Difference between revisions of "OpenFOAM/C3/Simulating-Hagen-Poiseuille-flow/English"
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| Go to folder 'constant' and then 'polyMesh' and open blockMeshDict file and show it. | | Go to folder 'constant' and then 'polyMesh' and open blockMeshDict file and show it. | ||
| − | | Let's go into the folder ''''constant',''' and then ''''polyMesh'.''' lets open the'''blockMeshDict ' file. | + | | Let's go into the folder ''''constant',''' and then ''''polyMesh'.''' lets open the'''blockMeshDict ' file. We can see the vertices, blocks,edges and boundaries for inlet, outlet and fixed wall. |
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Revision as of 12:36, 29 May 2019
Tutorial: To simulate Hagen-Poiseuille flow in OpenFOAM.
Script and Narration : Saurabh S. Sawant
Keywords: Video tutorial,CFD.
| Visual Cue | Narration |
|---|---|
| Slide 1: | Hello and welcome to the spoken tutorial on simulating Hagen-Poiseuille flow in OpenFOAM. |
| Slide 2 : Learning Objectives
|
In this tutorial we will see:
|
| Slide 3: System Requirement | To record this tutorial, I am using
|
| Slide: System Requirement | The tutorials were recorded using the versions specified in previous slide
Subsequently the tutorials were edited to latest versions To install latest system requirements go to Installation Sheet |
| Slide 4: Prerequisites | To practice this tutorial learner should have the knowledge of
Basic Fluid Dynamics and Hagen-Poiseuille flow |
| Slide 5:
Hagen-Poiseuille Flow Diagram
|
Here is, Hagen-Poiseuille Flow Diagram.
We can see the dimensions and boundaries of the pipe. Viscosity of the fluid used, that is, water is given. Pressure at the inlet is 20 Pascals and at the outlet is 0 Pascals. As it is an incompressible flow, only the pressure difference is of importance. |
| Slide 6:
Formulas and Analytical Solution Read aloud the given points |
Formulas and Analytical Solution:
For Hagen-Poiseuille flow, Pressure drop along the pipe is: (P1 minus P2) equals (32 mew Uaverage L) upon (D square) By substituting the values from the previous diagram, we get, Uaverage equals to 0.208 m/s Maximum Velocity is given as, Two times the average velocity, which would be, 0.416 m/s Reynolds Number for the flow is, Uaverage into D upon nu, that comes out to be, 2080 Hence, the flow is transient. |
| Slide 7: Transient Solver | Type of solver used here is,
IcoFOAM
It is used for incompressible, laminar flow of Newtonian fluids. |
| Slide 8:
Pressure Boundary Conditions |
Pressure Boundary Conditions used,
At Inlet: fixedPressure At Outlet: fixedPressure At Walls: ZeroGradient |
| Slide 9:
Velocity Boundary Conditions |
Velocity Boundary Conditions used,
At Inlet: pressureInletVelocity At Outlet: zeroGradient At Walls: fixedValue |
| Show 3dpipe folder.
Show the 3dpipe folder |
For executing this case,
First, Let's create the case directory in the 'icoFoam' folder. And Give it some name. I have named it as '3dpipe'. |
| Point the mouse pointer from lid driven folder to 3d pipe folder. | To know the location of this folder, go through the tutorial on lid driven cavity.
Copy this '0' (zero), 'constant' and 'system' folders of lid driven cavity problem in the newly created folder.
|
| Go inside the 3dpipe folder. | Let's go inside the '3dpipe' folder. |
| Hover the pointer over the folder inside the 3dpipe folder. | I have already copied the folders into my '3dpipe' folder and modified the files in it. |
| Go into the '0' folder and open P file and show it | Now, let's go into the '0' folder.
And open the 'P' file. This is the pressure boundary condition file. |
| Show the pressure boundary condition file and show the dimensions inside it. | Note that the dimensions are in (meter square) per (second square) (m2/s2). |
| Show the pressure value written | Hence the pressure value in pascals is divided by the density, that is, 1000 Kg/m3 (Kg per meter cube), and written here. |
| Close the file | Let's close the file. |
| Open U file in the same folder and show | File containing the velocity boundary condition is as seen:lets open the file we can see the velocity boundary condition for inlet, outlet and fixed walls |
| Close the file and come out of the '0' folder | Let's close the file and come out of the '0' folder. |
| Switch back to the slides | To see the blocking strategy, let me switch back to the slides. |
| Slide 10: Blocking Strategy
Hover the pointer on the geometry and drag it towards the z direction. |
To create a 3D geometry of a pipe I have made a 2D circular geometry and extruded the length in z direction. |
| Point out the numbering pattern. | Numbering Pattern is as shown. You can also see the dimension of the mesh. |
| Minimize the slides | To see the blockMeshDict file, let's minimize the slides. |
| Go to folder 'constant' and then 'polyMesh' and open blockMeshDict file and show it. | Let's go into the folder 'constant', and then 'polyMesh'. lets open theblockMeshDict ' file. We can see the vertices, blocks,edges and boundaries for inlet, outlet and fixed wall. |
| Close the file and come out of the folder 'polyMesh | Let's close the file and lets come out of the 'polyMesh' folder. |
| Open and show transportProperties file and point at the value viscosity value | We see the 'transportProperties' file. Lets open the file
Note the dynamic viscosity value, here, is 1e-06. |
| Close the file and come out of the 'constant' folder. | Let's close the file and come out of the 'folder ''constant' . |
| Go into the system folder and open the controlDict file. Show it. | Let's go into the 'system' folder.
