Difference between revisions of "OpenFOAM/C2/Basic-Post-Processing-using-ParaView/English"

1. Velocity vector Visualization
2. Streamlines Visualization
3. Slice and Clip filters

System Requirement

• OpenFOAM version 4.1
• ParaView version 5.0

Pre-requisite

• Experience with simulating cases in OpenFOAM
• Working skills in ParaView

If not, please go through the previous OpenFOAM Spoken Tutorials on this website: http://spoken-tutorial.org/

• learn to visualize flow field variables like velocity, pressure, vorticity, etc
• learn to visualize velocity vector within the flow field

Visual Narration >>

I have already copied this file in my work folder and run the simulation in my machine using simpleFoam

Now we will open this solved case file in the command terminal

Here I will type:

This is on the top left corner of the Properties panel

This will show the domain geometry on the Graphic window

Now if you scroll down within the Properties panel

You will see the different types of Volume Field available for visualization

Here we will visualize the velocity field within the domain

For this check the U variable within the Volume Field

Please note that the U variable is available to visualization by default

Now go to the Tool Bar

Change the vtkBlockColors to U from the drop down options

This will show the initial flow conditions on the Graphic window

Now go to the Menu bar and click the lastFrame button

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

Visual Narration >>

To do this click on the Glyph filter on the Tool Bar

This will add a new component to the pipeline window

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 on the top left corner of the Properties panel

You will see small velocity vectors visualized within the domain

You can now clearly see the circulation zone and magnitude of velocity.

Thus we have learned to create velocity vector in a flow field

After this close ParaView window.

Now let us go back to the next problem statement

• learn to create stream lines and view them in ParaView

Visual Narration >>

I have already copied this file in my work folder. Then run the simulation using simpleFoam

Now open this solved case file in the command terminal

Here I will type:

cd ..

Visual Narration >>

Visual Narration >>

To include the last iteration click on the lastFrame button on the Menu bar

Go to the Tool Bar and set the directional view to +Y

Change the vtkBlockColors to U from the drop down options

Now scroll down on the Properties panel to 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

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

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

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

After this close the ParaView window.

We will go to the next problem statement.

• learn to use filters like clip and slice in ParaView

Visual Narration >>

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.

Here I will type:

This will show the domain geometry on the Graphic window

Now if you scroll down within the Properties menu

You will see the different types of Volume Field available for visualization

Here we will visualize the Temperature field within the domain

For this check the T variable within the Volume Field and click on Apply

Now go to the Tool Bar

Change the vtkBlockColors to T from the drop down options

This will show the initial flow conditions on the graphic window

Go to the Tool Bar and set the directional view to +Z

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

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.

Visual Narration >>

To do this, click on the clip filter on the Tool Bar

This will add a new component to the pipeline window

Now in the Properties panel select Y Normal

Scroll on the Graphic Window like this. Then shift the reference section to the middle of the hot box.

After this click Apply on the Properties panel

Now change the view direction to +Y on the Tool Bar

Thus you can see the sectional view of the temperature field

Now delete this filter to visualize the full domain from the Properties panel

To do this, click on the slice filter on the Tool Bar

This will add a new component to the pipeline window

Now in the Properties panel select Y Normal

Scroll on the Graphic Window like this.

Now change the view direction to +Z on the Tool Bar

Then shift the reference section to the middle of the hot box.

After this click Apply on the Properties panel

Now change the view direction to +Y on the Tool Bar

Thus you can see a plane section view of the temperature field

• Create Velocity Vectors
• Create Stream lines
• Use clip and slice filters