OpenFOAM/C2/2D-Laminar-Flow-in-a-channel/English-timed - Revision history

DeepaVedartham at 09:30, 11 April 2019

2019-04-11T09:30:39Z

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PoojaMoolya at 06:18, 4 October 2017

2017-10-04T06:18:15Z

PoojaMoolya at 05:21, 24 March 2017

2017-03-24T05:21:50Z

PoojaMoolya at 09:59, 10 March 2017

2017-03-10T09:59:38Z

PoojaMoolya at 09:59, 10 March 2017

2017-03-10T09:59:11Z

PoojaMoolya at 09:58, 10 March 2017

2017-03-10T09:58:32Z

Sandhya.np14 at 10:31, 27 June 2016

2016-06-27T10:31:11Z

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Sandhya.np14 at 07:36, 27 June 2016

2016-06-27T07:36:43Z

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Pratik kamble at 12:30, 7 December 2015

2015-12-07T12:30:29Z

Pratik kamble: Created page with "One line is said twice @08:35 {|border=1 | '''Time''' | '''Narration''' |- | 00:01 | Hello and welcome to the spoken tutorial on ''' Simulating 2D Laminar Flow in a Channel u..."

2015-12-07T12:25:45Z

Created page with "One line is said twice @08:35 {|border=1 | '''Time''' | '''Narration''' |- | 00:01 | Hello and welcome to the spoken tutorial on ''' Simulating 2D Laminar Flow in a Channel u..."

New page

One line is said twice @08:35
{|border=1
| '''Time'''
| '''Narration'''

|-
| 00:01
| Hello and welcome to the spoken tutorial on ''' Simulating 2D Laminar Flow in a Channel using openfoam'''

|-
| 00:09
| In this tutorial I will show you
'''2D geometry of channel '''
'''Meshing the Geometry'''
'''Solving''' and '''Post Processing results''' in '''Paraview''' and Validation using '''analytic result'''

|-
| 00:25
| To record this tutorial I am using '''Linux Operating system Ubuntu 12.04''' .
'''OpenFOAM version 2.1.1'''
'''ParaView version 3.12.0 '''

|-
| 00:39
|Note that '''OpenFOAM''' version '''2.1.1''' is supported on '''ubuntu version 12.04'''

|-
| 00:45
|Hence forth all the tutorials will be covered using '''OpenFOAM version 2.1.1''' and''' ubuntu version 12.04'''

|-
| 00:56
| As a Pre-requisite for this tutorial You should know how to create '''geometry''' using '''OpenFOAM'''

|-
| 01:03
|If not, please refer to the '''relevant tutorials''' on our '''website'''

|-
| 01:09
|we simulate flow in a channel to determine flow development length along the downstream '''Channel flow''' problem description

|-
| 01:19
| The '''boundary names''' and the '''inlet conditions''' are shown in this figure

|-
| 01:26
| The '''flow develpoment length''' is given by the formula '''L= 0.05 * Re * D'''

|-
| 01:32
| '''Re''' which is the '''Reynolds number''' and '''D''' which is the '''channel height'''

|-
| 01:37
| Using the '''formula''' length of the channel comes out to be '''5 meters '''and '''height''' is kept as '''1 meter'''.

|-
| 01:45
|The '''Inlet velocity is 1''' '''meters per second''' And we are solving this for a '''Reynolds number''' '''( Re ) equal 100'''

|-
| 01:53
| This is a '''steady state problem '''.Therefore we are using a '''steady state incompressible''' solver for this case

|-
| 02:01
| This is the file structure of our case the folder should be created in the solver type that we choose I have already created a '''folder''' in '''simpleFoam folder''' of''' incompressible flow solvers'''

|-
| 02:18
|The '''folder''' is named as''' channel'''Now let me switch to the '''folder'''

|-
| 02:25
| '''Copy 0,Constant and System''' '''folders''' of any other case file in the '''simpleFoam directory'''

|-
| 02:34
| I have copied the''' file structure''' of the case of''' pitzDaily'''

|-
| 02:38
| Paste it inside the channel folder and make the necessary changes in the '''geometry''','''boundary faces''' and '''boundary condition'''

|-
| 02:48
| Now let me '''open the command terminal'''

|-
| 02:51
| To do this press '''Ctrl+Alt +t''' keys simultaneously on your '''keyboard'''

|-
| 02:57
| In the terminal Type '''run and press enter'''

|-
| 03:01
| now type cd space '''tutorials and press enter'''

