Fluid-Structure Interface Modeling Parameters dialog box (Noise and Vibration)

Modeling Object
Name	Sets the name of the modeling object.
Label	Sets a unique numerical identifier for the modeling object.
Properties
Description	Lets you specify a description for this modeling object. Enter a brief description or click to open a text editor, where you can enter a longer description.
Search Units	Specifies the search unit to define which elements are to be coupled.AbsoluteUses a normal line in each integration point of the structural element; the closest acoustic element within a certain distance is searched for the outward and inward specified distances.RelativeUses relative model units based on the entire structural model, and uses a scaled distance (for example, 0.2 or 0.3 times) of the entire structural model to search for acoustic elements.If no acoustic element is found within the tolerance, the elements are not coupled. If a second acoustic element on the same side is found within that tolerance, only the closest one is coupled. If the structural mesh is to be coupled on both sides, the procedure is repeated for the other side of the structural mesh. The tolerance should be large enough to couple all structural elements with the acoustic mesh, but small enough to avoid coupling structural elements that are not directly exposed to the fluid (for example, a case with a double-walled structure where the outside wall is not acoustically coupled to a cavity inside).
Outward Normal Search Distance	Specifies the distance to search in the outward normal direction to detect the fluid-structure interface.
Inward Normal Search Distance	Specifies the distance to search in the inward normal direction to detect the fluid-structure interface.
Angular Tolerance	Searches the fluid elements for which normals are within the specified tolerance. For example, if the tolerance is set to 60 degrees, the fluid elements in between 0 and 60 degrees are searched.Determines whether a fluid free face and a structural face will be coupled.The combination of the search distances and the angular tolerance finds the desired acoustic elements.Note: The software takes the absolute value of the angle between the normal of the structure and the fluid face; therefore, this value must be between 0 and 90.
Fluid Interface
Fluid Elements for the Interface	Specifies the fluid elements to include in the interface.AllIncludes all the fluid elements for the fluid interface.Specify Included ElementsIncludes a group of fluid elements for the fluid interface that you select from the fluid mesh or that you select by group reference.
Entity Selection
Appears when Fluid Elements for the Interface is set to Specify Included Elements.
Group Reference	Lets you select groups.For more information, see Group Reference options.
Select Object	Lets you select elements.
Stacked Smart Selector Methods	Opens the Smart Selector Methods dialog box where you can specify a progression of smart selection filters.For more information, see Smart Selector Methods dialog box.
Structural Interface
Structural Elements/Faces for the Interface	Specifies the structural elements or the structural entities to include in the interface.All Structural 2D ElementsIncludes all the structural 2D shell elements for the structural interface.Specify Included 2D Elements or 3D Element FacesIncludes a group of structural 2D shell elements or a group of structural 3D element faces for the interface that you select from the structural mesh or that you select by group reference.
Entity Selection
Appears when Structural Elements/Faces for the Interface is set to Specify Included 2D Elements or 3D Element Faces.
Group Reference	Lets you select groups.For more information, see Group Reference options.
Select Object	Lets you select elements or faces of elements.
Stacked Smart Selector Methods	Opens the Smart Selector Methods dialog box where you can specify a progression of smart selection filters.For more information, see Smart Selector Methods dialog box.

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

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