# Defining the constitutive response of fluid within the cohesive element gap

 The cohesive element fluid flow model: is typically used in geotechnical applications, where fluid flow continuity within the gap and through the interface must be maintained; enables fluid pressure on the cohesive element surface to contribute to its mechanical behavior, which enables the modeling of hydraulically driven fracture; enables modeling of an additional resistance layer on the surface of the cohesive element; and can be used only in conjunction with traction-separation behavior. The features described in this section are used to model fluid flow within and across surfaces of pore pressure cohesive elements. The following topics are discussed:
 Related Topics About cohesive elements Defining the constitutive response of cohesive elements using a traction-separation description In Other Guides *FLUID LEAKOFF *GAP FLOW Adhesive joints and bonded interfaces

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