|-
| 03:08
| now type cd space '''incompressible and press enter'''

|-
| 03:15
| type cd space '''simpleFoam and press enter'''

|-
| 03:20
| now type cd '''channel and press enter'''

|-
| 03:28
| now type '''ls and press enter'''

|-
| 03:33
| You will see three folders '''0 , Constant and System'''

|-
| 03:37
| now type cd '''constant and press enter'''

|-
| 03:48
| now type '''ls and press enter'''

|-
| 03:52
| In this you will see '''files''' containing '''properties of fluid''' and a''' folder named polymesh'''

|-
| 03:59
| '''RASProperties''' contains '''Reynolds-averaged stress '''model

|-
|04:03
| '''transportProperties''' contain the '''transport model '''and '''kinematic viscosity that is (nu) in this case is set at 0.001 m²/s'''.

|-
| 04:17
| Now in terminal type '''cd polyMesh and press enter'''.Now type '''ls''' and press enter

|-
| 04:30
|You will see the '''blockMeshDict''' file here

|-
| 04:33
| To open up the '''blockMeshDict''' file in the terminal '''type gedit blockMeshDict and press enter'''Scroll down

|-
| 04:48
| The geomery is in '''meters '''so the '''convertTometers''' is set to 1 next we have''' defined''' the '''vertices of the channel '''

|-
| 04:59
| We have used a '''100 X 100''' mesh size here and '''cell spacing''' is kept as '''( 1 1 1 )'''

|-
| 05:07
| Next we have setup the '''boundary conditions''' and their types which are '''inlet ,outlet,top and bottom '''

|-
| 05:19
| As this is a '''2D Geometry front And Back''' are kept as '''empty'''

|-
| 05:27
| Also this being a '''simple geometry ''' '''mergePatchPair''' and '''edges''' are to be kept '''empty'''.Close the '''blockMeshDict''' file

|-
| 05:38
| In the '''command terminal''' Type '''cd space ..(dot dot) '''and press enter

|-
| 05:44
| Again type '''cd space .. (dot dot)''' and press enter

|-
| 05:49
| Now in the terminal type '''cd '''space '''0 (Zero) and press enter'''Now Type''' ls and press enter'''

|-
| 05:58
| This contains the '''intial boundary conditions ''' and''' wall functions''' for the '''channel case'''

|-
| 06:05
| It should contain various files such as '''epsilon ,k, nut,nuTilda ''' which are the '''wall functions'''and '''p , R and capital U'''
which the are '''initial conditions of the flow'''

|-
|06:20
|Let me switch back to the slides

|-
| 06:24
| '''Calculate k''' which is the '''turbulent kinetic energy''' from the '''formula''' given in the slide

|-
| 06:29
|Where '''Ux, Uy and Uz''' are the '''velocity''' '''components in the x, y and z direction''' And '''U' ( dash ) = 0.05''' times '''u''' actual

|-
| 06:43
| Calculate '''epsilon''' from the '''formula''' given Where '''epsilon''' is the''' rate of disspiation turbulent energy''' '''C mu''' is a '''constant''' and its value is''' 0.09'''

|-
| 06:56
|And''' l''' is the '''length of the channel''' Let me minimise this

|-
| 07:02
| Change only the '''boundary names''' in each of the above '''folder'''

|-
| 07:07
| Note that the values of '''nut, nuTilda and R ''' are to kept default

|-
|07:13
| Rest of the '''files''' should contain initial value for each of the '''boundary faces'''

|-
| 07:21
| Now in the terminal Type '''cd (space) ..(dot dot) and press enter'''

|-
| 07:27
| There are no change to be done in the '''system folder'''

|-
| 07:31
|Now We need to '''mesh the geometry''' To do this In the '''command terminal''' '''type blockMesh and press enter'''

|-
| 07:40
|'''Meshing''' is done.Now Let me switch back to the slide

|-
| 07:45
| The '''type of solver''' we are using here is '''SimpleFoam'''It is a '''Steady-state''' solver for '''incompressible, turbulent flow'''

|-
| 07:55
|let me minimise this

|-
| 07:56
| In the '''command terminal''' '''type simpleFoam and Press enter'''

|-
| 08:03
| '''Iterations running''' will be seen in the '''command terminal'''

|-
| 08:07
| '''Iterations '''running may take some time

|-
| 08:11
| The '''iterations''' will stop once the solution is '''converged''' or it reaches its '''end time value'''

|-
| 08:16
| To view the results in '''paraview''' in the '''terminal '''

|-
| 08:20
|type '''paraFoam and press enter'''.This will open up the '''paraview window'''

|-
| 08:28
| On let hand side of the '''paraview''' '''window''' click '''Apply'''.The '''geometry '''can be seen here.

