Product(s):	MAXSURF Stability
Version(s):
Area:	Fluids Analysis Methods

Problem

What is the difference between the Fluid Analysis Methods?

Solution

Stability allows you to specify two different ways of simulating any fluids contained in tanks or compartments.

You can use corrected VCG or Simulate fluid movement.

When using corrected VCG, tank capacities and free surface moments are calculated for the upright hull (zero trim and zero heel). The effective rise in VCG due to the tanks’ free surface is calculated by summing the free surface moment of all the tanks and dividing by the total vessel displacement. The FSM is applied if the filling level is within the exclusive range specified.

While working with Fluid Simulation, this method simulates of the static movement of the center of gravity of the fluid in each tank accurately. Every tank is rotated to the heel and trim angle being analyzed. From there, new center of gravity is calculated for each tank and used in the analysis. The new LCG, VCG and TCG are calculated for the whole design and used in the calculation of GZ, KG, and GM.

In Fluid Simulation it can be used at high angles of heel or trim, or with tanks whose heeled water plane area may be significantly different from the upright case, you can also check how the CGs of the tanks change as you select different heel angles.