PHASTA/Probe points

Phasta is capable of outputting solution field variables such as velocity, pressure, eddy viscosity, and temperature (if applicable) at specified locations in the fluid domain.

Using Probe Points

To enable probe points, the file xyzts.dat and the folder varts/ must both be present in the n-procs_case directory that is being used by Phasta. The file xyzts.dat should contain a one line, space delineated header with the following numeric data

• number of probes
• frequency (i.e. the number of steps between sampling)
• tolerance
• iterate (does not appear to do anything)
• number of field variables (e.g. 5 for incompressible with one equation turbulence model and 6 for compressible with a one equation turbulence model)

The lines following the header should contain x, y, z data specifying the location of the probe points. As an example, a valid xyzts.dat file for an incompressible run would look something like:

 4 1 1.0e-6 1 5
 0.2 -0.02 -0.01
 0.2 -0.02  0.01
 0.3 -0.02 -0.01
 0.3 -0.02  0.01

Note: in most versions of Phasta, the varts.*.sn files are created prior to the calculation of the first time step, but are actually written to after finishing the last time step. This means that if a run is interrupted (e.g. by not requesting enough time in a queue), no useful data will be generated.