically this is a differential equation which we are solving in a particular region. 02:27.590 --> 02:38.240 So if you zoom in to this region what will happen is that I have set a boundary condition across the 02:38.630 --> 02:39.660 edges. 02:39.710 --> 02:43.370 Now the software will solve our differential equation in each domain. 02:45.080 --> 02:49.580 And then give a solution which solution will be used to calculate the solution in other domain. 02:49.610 --> 02:52.010 And so on. 02:52.010 --> 02:56.380 Okay so this is how the software works. 02:56.640 --> 02:57.890 Now define anti mesh. 02:57.890 --> 03:04.840 The better result you can expect also depends on various other factors also which I would not cover 03:04.880 --> 03:10.430 in this basic course but is how things work now in meshing. 03:10.430 --> 03:13.110 You can choose user controlled machine also. 03:13.650 --> 03:19.430 Now when I go to mash I go to modify and click on distribution. 03:19.430 --> 03:21.340 You can explore other options also. 03:21.710 --> 03:24.830 And I chose um edge. 03:25.970 --> 03:28.040 Let's say I chose this edge. 03:28.050 --> 03:28.870 Okay. 03:28.970 --> 03:34.410 And I tell that I need 15 elements in this age. 03:34.520 --> 03:42.310 And when I click on b all you see I have the region with a smaller mesh. 03:42.330 --> 03:46.840 Now if I go to 50 you see it is more visible. 03:46.910 --> 03:56.210 If I zoom in you see there are fifty elements in this age. 03:56.300 --> 03:59.250 You can see that this region is having a greater element. 03:59.250 --> 04:03.680 Now if you're working with an object for example you have a needle. 04:03.940 --> 04:04.840 Okay. 04:04.850 --> 04:06.970 One the one party circular and other side. 04:06.980 --> 04:08.090 We have a pointy end. 04:08.540 --> 04:11.840 No dissimilar this region where there is a slight edge. 04:11.840 --> 04:13.720 We need to have a finer mesh. 04:13.910 --> 04:23.020 Otherwise you will get errors because the sharper edge will be very sensitive to the boundary conditions. 04:23.030 --> 04:25.790 Hence we need to create smaller mesh. 04:25.790 --> 04:30.320 This is the basic principle of working with mesh. 04:30.360 --> 04:33.710 Now I'll go to physics control fine below. 04:33.770 --> 04:35.380 So this is totally cool. 04:35.440 --> 04:44.920 Now okay so I hope that you have understood how mesh actually works. 04:45.030 --> 04:54.650 So in my next video I'll explain you the how to add physics in a simulation. 04:54.660 --> 04:58.270 Okay so just to recap we created a document. 04:58.290 --> 05:03.810 We created a 3D component in it and then we created a geometry. 05:04.020 --> 05:06.300 We need to tell the software what the software need to do. 05:06.330 --> 05:07.580 So we have the software. 05:07.730 --> 05:11.580 I am creating a geometry and I will solve the physics in this geometry. 05:11.730 --> 05:15.770 We created a cylinder of radius one centimeter and height 10 centimeters. 05:15.780 --> 05:22.020 We added a material of copper in the model and then we created a mesh. 05:22.110 --> 05:26.700 Basically the software will solve the differential equations in this mass structure. 05:27.000 --> 05:34.230 Okay so in my next lecture I will add the physics and I can explain how to add the boundary conditions. 05:34.230 --> 05:34.620 Thank you.