|-
| 08:35
| On top of '''active variable control menu change '''the '''drop down menu''' from '''solid color to capital U'''

|-
| 08:50
| You can see the '''initial state''' of '''velocity magnitude''' at '''inlet.'''. On top of the '''paraview window''' click on the'''play''' '''button''' of the '''VCR control'''

|-
| 09:00
|you can see the final value of the '''velocity magnitude'''

|-
| 09:07
| Also''' toggle on''' the '''color legend''' from the left hand side top of '''active variable control menu''''''Click APPLY''' again

|-
| 09:16
| Now go to '''display'''Scroll down You can see '''Rescale''', click on it

|-
| 09:24
| We can see that once the '''flow has fully developed '''it attains a '''maximum uniform velocity''' at the '''center'''Now let me switch back to the slides

|-
| 09:36
| The results obtained can be '''validated '''with the '''analytical solution''' for '''laminar flow''' in a'''channel which is u(max)=1.5 Uavg'''

|-
| 09:46
|Using '''openfoam''' we obatain a '''velocity of 1.48 meters per second''' which is a good match.This brings us to the end of the tutorial

|-
| 09:57
| In this tutorial we learnt The '''File structure of channel '''
'''Obtained solution''' using '''steady state solver'''

Viewed the geometry in '''paraview ''''''Validation''' with '''analytic results'''

|-
| 10:08
| As an assignment
Solve the problem for '''Reynold Number 1500''' and

'''validate it with the analytical result'''

|-
| 10:17
| 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.

|-
| 10:28
| 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 [mailto:contact@spoken-tutorial.org contact@spoken-tutorial.org]

|-
| 10:42
| Spoken Tutorials are part of Talk to a Teacher project, It is supported by the National Mission on Education through ICT, MHRD, Government of India.

|-
| 10:52
|More information on the same is available at the following URL link http://spoken-tutorial.org/NMEICT-Intro

