Fluid-Structure Interface Modeling Parameters dialog box (Simcenter Nastran)

Modeling Object
Name	Sets the name of the modeling object.
Label	Sets a unique numerical identifier for the modeling object.
Properties
Description	Sets a description for this modeling object. Type a brief description or click to open a text editor, where you can enter a longer description.
Card Name	Sets the ACMODL bulk data entry name of the modeling object.See ACMODL for more information.
Type of Coupling (CTYPE)	Specifies the type of coupling.Two-way Coupling (STRONG) — Specifies the two-way coupling (strong coupling). The structural vibration is transferred to the fluid and the resulting acoustic pressure loads the structure.Effect of Structure on Fluid Only (WEAK) — Specifies the one-way coupling (weak coupling), which transfers the effect of structural vibration to the fluid only. It ignores the effect of the fluid pressure on the structure.
Search Units (SRCHUNIT)	Specifies the search unit.You can choose between Absolute (ABS) for absolute model units and Relative (REL) for relative model units based on element size.
Outward Normal Search Distance (NORMAL)	Specifies the outward normal search distance to detect the fluid-structure interface.
Inward Normal Search Distance (INTOL)	Specifies the inward normal search distance to detect the fluid-structure interface.The angular tolerance in degrees is used to determine whether a fluid free face and a structural face are overlapping.
Angular Tolerance (OVLPANG)	The angle value is limited to [0-90] degrees.Note: The software takes the absolute value of the overlapping angle between the normals of the structure and the fluid face; therefore this value must be between 0 and 90.
Coupling Method (AREAOP)	Specifies the area option.If AREAOP=0, the Recommended Simcenter Nastran coupling method is used (default).If AREAOP=1, the RBE3 method is used. Applies an area correction and removes parallel disconnected faces from the coupling.
Fluid Interface (FSET)
Fluid Interface Entities	Specifies the type of entity to define the fluid part of the fluid-structural interface.Nodes — Specifies the fluid nodes either to include in the interface or to remove from the interface.Elements — Specifies all the fluid elements for the interface, the fluid elements to include in the interface, or the fluid elements to remove from the interface.Physical Properties — Specifies the acoustic fluid properties either to include in the interface or to remove from the interface.Nodes of Element Face — Specifies all nodes associated to a fluid element face to include in the interface, or to remove from the interface.
Fluid Nodes/Elements/Physical Properties for the Interface	Specifies the fluid entities to include or exclude.All — Specifies all the fluid elements for the interface.Specify Included Nodes/Elements/Physical Properties — Specifies the fluid nodes/elements/physical properties to include in the interface by directly selecting geometry or FE entity, or by referencing a group.Specify Excluded Nodes/Elements/ Physical Properties — Specifies the fluid nodes/elements/ physical properties to remove from the interface by directly selecting geometry or FE entity, or by referencing a group.
Structural Interface (SSET)
Structural Interface Entities	Specifies the type of entity to define the structural part of the fluid-structural interface.Nodes — Specifies the structural nodes either to include in the interface or to remove from the interface.Elements — Specifies all the structural elements for the interface, the structural elements to include in the interface, or the structural elements to remove from the interface.Physical Properties — Specifies the structural properties either to include in the interface or to remove from the interface.
Structural Nodes/Elements/Physical Properties for the Interface	Specifies the structural entities to include or exclude.All — Specifies all the structural elements for the interface.Specify Included Nodes/Elements/Physical Properties — Specifies the structural nodes/elements/physical properties to include in the interface by directly selecting geometry or FE entity, or by referencing a group.Specify Excluded Nodes/Elements/ Physical Properties —Specifies the structural nodes/elements/ physical properties to remove from the interface by directly selecting geometry or FE entity, or by referencing a group.

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Fluid-Structure Interface Modeling Parameters dialog box (Simcenter Nastran), Simcenter 3D 2021.1 Series

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