Difference between revisions of "OpenFOAM/C3/Flow-over-a-flat-plate/English-timed"

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|Then go to the '''Run''' '''directory'''. You will see '''Tutorials. ''' Click on it.  
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|Then go to the 'run' directory. You will see 'Tutorials'. Click on it.  
 
Scroll down and then click on '''Incompressible.''' Scroll down.  
 
Scroll down and then click on '''Incompressible.''' Scroll down.  
  
 
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|You will see the '''simpleFoam '''folder. Click on it. This '''solver''' suits our case.
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|You will see the 'simpleFoam' folder. Click on it. This '''solver''' suits our case.
  
 
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| This is the '''velocity contour'''. '''Toggle''' on the '''Color legend'''.
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| This is the '''velocity contour'''. Toggle on the '''Color legend'''.
  
 
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|'''Scroll down''' and click on '''Rescale''' '''to data range'''.
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|'''Scroll down''' and click on '''Rescale''' to data range.
  
 
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| Let me shift this '''Color legend''' on top to visualize the '''Vector Plot'''. Go to the '''Filters''' Menu > '''Common''' > '''glyph'''.
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| Let me shift this '''Color legend''' on top to visualize the '''Vector Plot'''. Go to the '''Filters''' Menu > '''Common''' > '''Glyph'''.
  
 
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| Click '''Apply''' on the left hand side of '''Object Inspector''' Menu.
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| Click '''Apply''' on the left hand side of '''Object Inspector''' menu.
  
 
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| Also, the size of the '''vectors''' can be changed by clicking on the '''Edit''' button. The '''set scale''' '''factor''' can be changed to '''0.1'''
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| Also, the size of the '''vectors''' can be changed by clicking on the '''Edit''' button. The '''Set Scale Factor''' can be changed to 0.1.
  
 
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| To do this, in the '''Active Variable Control '''menu, click on '''zoomToBox '''option.
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| To do this, in the '''Active Variable Control '''menu, click on '''zoom To Box '''option
  
 
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| And '''zoom''' over any area that you desire.
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| and '''zoom''' over any area that you desire.
  
 
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| We can see the '''parabolic''' variation of '''vector plot '''as the '''flow''' moves over the''' plate'''.
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| We can see the parabolic variation of the '''vector plots '''as the '''flow''' moves over the''' plate'''.
  
 
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| Also, we can see that the color near to 1 corresponds to the '''velocity''' of '''0.99 '''times the '''free stream velocity'''.
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| Also, we can see that the color near to 1 corresponds to the velocity of 0.99 times the '''free stream velocity'''.
  
 
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| You can also plot the variation of velocity along the X and Y axes using the '''plot data over line'''.
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| You can also plot the variation of velocity along the X and Y axes using the '''plot over data line'''.
  
 
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|More information on this mission is available at this URL: http://spoken-tutorial.org/NMEICT-Intro.
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|More information on this mission is available at this URL:
 +
http://spoken-tutorial.org/NMEICT-Intro.
 
This is Rahul Joshi from '''IIT Bombay''', signing off.
 
This is Rahul Joshi from '''IIT Bombay''', signing off.
 
Thanks for joining.
 
Thanks for joining.
  
 
|}
 
|}

Revision as of 12:41, 30 June 2016

Time Narration
00:01 Hello and welcome to the spoken tutorial on Flow over a flat plate using OpenFOAM.
00:06 In this tutorial, I will teach you about:
  • Geometry of the flat plate
  • Changing the grid spacing in meshing
  • Postprocessing results in ParaView and
  • Visualizing using Vector Plot.
00:19 To record this tutorial, I am using:
  • Linux Operating system Ubuntu version 12.04.
  • OpenFOAM version 2.1.1 and
  • ParaView version 3.12.0
00:30 Flow over flat plate is a fundamental problem in fluid mechanics.
00:35 We can visualize the growth of the boundary layer. Boundary layer is a very thin region above the body
00:41 where the velocity is 0.99 times the free stream velocity.
00:46 This is a diagram of flow over the flat plate.
00:49 The boundary conditions are given as follows.

You have the Inlet, the Plate, Top – which is the Farfield and Outlet – which is the pressure outlet boundary.

01:00 The Free stream velocity U = 1 m/s and we are solving this for Reynolds number (Re) = 100.
01:08 Now let us go to the home folder. In the home folder, click on the OpenFoam folder.
01:15 Then go to the 'run' directory. You will see 'Tutorials'. Click on it.

Scroll down and then click on Incompressible. Scroll down.

