Add Fill Point

Introduction

The Add Fill Point function allows you to modify the number and position of flood fill points in your system. The fill point differentiates the interior from the exterior zone. To do this, the solver performs a 3D-flood fill beginning at a user-defined fill point and then expands to the boundaries of the vessel walls and/or the simulation bounding box.

Fill Points can serve multiple functions in M-Star. They determine the extent of the domain as a default, but they can also determine the initial conditions of a space.

Fill Points

Extent of the Domain

The Fill Point on the Main Lattice page is used to define the initial extent of the domain. By default, the fill point is set to the center of the main lattice domain. Users can move the flood fill point to other locations inside the domain or add multiple flood fill points.

Initial Conditions

The Fill Point can also be a child geometry that indicates which space will initially be 3D-filled with a liquid. This applies to Free Surface, Immiscible Two Fluid, and Scalar models. At runtime, the code does a 3D-flood fill from this point to the boundaries of the vessel or simulation bounding box (whichever comes first) to define the extent of the fluid’s initial condition.

In the example below, the simulation domain includes a static tank, and the fluid configuration is set to free surface. A fill point is added to the system, which by default is positioned at the center of the main lattice domain. Its location is then adjusted in the property grid by modifying the coordinates (or alternatively, using the context-specific toolbar). As a result, the tank is filled with fluid up to the fluid height box, leaving empty headspace above.

Access

When you select Add Fill Point on the applicable context-specific toolbar, a new fill point is formed and the property grid below will launch.

Property Grid

General

Point

m | This is where the location for the fill point is indicated. The location can be moved or modified by adjusting the coordinates. The point can also be moved or rotated by using Move and Recenter on the Fill Point Toolbar.

Location

The Add Fill Point form is found on the following context-specific toolbars:

Free Surface

Immiscible Two Fluid

Scalar Field

Main Lattice

Fill Point Toolbar

Context-Specific Toolbar Options	Description
Move	The Move form enables three-dimensional rigid body transform of object through free drag or point-to-point snapping.
Recenter	The Recenter command snaps a plane to the center of the bounding box.
Help	The Help command launches the M-Star reference documentation in your web browser.

See also Child Geometry Context Specific Toolbar.

For a full description of each selection on the Context-Specific Toolbar, see Toolbar Selections.