Hi Simon, It's not clear what is going on here, the nonlinear residuals look good and then you suddenly get a NaN, doesn't seem to be a time step problem. What do your results look like before the failure? Upload you SV Simulations directory someplace I can download it and I'll have a look. Cheers, ...

Hi Simon,

It's not clear what is going on here, the nonlinear residuals look good and then you suddenly get a NaN.

Upload you SV Simulations directory someplace I can download it and I'll have a look.

Cheers,
Dave

Hi Flo, I reran a simulation with default solver parameters (e.g. Maximum Number of Iterations for svLS Momentum Loop=2 rather than what you had originally had Maximum Number of Iterations for svLS Momentum Loop=10) and the results were ok. I think the Maximum Number of Iterations for svLS -type par...

The path points match the segments fine.

What image data are you using? Maybe the image data is not scaled correctly.

What exactly are you trying to do here?

Cheers,
Dave

Hi Flo, I did not read the details of your first post closely enough, just responded to negative pressures , sorry! Your flow results look fine but your pressure results do indeed look odd. And if the solver is failing with a singular matrix error then your simulation is not well-defined. Upload all...

Hello,

You can define pressure BCs using GenBC (https://simvascular.github.io/documentation/genbc.html).

Cheers,
Dave

Hello,

You will need to upload your .pth file so I can reproduce what you are seeing.

Cheers,
Dave

Hello,

Why do you think a negative pressure is incorrect?

Cheers,
Dave

Hi Simon,

Is your simulation starting at time step 1? Make sure that there are no simulation files left over from your previous simulations, otherwise the solver will restart the simulation from those files.

Cheers,
Dave

Hello, I looked at the two segmentations in SV and they appear to be geometrically identical. I seem to recall that the first two control points are not in fact used as control points, I think they are the contour center and a point on the contour, that are used to transform (e.g. scale) the contour...