Now, let's have a look at the 'controlDict' file. |
| Show time step value | The solution converges after 18 seconds therefore the final time step is kept 19.The time step has been set to 1e-03.
|
| Close the file and the Home folder | Let's close the file.
Let's close the 'Home' folder. |
| Press 'control', 'alt' and 't' keys altogether | Now to execute the case, we will, first, go inside the '3dpipe' folder through terminal.Let's open the terminal by pressing 'control', 'alt' and 't' key, altogether. |
| Type run and press Enter in the terminal. | Type run and press Enter |
| Type cd (space) tutorials and press Enter | Type cd (space) tutorials and press Enter |
| Type cd (space) incompressible and press Enter | Type cd (space) incompressible and press Enter |
| Type cd (space) icoFoam and press Enter | Type cd (space) icoFoam and press Enter |
| Type cd (space) 3Dpipe and press Enter | Type cd (space) 3Dpipe and press Enter |
| Type blockMesh and press Enter | Now to create the mesh, type blockMesh and press Enter.
Meshing has been done. |
| After the meshing is done, type icoFoam to start the iterations | To start the iterations type icoFoam and press Enter.
We see the iterations are running. |
| After the iterations are done, type paraFoam for postprocessing the results and press Enter. | Iterations has been done.
After the iterations end type paraFoam for postprocessing the results and press Enter. It will open the" paraview". This is " paraview" |
| Click on Apply. | Let's click on Apply on the left hand side of the Object inspector menu to see the geometry. |
| Rotate the geometry by pressing the button of the mouse and move it in the required direction. | Let's rotate the geometry for a better view. |
| Click on the active variable control menu and select U in the drop-down menu | Click on the active variable control menu and select U in the drop-down menu. |
| Click on play button | At the top, in VCR toolbar, click on Play button. |
| Go to Object Inspector menu, go to Display, click on Rescale data range | Go to Object Inspector menu, go to Display, click on Rescale to data range. |
| go to the toolbar named common, click on Clips and press Apply | To view the half section, go to the toolbar named common, click on Clips go to object inspector menu properties and press Apply.Lets Zoom in |
| Open the color legend | Let's open the color legend. |
| We can see the maximum velocity is near to the actual maximum velocityi.e 0.4 metersp/s | |
| Go to Filters> Data Analysis> Plot Over Lines | To view the graph Go to Filtersat the top Data Analysisand press Plot Over Lines. |
| click on Y axis and press Apply | Press Y axis and press Apply. |
| Point towards the parabolic profile | We can see the parabolic profile for Hagen-Poiseuille flow. |
| Close the graph | Let's close the graph. |
| Close ParaView | lets Close ParaView. |
| Switch to the slides | And switch to the slides. |
| Slide 11: Summary | In this tutorial we have learned:
*To visualize the velocity results in Parafoam .
|
| Slide 12 : Assignment
|
As an assignment,
Change the geometry parameters such as length and diameter. Change the corresponding pressure ratio. and Use the fluid of different viscosity. |
| Slide 13: About Spoken tutorials |
|
| Slide 14: About Spoken tutorials | The Spoken Tutorial Project Team
|
| Slide: Forum to answer questions | Do you have questions on THIS Spoken Tutorial?
Choose the minute and second where you have the question Explain your question briefly Someone from the FOSSEE team will answer them. Please visit http://forums.spoken-tutorial.org/ |
| Slide: Forum to answer questions | Questions not related to the Spoken Tutorial?
Do you have general/technical questions on the Software? Please visit the FOSSEE forum http://forums.fossee.in/ Choose the Software and post your question |
| Slide: Lab Migration project | We coordinate migration from commercial CFD software like ANSYS to OpenFOAM
We conduct free Workshops and provide solutions to CFD Problem Statements in OpenFOAM For more details visit this site: http://cfd.fossee.in/ |
| Slide: Case Study project | We invite students to solve a feasible CFD problem statement of reasonable complexity using OpenFOAM
We give honorarium and certificate to those who do this For more details visit this site: http://cfd.fossee.in/ |
| Slide 15: Acknowledgement | Spoken Tutorial Project is a part of the Talk to a Teacher project
|
