Difference between revisions of "OpenFOAM/C2/2D-Laminar-Flow-in-a-channel/English"
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− | | style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Hello and welcome to the spoken tutorial on '''Simulating Laminar Flow in a Channel using openfoam''' | + | | style="border-top:none;border-bottom:0.05pt solid #000000;border-left:0.05pt solid #000000;border-right:0.05pt solid #000000;padding:0.097cm;"| Hello and welcome to the spoken tutorial on '''Simulating 2D Laminar Flow in a Channel using openfoam''' |
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Revision as of 11:33, 30 May 2019
Tutorial: Simulating Laminar flow in a channel.
Script and Narration : Rahul Joshi
Keywords: Video tutorial,CFD,laminar flow,simpleFoam,channel
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Slide 1 | Hello and welcome to the spoken tutorial on Simulating 2D Laminar Flow in a Channel using openfoam |
Slide 2 : Learning Objectives | In this tutorial I will show you
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Slide 3 : System requirement | To record this tutorial
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Slide 4 : System Requirement
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Slide 5 : Pre-requisite | You should know how to create geometry using OpenFOAM
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Slide 6 : About flow in a channel |
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Slide 7 : Channel Flow | Channel flow problem description. |
Slide 7 : Channel flow | The boundary names and inlet conditions are shown in this figure |
Slide 8 : Boundary Conditions | The flow develpoment length is given by the formula
L = 0.05 * Re * D |
Slide 8 : Boundary Conditions | Re which is the Reynolds number
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Slide 8 : Boundary Conditions | Using the formula length of the channel comes out to be 5 meters
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Slide 9 : File structure | This is a steady state problem
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Create a floder and name it as channel in simpleFoam folder
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I have already created a folder in
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Nmae the folder channel | The folder is named as channel
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copy 0,constant and system from pitzDaily to this channel folder | Copy 0,Constant and System folders of any other case file in the simpleFoam directory |
I have copied the file structure of case of pitzDaily | |
Paste it in the channel folder and
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Now let me open the command terminal | |
Press Ctrl+Alt+t keys simultaneously | To do this press Ctrl+Alt +t keys simultaneously on your keyboard
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run and press enter | In the terminal
Type run and press enter |
now type cd space tutorials and press enter | |
incompressible and press enter | now type cd space incompressible and press enter |
simpleFoam and press enter | type cd space simpleFoam and press enter |
channel and press enter | now type cd channel and press enter |
ls and press enter | now type ls and press enter |
You will see three folders 0 , Constant and System | |
Type in command terminal
cd constant and press enter |
now type cd constant and press enter |
ls and press enter | now type ls and press enter |
polymesh folder and 2 other files | In this you will see files containing
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gedit RASProperties and press enter | RASProperties contains Reynolds-averaged stress model |
Transportproperties | transportProperties contain the transport model
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cd polyMesh and press enter | Now in the terminal type cd polyMesh and press enter |
ls and press enter | Now type ls and press enter |
you will see the blockMeshDict file here | |
gedit blockMeshDict and press enter | To open the blockMeshDict file in the
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In the blockMeshDict file covertTometers is set to 1
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The geomery is in meters so the convertTometers is set to 1
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Mesh size for channel | We have used a 100 X 100 mesh size here and cell spacing is kept as ( 1 1 1 ) |
Boundary conditions and types | Next we have set up boundary conditions and their types which are set as inlet ,outlet,top and bottom
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FrontAndBack boundary type as empty | As this is a 2D geometry frontAndBack is kept as empty |
Due to a 2 dimensional geometry | Also this being a simple geometry
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Terminal window | In the command terminal Type cd space ..(dot dot) and press enter |
Terminal window | Again type cd space .. (dot dot) and press enter |
In the terninal window type cd 0
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Now in the terminal type cd space 0 (Zero) and press enter
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In terminal you can see these slides | This contains the intial boundary conditions
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Wall functions : epsilon, k, nut, nutilda
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It should contain various files such as
Now let me switch back to the slides |
Slide 10 : Calculate K. | Calculate k which is the turbulent kinetic energy
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Slide 11 : Calculate epsilon
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Calculate epsilon from the formula given
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Change only the boundary names | Change only the boundary names in each of the above files |
Do not chnge the values of nu,nuTilde and R | Note that the values of nut, nuTilda and R
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Rest of the files should contain initial value
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In the terminal window type cd .. and press enter | Now in the terminal Type cd (space) ..(dot dot) and press enter |
No change in system folder | There is no change to be done in the system folder |
Mesh the geometry
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Now, We need to mesh the geometry
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Slide 12 : Solver | The type of solver we are using here is simpleFoam
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Type simpleFoam and press enter | In the command terminal type simpleFoam and Press enter |
Iterations in terminal window | Iterations running will be seen in the command terminal |
Iterations running may take some time | |
Iterations converge or stop at end of time step | The iterations will stop once the solution is
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In terminal
type: paraFoam and press enter |
To view the results in paraview in the terminal
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In paraview window
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On let hand side of the paraview window click Apply
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Change from solid color to U | On top of active variable control menu change
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Look at left side of the channel geometry | You can see the initial state of velocity magnitude at inlet. |
VCR control click PLAY button | On top of the paraview window click on the
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Color legend from top left | Also toggle on the color legend from the
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In object inspector menu
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Now go to display
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Check the color legend for this | We can see that once the flow has fully devloped
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Slide 13 :Validation | The results obtained can be validated with
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Slide 14 : Summary | In this tutorial we learnt
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Slide 15 :
Assignment |
As an assignment:
Solve the problem for Reynold Number 1500 and validate it with the analytical result |
Slide 16 : About the Spoken Tutorial Project | 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. |
Slide 17 : Spoken Tutorial Workshops | 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 |
Slide 18 :
Forum to answer questions
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Slide 19 :
Forum to answer questions
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Slide 20 :
Lab Migration Project
For more details visit this site: http://cfd.fossee.in/ |
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Slide 21:
Case Study Project
For more details visit this site: http://cfd.fossee.in/ |
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Slide 22 :
Acknowledgement
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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. More information on the same is available at the following URL http://spoken-tutorial.org/NMEICT-Intro |
About the contributor | This is Rahul Joshi from IIT BOMBAY signing off.
Thanks for joining |