OpenFOAM/C2/Basic-Post-Processing-using-ParaView/English

Tutorial : Basic Post-Processing using ParaView

Script : Subhasree Basu

Narration : Deepa Vedartham

Keywords: OpenFOAM-5, Velocity vectors, Stream lines, slice, clip, ParaView, Spoken Tutorial

Visual Cue	Narration
Slide 1 : Title	Hello and welcome to the spoken tutorial on Basic Post-Processing using ParaView.
Slide 2 : Learning Objectives	In this tutorial, we will learn some basic visualization techniques in ParaView.
Slide 3 : Learning Objectives	Under this we will learn: Variable visualization Velocity vector visualization Streamlines visualization Slice and Clip filters
Slide 4 : System Requirement	To record this tutorial I am using Ubuntu Linux Operating system 16.04 LTS OpenFOAM version 4.1 ParaView version 5.0
Slide 5 : Pre-requisite	To practice this tutorial, the user should have Basic knowledge of Linux terminal commands Experience with simulating cases in OpenFOAM Working skills in ParaView If not, please go through the previous OpenFOAM spoken tutorials on this website: https://spoken-tutorial.org/
Slide 6 : Problem Statement-Variable Visualization	Variable visualization OpenFOAM has provided an inbuilt case file for pitzDaily.
Slide 7 : Problem Statement-Variable Visualization	Here we will: focus on post-processing of the pitzDaily solution learn to visualize flow field variables like velocity, pressure, vorticity, etc. learn to visualize velocity vector within the flow field
Slide	You can find the pitzDaily case file within the simpleFoam directory within OpenFOAM-4.0>tutorials directory. I have already copied this file in my work folder and run the simulation in my machine using simpleFoam.
Open a command Terminal.	Now we will open this solved case file in the command terminal.
Type cd /opt/openfoam4/tutorials/incompressible/simpleFoam/pitzDaily	Here I will type: cd /opt/openfoam4/tutorials/incompressible/simpleFoam/pitzDaily
Type ls	To see the content inside this folder type ls. You will see all these files here.
Type paraFoam	Now to post-process this simulation, type paraFoam, in the command terminal. This will open the ParaView window.
ParaView Window >> click Apply	To visualize the domain geometry click Apply button. This is on the top left corner of the Properties panel.
Graphic window >>	This will show the domain geometry on the Graphic window.
Scroll down >> point to the different types of Volume fields	Now scroll down within the Properties panel. You will see the different types of Volume Fields available for visualization. Here we will visualize the velocity field within the domain.
Check the U variable	For this, check the U variable within the Volume Field. Please note that the U variable is available to visualization, by default.
Go to the toolbar.	Now go to the toolbar.
Drop-down >>change vtkBlockColors to U	Change the vtkBlockColors to U from the drop-down options. This will show the initial flow conditions on the Graphic window.
Menu bar >> click the lastFrame button.	Now go to the Menu bar and click the lastFrame button.
Velocity field pattern	You can see the velocity field pattern of the converged solution. This will visualize the flow velocity field after 298 iterations. Thus we have learnt to visualize field variables in ParaView.
Click on the Glyph filter >> point to the Pipeline window.	After this we will learn to visualize velocity vectors. To do this, click on the Glyph filter on the toolbar. This will add a new component to the Pipeline window.
Scroll within the Glyph Properties panel.	Now within the Glyph Properties panel make sure the Glyph type is arrow Scale Mode is off Scaling Factor is 0.003 Keep the rest as default.
Click Apply button.	Click Apply button on the top left corner of the Properties panel. You will see small velocity vectors visualized within the domain.
Point to circulation zone and magnitude of velocity.	You can now clearly see the circulation zone and magnitude of velocity. Thus we have learned to create velocity vector in a flow field.
Close ParaView window	After this close ParaView window. Now let us go back to the next problem statement.
Slide 8 : Problem Statement-Streamlines Visualization	Streamlines Visualization OpenFOAM has provided an inbuilt case file for flow over a motorBike.
Slide 9 : Problem Statement-Streamlines Visualization	Here we will: focus on post-processing of the motorBike solution learn to create stream lines and view them in ParaView
Terminal >> Visual Narration >>	You can find the motorBike case file in the simpleFoam directory within OpenFOAM-4.1>tutorials directory. I have already copied this file in my work folder. And run the simulation using simpleFoam.
Terminal Type cd .. Type cd motorBike	Now open this solved case file in the command terminal. Here I will type cd space dot dot cd space motorBike
Type ls	To see the content inside type ls You will see all these files here.
Type paraFoam	Now to post-process this simulation, type paraFoam in the command terminal. This will open the ParaView window.
ParaView Window >>click Apply in Properties panel.	To visualize the domain geometry, click Apply button on the top left corner of the Properties panel.
Menu bar >> click on lastFrame button	To include the last iteration, click on the lastFrame button on the Menu bar.
Tool Bar >> directional view >> +Y.	Go to the Tool Bar and set the directional view to +Y.
In drop-down >> Change vtkBlockColors to U	Change the vtkBlockColors to U from the drop-down options.
Scroll down Properties panel to Opacity	Now scroll down on the Properties panel to Opacity.
Reduce the Opacity	Reduce the Opacity to make the domain transparent like this. You will be able to see the motor bike with the rider through the domain now.
Tool Bar >> click on stream Tracer filter	To create streamlines around the motor bike, click on stream Tracer filter on the Tool Bar. This will add a new component within the Pipeline browser.
