SaveMotion: xpos and zpos

Asalih3d

Hi everyone!

For example looking at examples/mdbc/07_WavesCylinder, I see xpos and zpos being given as xpos = 2.2 and zpos=-0.1.

I understand xpos = 2.2 since it is the middle of the cylinder, but I do not understand zpos completely. In the XML guide it is defined as "zpos=-depth", so if depth = 0.5, then by default zpos=-0.5, which means that we measure the analytical solution at the seabed?

But when zpos is then defined as zpos = -0.1, then we set the zpos outside the water surface?

Could anyone explain it to me?

Kind regards

Alex

SAVEMOTION allows you to compute the THEORETICAL values so xpos and zpos are no more related to our SPH domain, but they will be:

• xpos indicates distance from the piston
• zpos indicates distance from the surface so z=-0.1 means 0.1 below surface

Regards

Asalih3d

Ah okay thanks a lot! So basically we take the mean water level of the analytical solution minus zpos, and measure the properties at that point.

Makes sense.

Kind regards