01:27 You will see the 'simpleFoam' folder. Click on it. This solver suits our case.
01:34 In this, create a folder by the name flatplate. Right click - Create New Folder - flatplate.
01:44 Now, let's open the pitzdaily case.
01:47 Let me zoom this. Copy the three folders - 0, constant and system. Copy this.
01:56 Now let us go one level back. Paste these three folders inside the flatplate folder.
02:05 Open the constant folder and then the polyMesh folder.
02:10 Change the geometry and boundary condition names in the blockMeshDict file.
02:15 I have already made the changes. Let us open the blockMeshDict file . Scroll down. The geometry is in meters.
02:25 We have set the dimensions of the flatplate.
02:29 We can see the simpleGrading. It is kept as (1 3 1) as we need a finer mesh near the plate.
02:35 Now close this. Go two levels back.
02:41 Similarly, make changes in the boundary condition names inside the files in the '0' folder.
02:48 These files have pressure, velocity and wall functions.
02:54 To calculate the values of wall functions, please refer to the earlier tutorial in the OpenFoam series. Let us go one level back.
03:03 The system folder can be kept default. Let us close this.
03:09 Now let us open the terminal window. In the terminal window, type "run" and press Enter.
03:16 Type cd space tutorials press Enter.
03:21 Type cd incompressible press Enter.
03:25 Type cd space simpleFoam press Enter.
03:31 Now type "ls" and press Enter.
03:34 We can see the flatplate folder.
03:37 Now, type cd space flatplate and press Enter.
03:42 Now type "ls" and press Enter.
03:45 You can see the three folders 0, constant and system.
03:49 Now, we will mesh the geometry. We are using a course mesh for this problem. Meshing can be done by typing blockMesh in the terminal.
03:58 Press Enter. Meshing has been done.
04:01 Note that if there is some error in the blockMesh file, it will be shown in the terminal window.
04:07 To view the geometry, type “paraFoam”, press Enter.
04:13 After the ParaView window opens, on the left hand side of the object inspector menu, click Apply.
04:21 We can see the geometry. Close the ParaView window. Let me switch back to the slides.
04:28 The solver we are using here is simpleFoam. SimpleFoam is a steady state solver for in compressible and turbulent flows.
04:37 Let me switch back to the terminal window. In the terminal window, type "simpleFoam" and press Enter.
04:45 You will see the iterations running in the terminal window.
04:51 Once the solving is done, type "paraFoam" to view the results.
04:55 On the left hand side of the Object Inspector menu, click Apply to view the geometry.
05:01 Scroll down the properties panel of the Object Inspector menu for time step, regions and fields.
05:08 To view the contours from the top drop down menu, in the Active Variable Control menu, change from solid color to capital 'U'.
05:19 You can see the initial condition of the velocity.
05:23 Now on top of the ParaView window, you will see the VCR control.
05:28 Click on the Play button.
05:33 You will see the contour of Pressure or Velocity on the flat plate accordingly.
05:39 This is the velocity contour. Toggle on the Color legend.
05:43 To do this, click on the color legend icon on the Active Variable Control menu.
05:50 Click Apply in the Object inspector menu.
05:53 In the Object inspector menu, click on Display.
05:57 Scroll down and click on Rescale to data range.
06:03 Let me shift this Color legend on top to visualize the Vector Plot. Go to the Filters Menu > Common > Glyph.
06:15 Go to the Properties in Object Inspector menu.
06:20 Click Apply on the left hand side of Object Inspector menu.
06:24 You can change the number of vectors by changing their size at the bottom.
06:29 Also, the size of the vectors can be changed by clicking on the Edit button. The Set Scale Factor can be changed to 0.1.
06:41 Again, click the Apply button.
06:44 Now let me zoom this.
06:46 To do this, in the Active Variable Control menu, click on zoom To Box option
06:52 and zoom over any area that you desire.
06:58 We can see the parabolic variation of the vector plots as the flow moves over the plate.
07:04 Delete this. Now delete the vector plot.
07:09 Also, we can see that the color near to 1 corresponds to the velocity of 0.99 times the free stream velocity.
07:17 You can also plot the variation of velocity along the X and Y axes using the plot over data line.
07:26 This brings us to the end of the tutorial. In this tutorial, we learnt:
  • Geometry and meshing of the flat plate geometry and
  • Vector plotting in ParaView.
07:37 As an Assignment-

Create a geometry of flow over a flat plate. Refine the grid spacing near the plate.

07:45 Watch the video available at this URL: http://spoken-tutorial.org/What_is_a_Spoken_Tutorial

It summarizes the Spoken Tutorial project. If you do not have good bandwidth, you can download and watch it.

07:55 The Spoken Tutorial Project team:
  • Conducts workshops using spoken tutorials.
  • Gives certificates to those who pass an online test.

For more details, please write to: contact@spoken-tutorial.org

08:08 Spoken Tutorial project is a part of the Talk to a Teacher project. It is supported by the National Mission on Education through ICT, MHRD, Government of India.
08:17 More information on this mission is available at this URL:

http://spoken-tutorial.org/NMEICT-Intro. This is Rahul Joshi from IIT Bombay, signing off. Thanks for joining.

Contributors and Content Editors

DeepaVedartham, PoojaMoolya, Pratik kamble, Sandhya.np14

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