Difference between revisions of "OpenFOAM/C3/Installing-and-running-Gmsh/English-timed"
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| 03:03 | | 03:03 | ||
− | | Let me switch back to '''Gmsh'''.On the left hand side, you can see the '''module tree''' with '''Geometry, Mesh''' and '''Solver'''. | + | | Let me switch back to '''Gmsh'''. On the left hand side, you can see the '''module tree''' with '''Geometry, Mesh''' and '''Solver'''. |
|- | |- | ||
| 03:14 | | 03:14 | ||
− | | Go to '''Geometry | + | | Go to '''Geometry >> Elementary entities'''. Click on '''Add'''. Click on '''Point. '''A new '''window''' will appear. |
|- | |- | ||
| 03:25 | | 03:25 | ||
− | | Enter the | + | | Enter the X, Y and Z coordinates starting with (0 0 0) and press '''Enter'''. |
|- | |- | ||
| 03:34 | | 03:34 | ||
− | | Enter the second coordinate as (1 0 0) and press '''Enter | + | | Enter the second coordinate as (1 0 0) and press '''Enter''', third coordinate as (1 1 0) and press '''Enter''', fourth coordinate as (0 1 0) and press '''Enter'''. |
|- | |- | ||
|03:53 | |03:53 | ||
− | |Similarly, | + | |Similarly, add the coordinates for the positive z-direction starting with point (0 0 1) and press '''Enter'''. Enter the remaining three coordinates and close the window. |
|- | |- | ||
| 04:10 | | 04:10 | ||
− | | I have entered all the eight coordinates. Use the left mouse click to move the points. | + | | I have entered all the eight coordinates. Use the left '''mouse''' click to move the points. |
|- | |- | ||
| 04:18 | | 04:18 | ||
− | | You can see all the 8 | + | | You can see all the 8 coordinates as points. |
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| 04:23 | | 04:23 | ||
− | | Now, click on '''Straight line'''. It will ask for a '''start point '''.Select the first point. | + | | Now, click on '''Straight line'''. It will ask for a '''start point'''. Select the first point. |
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| 04:33 | | 04:33 | ||
− | | It will ask for '''end point '''.Select the end point. | + | | It will ask for an '''end point'''. Select the end point. |
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| 04:37 | | 04:37 | ||
− | | A line will be drawn between the two points.Similarly, join all the points. | + | | A line will be drawn between the two points. Similarly, join all the points. |
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| 04:45 | | 04:45 | ||
− | | Press | + | | Press 'q' to '''abort'''. |
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| 04:49 | | 04:49 | ||
− | | Now we will define the faces of the cube.Click on | + | | Now, we will define the faces of the cube. Click on '''plane surface'''. It will ask for the '''surface boundary'''. |
|- | |- | ||
| 04:59 | | 04:59 | ||
− | | Select the edges of the bottom face first.You will notice that the edge we select, turns red in color. | + | | Select the edges of the bottom face first. You will notice that the edge we select, turns red in color. |
|- | |- | ||
| 05:08 | | 05:08 | ||
− | |It will ask for '''hole''' boundaries, if any.Since we do not have any '''hole''' in the boundary, press | + | |It will ask for '''hole''' boundaries, if any. Since we do not have any '''hole''' in the boundary, press 'e' to end the selection. |
|- | |- | ||
| 05:19 | | 05:19 | ||
− | | You will notice that | + | | You will notice that the face will appear with dashed centre lines. Now define the '''top face'''. |
|- | |- | ||
| 05:29 | | 05:29 | ||
− | | Similarly, define the remaining faces.I have defined all the faces. Press | + | | Similarly, define the remaining faces. I have defined all the faces. Press 'q' to abort. |
|- | |- | ||
| 05:39 | | 05:39 | ||
− | | Now, we will define the volume of the cube.It will ask for the '''volume'''boundary. | + | | Now, we will define the volume of the cube. It will ask for the '''volume''' boundary. |
|- | |- | ||
| 05:47 | | 05:47 | ||
− | | Select any of the surface boundary and press | + | | Select any of the surface boundary and press 'e' to end selection. |
|- | |- | ||
