A long time ago, before the dawn of personal computers, a bold decision was made. GHS would treat liquids as liquids by default.
Any inclination of the vessel would trigger a recalculation of the location of each tank load. It has always been this way. This is the way.
Without parameters, the typical stability commands such as SOLVE, GHS, and RAH all give results that account for the self-leveling nature of liquids.
Even STATUS shows tank centers using internal waterplanes that are parallel to the earth's surface.
Did you know that GHS itself can be used to demonstrate how it treats liquids? The image below shows the tank load shifting at different heel angles (0 - 10 degrees).
The process repeats for three different tank levels.
For extra intrigue, the free surface moment is printed above the point representing the liquid's center of gravity.
Try this demo yourself by downloading these files!
As mentioned in COW086, GHS offers many different options for assigning Free Surface Moments to tanks. But those formal values are only effective if we use some other method to mimic the effect of free surfaces.
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