This chapter discusses features related to contact and interaction modeling. It provides an overview of the following enhancements:

• “Parallel cavity radiation,” Section 11.1

• “Penalty stiffness for contact involving gaskets,” Section 11.2

• “Edge-to-edge general contact enhancement,” Section 11.3

• “Supplementary edge-to-surface formulation for general contact,” Section 11.4

• “Accounting for friction coefficient changes in default choice of solution scheme,” Section 11.5

• “De-emphasized contact controls,” Section 11.6

• “Disallowed combination of features at contact interfaces,” Section 11.7

• “Enhancements for contact interactions involving pore fluid diffusion,” Section 11.8