Asteroid Impact

Asteroid Impact #

In this section of the tutorial we will explore data from a shock physics simulation of an asteroid impact.

The data for this tutorial is currently available on OLCF at /lustre/orion/world-shared/stf007/msandov1/scivis_datasets/scivis_2018_deep_impact. The data originally comes from SciVis 2018 contest: https://sciviscontest2018.org/. The original simulation was an ensemble studying the effect a large asteroid impact in the ocean could have and how it might propagate to land.

Connect to Andes #

One node should be sufficient.

Open one of the File Sets #

  1. Click on Open file
  2. Navigate to /lustre/orion/world-shared/stf007/msandov1/scivis_datasets/scivis_2018_deep_impact
  3. Navigate to the yA31 subdirectory (need to open the yA* group)
  4. Open the pv_insitu_300x300x300_..vti time series
  5. Turn off the vtkGhostType and vtkValidPointMask arrays
  6. Apply

View a Slice of the Data #

  1. Add the Slice filter
  2. Click the Z Normal button
  3. Turn Show Plane off
  4. Apply

View the Pressure of the Materials #

The asteroid impact sends pressure waves through the air and water. Let’s look at the shock front in the air.

  1. Color the slice by prs
  2. Select Rescale to Custom Data Range
  3. Change the upper range to 2e7
  4. Play through timesteps to see how the simulation progresses over time.

You can also pause the playback and browse through timesteps.

View 3D Versions of the Objects in the Scene #

The data has volume fraction fields providing the fraction of space occupied by the water and rock, respectively. We can create contours at the interface of 50% occupancy to estimate the shape of the objects.

  1. Select the reader (pv_insitu_300x300x300_*.vti) in the pipeline browser
  2. Add the Contour filter
  3. Change Contour By to v03
  4. Change the isosurface value to 0.5
  5. Apply
  6. Color the contour by Solid Color
  7. Edit the color to a value appropriate for rock

Repeat steps 1-7 again except change the Contour By value to v02 in step 3 for water. Water tends to be transparent, so find the Opacity parameter for the water contour and change it to 0.5.

Volume render the pressure #

Now that we have a 3D representation of the objects in space, let us show that with the air shockwave.

  1. Select and turn on the visibility (if necessary) of the reader (pv_insitu_300x300x300_*.vti) in the pipeline browser
  2. Change the representation to Volume
    • ParaView will likely give you a dialog box warning you that things might slow down. If so, just click a version of “Yes”.
  3. Color by prs
  4. Open the color map editor
  5. Modify the opacity to best represent the shockwave

Next: Particle Data