post processing codes to get vz(t)

[VatsalSy]

this should give vz(t) in the raw form as seen by basilisk

steps to do post processing:

1. Run your code, cavity.c
2. compile the get* codes.
3. run the getInterface.py python code. This code triggers getFacet and getEtaNvz. getFacet is used to get the interface in the form of segments and getEtaNvz is used to get the interface position and velocity at r = 0. the latter will save the interface position and velocity in a csv file...
4. It will create images in VideoInterface where you can verify that the point that you track is the correct one.
5. t,r,eta,vz will be saved in the file called: etaNvz.csv

test.mp4

there is also a jupyter notebook that you can use to plot the t,vz...