Properties panel >>Seeds section >> change Point to (5 0 1) Change Number of Points to 15 Change the Radius to 1	Here in the Properties panel change the Point to (5 0 1) coordinates within Seeds section. This will change the location of the center of the stream lines. Now change the Number of Points to 15. This show the number of stream lines you want to create. Change the Radius to 1. This changes the radius of the stream line points. Keep the rest of the values as default.
Click Apply	After all changes have been made, click Apply on the Properties menu of the stream Tracer. You can see stream lines around the motor bike along with their magnitude. Thus we have learned to create stream lines in ParaView.
Close ParaView window.	After this close the ParaView window.
	We will go to the next problem statement.
Slide 10 : Problem Statement-Clip and Slice Filters	Clip and Slice Filters OpenFOAM has provided an inbuilt case file for hotRadiationRoom
Slide 11 : Problem Statement-Clip and Slice Filters	Here we will: focus on post-processing of the hotRadiationRoom solution learn to use filters like clip and slice in ParaView
Terminal >> Open case file as per narration	To open the hotRadiationRoom case file go to the hotRadiationRoom tutorial in BuoyantSimpleFoam within heatTransfer case directory. You can find this within OpenFOAM-4.1>tutorials directory.
	I have already copied this file in my work folder and run the simulation using BuoyantSimpleFoam. Now open this solved case file in the command terminal.
Type cd /opt/openfoam4/tutorials/heatTransfer/buoyantSimpleFoam/hotRadiationRoom	Here I will type cd /opt/openfoam4/tutorials/heatTransfer/buoyantSimpleFoam/hotRadiationRoom
Type ls	To see the content inside type ls. You will see all these files here.
Terminal >> type paraFoam	Now to post-process this simulation, type paraFoam, in the command terminal. This will open the ParaView window.
ParaView Window >> click Apply button	To visualize the domain geometry, click Apply button on the top left corner of the Properties panel. This will show the domain geometry on the Graphic window.
Scroll inside Properties menu	Now scroll down within the Properties menu. You will see the different types of Volume Field available for visualization.
Volume Field >> check T variable >> click on Apply.	Here we will visualize the Temperature field within the domain. For this check the T variable within the Volume Field and click on Apply.
Toolbar drop-down >> change vtkBlockColors to T	Now go to the toolbar. Change the vtkBlockColors to T from the drop down options. This will show the initial flow conditions on the Graphic window.
Toolbar >> set directional view to +Z.	Go to the toolbar and set the directional view to +Z.
Menu bar >> click Play	Now go to the Menu bar and click Play button. You can see the temperature field pattern of the converged solution. This will visualize the flow temperature field after 900 iterations.
Scroll Graphic window.	Now click and scroll on the Graphic window. You can clearly see the temperature gradient due to radiation near the hot object. But we are unable to visualize the whole section. Thus we need to get a sectional or planar view of the field.
ParaView Window >> toolbar >> click on clip filter	First we will learn to create a sectional view of the field. To do this, click on the clip filter on the toolbar. This will add a new component to the Pipeline window.
Properties panel >> select Y Normal.	Now in the Properties panel select Y Normal.
Scroll Graphic window >> shift reference section	Scroll on the Graphic window like this. Then shift the reference section to the middle of the hot box.
Properties panel >> click Apply	After this click Apply on the Properties panel.
Toolbar >> change view direction to +Y	Now change the view direction to +Y on the toolbar. Thus you can see the sectional view of the temperature field.
Delete this filter	Now delete this filter to visualize the full domain from the Properties panel.
ParaView Window >> toolbar >> click on slice filter	Now we will learn to create a planar view of the field. To do this, click on the slice filter on the toolbar. This will add a new component to the Pipeline window.
Properties panel >> select Y Normal.	Now in the Properties panel select Y Normal.
Scroll Graphic window >> toolbar >> change view direction to +Z	Scroll on the Graphic window like this. Now change the view direction to +Z on the toolbar.
Graphic window >> shift reference section	Then shift the reference section to the middle of the hot box.
Properties panel >> click Apply	After this click Apply on the Properties panel.
toolbar >> change view direction to +Y	Now change the view direction to +Y on the toolbar. Thus you can see a plane section view of the temperature field.
Close the ParaView window and switch to the slides	Close the ParaView window.
Slide 12: Summary	Let us summarize. In this tutorial, we learnt some basic Post-Processing using ParaView. Under this we have learnt to Visualize field variable Create Velocity Vectors Create Stream lines Use clip and slice filters
Slide 13: Exercise	You can use the discussed utilities on other inbuilt case files. This will help you understand the post-processing using ParaView better.
Slide 14: Forum to answer questions	Please post your timed queries in this forum.
Slide 15: Forum to answer questions	Please post your general queries on OpenFOAM in this forum.
Slide 16: Case Study Project	The FOSSEE team coordinates the Case Study project.
Slide 17: Lab Migration Project
Slide 18: Acknowledgement https://spoken-tutorial.org	The Spoken Tutorial Project is funded by NMEICT, MHRD, Govt. of India. For more details, visit this website.
Thank You	This is Deepa Vedartham from IIT Bombay signing off. Thanks for watching.

Contributors and Content Editors

DeepaVedartham, Nancyvarkey