Generally speaking, your path should be placed in the lumen center. Try not to create a sharp turn. If the interval between 2D segmentations is too large or too small, you may not represent the anatomy very well or creating a bumpy surface/segmentation intersections along the path with a large curva...

It seems you had some errors with the presolver. It failed to get initial displacements. If you upload your presolver script, I can take a look.

If you use rcrt.dat for your outlet boundary conditions, Rp, C and Rd are constant with time but Pd can be time-dependent, where subscripts p and d represent proximal and distal values respectively. Simvascular's GenBC allows users to supply their own boundary conditions, similar to user-defined fun...

1. You need to know the scale in your images. Simvascular doesn't know that information. If the image is already in cm and you scale it by 0.1, the image will be in dm. In Simvascular, you can calculate outlet/inlet area. Based on the value, it should be easy to tell if the length unit is cm or mm. ...

Outlet flow and pressures could be output directly from Simvascular. For other locations (e.g. the entrance of each branch), you can use Paraview to extract the data.

I am not sure but you can try that.

Prescribing Dirichlet BCs at outlets requires pre-knowledge of the flow conditions/velocity profile. The velocity profile at an outlet depends on upstream information and is usually unknown. When you use the inflow waveform type inflow BC (it is a Dirichlet BC in Simvascular) you enforce a velocity ...

You can try to convert the last restart files only and see if you have any pressure and velocity in the vtu file.
You can switch pressure units in paraview using the calculator.

Yes, you may prescribe a flow waveform on an outlet as you did for an inlet but this is not recommended. If you just have a flow rate for that outlet, it is better to use a resistance or RCR outflow BC that achieve the measured flow rate.

Do you mean the total outflow is not equal to the inflow? If your solutions are converged, the differences in flow went to the vessel. Since the vessel is deformable, velocity on the wall is not zero. If you do a control volume analysis, I think the flow should be conserved.