| 05:55 | | 05:55 | ||
− | | A yellow dot appears at the centre of the cube | + | | A yellow dot appears at the centre of the cube which represents the volume. Press '''q''' to abort. |
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| 06:04 | | 06:04 | ||
− | | Now, we will define the physical groups | + | | Now, we will define the physical groups which will be used in exporting the geometry to '''OpenFOAM.''' |
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| 06:13 | | 06:13 | ||
− | | Go to '''Physical | + | | Go to '''Physical Groups >> Add''' and click on '''Surface.''' |
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| 06:19 | | 06:19 | ||
− | | Select the front surface first and press '''e''' to end the selection.Select the back surface and press '''e '''to end the selection. | + | | Select the front surface first and press '''e''' to end the selection. Select the back surface and press '''e '''to end the selection. |
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| 06:31 | | 06:31 | ||
− | | Similarly, select the remaining surfaces. I have selected all the surfaces. | + | | Similarly, select the remaining surfaces. I have selected all the surfaces. Press '''q''' to abort. |
|- | |- | ||
| 06:41 | | 06:41 | ||
− | | Now, we'll define the physical '''volume.'''Click on '''Volume.''' It will ask for volume.Click on the yellow dot at the centre of the cube. | + | | Now, we'll define the physical '''volume.''' Click on '''Volume.''' It will ask for volume. Click on the yellow dot at the centre of the cube. |
|- | |- | ||
| 06:53 | | 06:53 | ||
− | |The yellow dot will turn red in color. Press '''e '''to end selection. | + | |The yellow dot will turn red in color. Press '''e '''to end selection. Press '''q''' to abort. |
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| 07:07 | | 07:07 | ||
− | | Go to '''File | + | | Go to '''File >> Save as.''' We will name our file as '''cube.geo'''. |
|- | |- | ||
| 07:15 | | 07:15 | ||
− | |Note that here | + | |Note that here "geo" stands for '''geometry'''. Click '''Ok'''. Again click '''Ok'''. |
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| 07:23 | | 07:23 | ||
− | | This brings us to the end of this tutorial.As an | + | | This brings us to the end of this tutorial. As an assignment, create other simple geometry in '''Gmsh''' like cylinder, sphere. |
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| 07:35 | | 07:35 | ||
− | | In this tutorial | + | | In this tutorial We: |
− | * | + | * Learnt to install and run '''Gmsh''' using '''Synaptic Package Manager''' and website. |
* Created a cube using '''Gmsh'''. | * Created a cube using '''Gmsh'''. | ||
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|07:56 | |07:56 | ||
− | | We conduct workshops using spoken tutorials and give certificates Please contact us at this URL contact@spoken-tutorial. | + | | We conduct workshops using spoken tutorials and give certificates. Please contact us at this URL: |
+ | '''contact@spoken-tutorial.org''' | ||
+ | Spoken Tutorial is funded by NMEICT, MHRD, Government of India. | ||
|- | |- | ||
| 08:11 | | 08:11 | ||
− | | The script was created by Gautam Sharma and this is Rahul Joshi from IIT | + | | The script was created by Gautam Sharma and this is Rahul Joshi from '''IIT Bombay''', signing off. Thanks for joining. |
|} | |} |
Revision as of 16:25, 5 July 2016
Time | Narration |
00:01 | Hello and welcome to the spoken tutorial on Installing and running Gmsh. |
00:08 | In this tutorial, we will learn how to:
|
00:18 | As a prerequisite, the user should have basic knowledge about mesh. |
00:24 | To record this tutorial, I am using:
|
00:34 | Let me introduce you to Gmsh. Gmsh is an automatic 3-D finite element mesh generator with built-in pre and post-processing facilities.
It's an open-source software. |
00:51 | It is advantageous creating complex geometries in gmsh than blockmesh utility of OpenFOAM like blades, aerofoil.
OpenFOAM supports importing mesh from third party meshing software like Gmsh. |
01:08 | Let me show you how to install Gmsh.