|-
| 10:57
| This is Rahul Joshi from IIT BOMBAY signing off.Thanks for joining

|}

@@ Line 45: / Line 45: @@
 |-
 | 01:26
-| The '''flow develpoment length''' is given by the formula '''L= 0.05 * Re * D'''.
+| The '''flow develpoment length''' is given by the formula '''L= 0.05 times Re' that is the '''Reynolds number''' and 'D' which is the '''channel height'''.
-−
-|-
-| 01:32
-| 'Re' which is the '''Reynolds number''' and 'D' which is the '''channel height'''.
 |-
@@ Line 188: / Line 184: @@
 |-
-| 06:05
+| 06:04
 | It should contain various files such as '''epsilon, k, nut, nuTilda ''' which are the '''wall functions'''and  'p' , 'R' and capital 'U' which  are '''initial conditions''' of the '''flow'''.
@@ Line 196: / Line 192: @@
 |-
-| 06:24
+| 06:23
 | Calculate 'k' which is the '''turbulent kinetic energy''' from the formula given in the slide
@@ Line 204: / Line 200: @@
 |-
-| 06:43
+| 06:42
 | Calculate '''epsilon''' from the formula given where epsilon is the''' rate of dissipation of turbulent  energy''', '''C mu''' is a '''constant''' and its value is 0.09.
@@ Line 216: / Line 212: @@
 |-
-| 07:07
+| 07:06
 | Note that the values of '''nut, nuTilda, R ''' are kept to default.
@@ Line 224: / Line 220: @@
 |-
-| 07:21
+| 07:20
 | Now, in the terminal, type '''cd (space) ..(dot dot)''' and press '''Enter'''.
@@ Line 244: / Line 240: @@
 |-
-| 07:55
+| 07:54
 |Let me minimize this. In the command terminal, type "simpleFoam" and press '''Enter'''.
@@ Line 256: / Line 252: @@
 |-
-| 08:11
+| 08:10
 | The '''iterations''' will stop once the solution is converged or it reaches its '''end time value'''.
 |-
 | 08:16
-| To view the results in '''paraView''', in the terminal,
+| To view the results in '''paraView''', in the terminal, type "paraFoam" and press '''Enter'''. This will open up the '''paraView''' window.
-−
-|-
-| 08:20
-|type "paraFoam" and press '''Enter'''. This will open up the '''paraView''' window.
 |-
@@ Line 276: / Line 268: @@
 |-
-| 08:50
+| 08:42
 | You can see the '''initial state''' of '''velocity magnitude''' at '''inlet.'''. On top of the '''paraView''' window, click on the'''play''' button of the '''VCR control'''.
 |-
-| 09:00
+| 08:53
-|you can see the final value of the '''velocity magnitude'''.
+|You can see the final value of the '''velocity magnitude'''.
 |-
-| 09:07
+| 08:59
 | Also toggle on the '''color legend''' from the left hand side top of '''active variable control''' menu, click '''APPLY''' again.
 |-
-| 09:16
+| 09:09
 | Now go to '''Display''', scroll down. You can see '''Rescale''', click on it.
 |-
-| 09:24
+| 09:17
 | We can see that once the '''flow''' has fully developed, it attains a maximum uniform velocity at the center. Now, let me switch back to the slides.
 |-
-| 09:36
+| 09:29
 | The results obtained can be validated with the analytical solution for '''laminar flow''' in a'''channel''' which is u(max)=1.5 Uavg.
 |-
-| 09:46
+| 09:39
 |Using '''openFoam''', we obtain a result of u(max) = 1.48 meters per second which is a good match. This brings us to the end of the tutorial.
 |-
-| 09:57
+| 09:50
 | In this tutorial, we learnt the file structure of '''channel''', obtained solution using '''steady state solver'''. Viewed the geometry in '''paraview ''' and '''validation''' with '''analytic results'''.
 |-
-| 10:08
+| 10:01
 | As an assignment- solve the problem for '''Reynold's Number equal to 1500''' and '''validate''' it with the analytical result.
 |-
-| 10:17
+| 10:10
 | Watch the video available at this URL:  http://spoken-tutorial.org/What_is_a_Spoken_Tutorial
@@ Line 318: / Line 310: @@
 |-
-| 10:28
+| 10:21
 | The Spoken Tutorial Project team: * Conducts workshops using spoken tutorials.
@@ Line 324: / Line 316: @@
 |-
-| 10:42
+| 10:35
-| '''Spoken Tutorials''' are part of '''Talk to a Teacher''' project. It is supported by the National Mission on Education through ICT, MHRD, Government of India.
+| '''Spoken Tutorials''' is a  part of '''Talk to a Teacher''' project. It is supported by the National Mission on Education through ICT, MHRD, Government of India.
 |-
-| 10:52
+| 10:45
-|More information on this mission   is available at the following URL link: http://spoken-tutorial.org/NMEICT-Intro
+|More information on this mission  is available at the following URL link: http://spoken-tutorial.org/NMEICT-Intro
 |-
-| 10:57
+| 10:50
 | This is Rahul Joshi from IIT Bombay, signing off. Thanks for joining.
 |}

@@ Line 14: / Line 14: @@
 | 00:25
 | To record this tutorial, I am using:
-  '''Linux Operating system Ubuntu''' version 12.04.
-  '''OpenFOAM''' version 2.1.1
+'''Linux Operating system Ubuntu''' version 12.04. '''OpenFOAM''' version 2.1.1
-  '''ParaView''' version 3.12.0
 |-
@@ Line 36: / Line 37: @@
 |-
 | 01:09
-|We simulate flow in a channel to determine flow development length along the downstream.
+|We simulate flow in a channel to determine flow development length along the downstream. '''Channel flow''' problem description.
 '''Channel flow''' problem description.
 |-
@@ Line 136: / Line 136: @@
 |-
-|04:03
+| 04:03
 | '''transportProperties''' contains the '''transport model '''and '''kinematic viscosity''' that is (nu), in this case is set at 0.01 m²/s.
@@ Line 220: / Line 220: @@
 |-
-|07:13
+| 07:13
 | Rest of the files should contain the initial value for each of the '''boundary faces'''.
@@ Line 245: / Line 245: @@
 |-
 | 07:55
-|Let me minimize this.
+|Let me minimize this. In the command terminal, type "simpleFoam" and press '''Enter'''.
-−
-|-
-| 07:56
-| In the command terminal, type "simpleFoam" and press '''Enter'''.
 |-
@@ Line 305: / Line 301: @@
 |-
 | 09:46
-|Using '''openFoam''', we obtain a result of u(max) = 1.48 meters per second which is a good match.
+|Using '''openFoam''', we obtain a result of u(max) = 1.48 meters per second which is a good match. This brings us to the end of the tutorial.
 This brings us to the end of the tutorial.
 |-
@@ Line 314: / Line 309: @@
 |-
 | 10:08
-| As an assignment-
+| As an assignment- solve the problem for '''Reynold's Number equal to 1500''' and '''validate''' it with the analytical result.
 solve the problem for '''Reynold's Number equal to 1500''' and '''validate''' it with the analytical result.
 |-
 | 10:17
-| Watch the video available at this URL:
+| Watch the video available at this URL:  http://spoken-tutorial.org/What_is_a_Spoken_Tutorial
-  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.
+It summarizes the Spoken Tutorial project. If you do not have good bandwidth, you can download and watch it.
 |-
 | 10:28
 | 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'''
+Gives certificates to those who pass an online test.  For more details, please write to: '''contact@spoken-tutorial.org'''
 |-
@@ Line 335: / Line 329: @@
 |-
 | 10:52
-|More information on this mission   is available at the following URL link:
+|More information on this mission   is available at the following URL link: http://spoken-tutorial.org/NMEICT-Intro
 http://spoken-tutorial.org/NMEICT-Intro
 |-

