FSI Deformation Model#

FSI Deformation Model = {model_name}

Description / Usage#

This card specifies the type of interaction the lubrication shell elements will have with any surrounding continuum element friends. When not coupling the lubrication equations to a continuum element, this card should be set to the default value, FSI_SHELL_ONLY. All models are described below:

FSI_MESH_BOTH This model should be used when both the shell and neighboring continuum elements use deformable meshes and the user wishes to full couple these behaviors. This model is not currently implemented and should not be used.

FSI_MESH_CONTINUUM In this model, the neighboring continuum elements use mesh equations, but the lubrication shell does not. This model features a two-way coupling, where the lubrication pressure can deform the neighboring solid (through the appropriate boundary condition) and deformations to the mesh in turn affect the height of the lubrication gap. This is equivalent to the old “toggle = 1”.

FSI_MESH_SHELL This model accounts for mesh equations present in the lubrication shell, but not in the adjoining continuum elements. This model is not currently implemented and should not be used.

FSI_SHELL_ONLY This model can be thought of as the default behavior, where there is no coupling between the lubrication shell elements and any neighboring continuum elements. This should also be used if only shells are present.

FSI_MESH_UNDEF This model is similar to FSI_MESH_CONTINUUM, but the normal vectors in the shell are calculated using the original undeformed configuration, rather than the current deformed state. Implementation of this model is currently in progress and needs to be fully tested.

FSI_MESH_ONEWAY This model is similar to FSI_MESH_CONTINUUM, but only utilizes a one way coupling. Deformations in the neighboring continuum element do not affect the lubrication height, but do affect the calculated normal vectors. This is equivalent to the old “toggle = 0”.


Technical Discussion#


No References.