Van der Waals interactions in Dmol3

Hi erveryone,

           I wonder to know  whether Van der waals interactions have been considered during a geometry optimization process in Dmol3?  If so, which kind of interactions are considered? And another question, if  I want to discuss the effect of the van der waals interactions on the interfacial interactions between a small molecule and a inorganic materials surface, what factors should be considered?

Sincerely yours