@@ Line 9: / Line 9: @@
 |-
 | 00:09
-| In this tutorial, I will show you- '''2D geometry''' of '''channel''' '''Meshing''' the '''Geometry''''''Solving''' and '''Post Processing results''' in   '''Paraview''' and '''Validation''' using '''analytic result'''.
+| In this tutorial, I will show you- '''2D geometry''' of '''channel''' '''Meshing''' the '''Geometry''' '''Solving''' and '''Post Processing results''' in   '''Paraview''' and '''Validation''' using '''analytic result'''.
 |-

@@ Line 9: / Line 9: @@
 |-
 | 00:09
-| In this tutorial, I will show you-
+| In this tutorial, I will show you- '''2D geometry''' of '''channel''' '''Meshing''' the '''Geometry''''''Solving''' and '''Post Processing results''' in   '''Paraview''' and '''Validation''' using '''analytic result'''.
-  '''2D geometry''' of '''channel'''
-  '''Meshing''' the '''Geometry'''
-  '''Solving''' and '''Post Processing results''' in '''Paraview''' and
-  '''Validation''' using '''analytic result'''.
 |-
@@ Line 20: / Line 16: @@
    '''Linux Operating system Ubuntu''' version 12.04.
    '''OpenFOAM''' version 2.1.1
- '''ParaView''' version 3.12.0
+  '''ParaView''' version 3.12.0
 |-

@@ Line 10: / Line 10: @@
 | 00:09
 | In this tutorial, I will show you-
-* '''2D geometry''' of '''channel'''
+  '''2D geometry''' of '''channel'''
-* '''Meshing''' the '''Geometry'''
+  '''Meshing''' the '''Geometry'''
-* '''Solving''' and '''Post Processing results''' in '''Paraview''' and
+  '''Solving''' and '''Post Processing results''' in '''Paraview''' and
-* '''Validation''' using '''analytic result'''.
+  '''Validation''' using '''analytic result'''.
 |-
 | 00:25
 | To record this tutorial, I am using:
-* '''Linux Operating system Ubuntu''' version 12.04.
+  '''Linux Operating system Ubuntu''' version 12.04.
-* '''OpenFOAM''' version 2.1.1
+  '''OpenFOAM''' version 2.1.1
-* '''ParaView''' version 3.12.0
+ '''ParaView''' version 3.12.0
 |-
@@ Line 324: / Line 324: @@
 | 10:17
 | Watch the video available at this URL:
-http://spoken-tutorial.org/What_is_a_Spoken_Tutorial
+  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.
+  It summarizes the Spoken Tutorial project. If you do not have good bandwidth, you can download and watch it.
 |-
 | 10:28
 | The Spoken Tutorial Project team: * Conducts workshops using spoken tutorials.
-* Gives certificates to those who pass an online test.
+  Gives certificates to those who pass an online test.
-For more details, please write to: '''contact@spoken-tutorial.org'''
+  For more details, please write to: '''contact@spoken-tutorial.org'''
 |-

← Older revision		Revision as of 12:30, 7 December 2015
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−	~~One line is said twice @08:35~~
	{\|border=1		{\|border=1
	\| '''Time'''		\| '''Time'''