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#17: How to model open deck wells
Open wells on the deck of displacer parts take on water at the level of the
external waterline like flooded tanks, regardless of whether these wells
appear to be protected by deck edges that are above the waterline. This
can be clearly visualized in Condition Graphics by looking at a body view
that cuts through the open well.
However, often it is desired instead for water to enter an open well
only when the external waterline reaches the well's perimeter on the deck.
This can be accomplished using the following method:
1. In Part Maker, create a new tank part (say, OPENWELL.C) with the dimensions
of the open well, and remove any corresponding open well deduction from the
2. Create a series of critical points that are appropriately spaced around
the perimeter where the open well intersects the displacer deck. If this
perimeter is roughly shaped like a polygon (such as a rectangle), then a
critical point at each vertex would be sufficient. These points can be
created using the CRTPT command either in Part Maker when the vessel tanks
are modeled or later in GHS.
In either case, be sure to include the CRTPT /TANK:OPENWELL.C parameter when
defining each critical point to associate it with the open well tank.
3. In GHS, set the open well tank to damaged with sea contents using the commands:
CONTENTS (OPENWELL.C) SEA
TYPE (OPENWELL.C) DAMAGED
By associating the perimeter critical points with the damaged open well tank,
its reference point for damage will be dynamically assigned to the lowest
critical point along the perimeter of the open well. This produces the desired
behavior of keeping the open well dry when the external waterline is below the
well's deck perimeter, otherwise flooding it to the level of the waterline.
More information can be found at HELP CRTPT and HELP PM in
the "Critical Point Specification" section.
GHS version 11.94 or later is required to access this feature.
For help updating your GHS version, please contact firstname.lastname@example.org.
Copyright (C) 2011
Creative Systems, Inc.