Level Set Contact Extension

Level Set Contact Extension = {yes|no}

Description / Usage

This card specifies whether the level set surface is considered to extend into boundaries when performing renormalization of the level set distance function. This card applies only if Level Set Renormalization Method = Huygens_Constrained. Permissible values for this option are:

yes|on

The level set interface is considered to extend smoothly into the boundaries.

no|off

The level set interface ends at the boundaries; this is the default.

Examples

This is a sample input card:

Level Set Contact Extension = no

Technical Discussion

When renormalizing the level set distance function, the behavior of the interface near boundaries is important. When the interface is considered to end at the boundary, a large number of grid points may be closest to this boundary point. This appears as a cusp in the interface and can make it difficult to achieve sharp contact angles because of the very large capillary force that results. One method to alleviate this is to extend the interface smoothly into the boundaries to eliminate the cusp in the interface. The current algorithm, however, can cause errors when employed near corners of the domain. Until this is resolved, this option can only be recommended for domains without interior corners.