Post-Processing

nFX[c] post-processed data is often faster to load, easier to represent and easier to understand, especially when looking at the time averaged results.

It is strongely encouraged to take advantage of the nFX[c] when post-processing.

When you want to show transient flow, you should choose one of the following options:
  • Use Volumetric Rendering is used in ParaView, after importing nFX[c] data format (.vti), which is the preferred option as it allows for nuanced visualization and provides very effective information and can easily be manipulated for further insights.
  • Use particles themselves and reduce their opacity (set it to 0.3 or 0.2).

Extracting free surface iso-surfaces should be exclusively used for fully photo-realistic renderings for internal or external marketing. In these situations, the best thing to use for iso-surfacing is the Shepard coefficient (via ParaView’s Contour filter). For fluids, the value that gives the most effective results is between 0.15 and 0.3, depending on the case.

Value of the Shepard coefficient for extracting a free surface is completely arbitrary. In other words, the values that are recommended are only best practice advice as those numbers have been seen to give the most realistic impression of the fluid in most cases.

Restriction: You should never visualize any variables on a Shepard coefficient extracted iso-surface, for example velocity colored iso-surface based on a Shepard coefficient. This can be very misleading.

For more instruction-based advice, consult the training material.