Gmsh can be installed using Synaptic Package Manager. |
01:15 | Let me open Synaptic Package Manager for you. It will ask for your password. Type in your password. |
01:25 | In the search box, type "gmsh" and click on the checkbox in front of gmsh. And, click on Mark for installation. Click on Apply. |
01:40 | Again, click Apply. This might take some time. Your Gmsh is now installed. |
01:50 | Alternately, you can also download Gmsh from the Gmsh website. Let me open the browser for you. |
01:59 | In the address bar, type: http://geuz.org/gmsh/ and press Enter. |
02:09 | Scroll down to the Download and select the current stable release according to your operating system. I will select Linux 64-bit. Click on Save file and press OK. |
02:26 | After finishing your download, go to the Downloads folder. |
02:31 | Here you can see the tar file. Extract this file. A new folder will be created. |
02:41 | Open the folder. Go to bin and click on the gmsh icon. |
02:49 | You can see the Gmsh start screen. Now we will create a cube using Gmsh. |
02:57 | Here you can see the cube with sides equal to one unit. |
03:03 | Let me switch back to Gmsh. On the left hand side, you can see the module tree with Geometry, Mesh and Solver. |
03:14 | Go to Geometry >> Elementary entities. Click on Add. Click on Point. A new window will appear. |
03:25 | Enter the X, Y and Z coordinates starting with (0 0 0) and press Enter. |
03:34 | Enter the second coordinate as (1 0 0) and press Enter, third coordinate as (1 1 0) and press Enter, fourth coordinate as (0 1 0) and press Enter. |
03:53 | Similarly, add the coordinates for the positive z-direction starting with point (0 0 1) and press Enter. Enter the remaining three coordinates and close the window. |
04:10 | I have entered all the eight coordinates. Use the left mouse click to move the points. |
04:18 | You can see all the 8 coordinates as points. |
04:23 | Now, click on Straight line. It will ask for a start point. Select the first point. |
04:33 | It will ask for an end point. Select the end point. |
04:37 | A line will be drawn between the two points. Similarly, join all the points. |
04:45 | Press 'q' to abort. |
04:49 | Now, we will define the faces of the cube. Click on plane surface. It will ask for the surface boundary. |
04:59 | Select the edges of the bottom face first. You will notice that the edge we select, turns red in color. |
05:08 | It will ask for hole boundaries, if any. Since we do not have any hole in the boundary, press 'e' to end the selection. |
05:19 | You will notice that the face will appear with dashed centre lines. Now define the top face. |
05:29 | Similarly, define the remaining faces. I have defined all the faces. Press 'q' to abort. |
05:39 | Now, we will define the volume of the cube. It will ask for the volume boundary. |
05:47 | Select any of the surface boundary and press 'e' to end selection. |
05:55 | A yellow dot appears at the centre of the cube which represents the volume. Press q to abort. |
06:04 | Now, we will define the physical groups which will be used in exporting the geometry to OpenFOAM. |
06:13 | Go to Physical Groups >> Add and click on Surface. |
06:19 | Select the front surface first and press e to end the selection. Select the back surface and press e to end the selection. |
06:31 | Similarly, select the remaining surfaces. I have selected all the surfaces. Press q to abort. |
06:41 | Now, we'll define the physical volume. Click on Volume. It will ask for volume. Click on the yellow dot at the centre of the cube. |
06:53 | The yellow dot will turn red in color. Press e to end selection. Press q to abort. |
07:02 | Our cube is complete. Let us save our work. |
07:07 | Go to File >> Save as. We will name our file as cube.geo. |
07:15 | Note that here "geo" stands for geometry. Click Ok. Again click Ok. |
07:23 | This brings us to the end of this tutorial. As an assignment, create other simple geometry in Gmsh like cylinder, sphere. |
07:35 | In this tutorial We:
|
07:48 | This video summarizes the Spoken Tutorial project. If you do not have good bandwidth, you can download and watch it. |
07:56 | We conduct workshops using spoken tutorials and give certificates. Please contact us at this URL:
contact@spoken-tutorial.org Spoken Tutorial is funded by NMEICT, MHRD, Government of India. |
08:11 | The script was created by Gautam Sharma and this is Rahul Joshi from IIT Bombay, signing off. Thanks for joining. |