How to model sea floor and soil contact for slender system lines This is valid for slender system only 1. Models in SIMA The seafloor/soil models can be split into three groups Seafloor contact : Structures laying on the sea floor Soil contact : Structures penetration the soil Alternative methods covers both group a and b. See user manual: Contact Formulation 2. Sea floor contact (a) The seafloor contact formulation includes contact normal to the seafloor modelled by springs in-plane contact modelled by a combination of springs and frictional forces. Sea floor contact specification Specify the relation between the sea floor contact and the line ID and line segments 3. Riser soil (a) The contact model includes in addition to the sea floor contact nonlinear stiffness as the pipe is pressed into the seafloor and a separate unloading curve as the pipe is lifted suction forces are activated as the pipe is lifted off the seafloor Ref. Voie, P. E., Skeie, G. and Bergan-Haavik, J. (2014): Importance Rating of Riser-Soil Interaction Effects,OMAE2014 4. Geotechnical spring specification (b) Used to specify geotechnical springs in the global X-Y plane suitable for modelling cyclic geotechnical data with degradation See user manual Geotechnical spring 5. Geotechnical soil model (b) The input to the geotechnical soil model consists of Materials. The options are Clay, see user manual Goetechnical model - Clay Material Sand, see user manual Goetechnical model - Sand Material The Geotechnical specification Defines the soil types as a function of the depth See user manual Geotechnical model The Geotechnical line Specification Links the geotechnical input to a line ID 6. PISA Soil Model (b) Soils for use with the soil layer profile definition, intended for modelling of embedded piles The input to the PISA Soil Model consists of Soil components. The options are Pisa Clay Pisa Sand Dunkirk sand Pisa Soil layer profile The soil layer profile is a vertical slice of soil layers with specified thickness The soil characteristics are specified in Soil (Soil components) 7. Alternative methods to model sea floor and soil contact (c) Option I: Global springs see user doc Option II: User defined elements .. Second order wave kinematics Referring to model values in scripting