Contact_surface
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Data Structure: Contact_surface |
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Description |
Contact surface data structure |
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Contact_surface NUM=ival where ival is the data structure number |
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Overview A contact surface corresponds to a single geometry set or part geometry set and is internally generated, so in general, does not need to be defined in the data file by the user. However, it can be defined in the data file if the user wishes to: •Define specific contact properties to the contact surface. •Establish priorities in the contact properties being used when different contact surfaces are assigned different properties. •Define surfaces which can interact (establish contact) with the current surface. This is useful to exclude interaction with other contact surfaces that have been included in the same contact set. If a contact surface is not defined then the contact properties will either correspond to the properties assigned to the contact set, or the specific properties assigned to entities; e.g. part geometry lines.
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 | Name Name of the contact property surface |
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Name of the contact surface (maximum of 32 characters). The contact surface name must correspond to either a geometry set name or a part geometry set name.
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| Description Description of contact surface |
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Description of contact surface (maximum of 128 characters).
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| Property_name Contact property set name |
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Name of Contact_property data structure defining the contact properties for the surface.
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| Property_number Contact property set number |
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ID number of Contact_property data structure defining the contact properties for the surface.
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| Property_priority_number Contact property priority number |
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Property_priority_number assigns a priority as to whether the contactor or target properties should be used. The selection is based on: •If the priority for the contactor and target are identical then the contactor properties will be used. •Otherwise the properties of the surface with highest priority number will be used.
Notes •By default the Property_priority_number is set to zero for all meshed geometry. •By default the Property_priority_number is set to 100 for all part geometry entities that are assigned a contact property.
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| Dual_search_flag Dual contact search flag |
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Defines whether this surface should be searched for one-way or dual contact. Valid values are: • 0 - Dual search ON (DEFAULT) • 1 - Dual search OFF
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| Self_contact_flag Self contact search flag |
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Defines whether this surface should be searched for self contact. Valid values are: • 0 - Self contact OFF (DEFAULT) • 1 - Self contact ON
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| Surface_interaction List of surfaces that may interact with the current surface |
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List of surfaces and geometry sets that define contact surfaces that may interact with the current surface. By default the surface may interact with all surfaces in any geometry set included in the same contact set.
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| Corner_projection_size Size of corner back projection (for dense systems) |
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Corner_projection_size defines the length of the back projection of the contact point when assessing whether a point overhanging a convex target corner should remain in contact. Corner_projection_size is specified as a fraction of the target facet length and is generally a small number with the default value being 0.03.
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| Corner_region_size Size of corner region (for dense systems) |
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Corner_region_size defines the size of the zone adjacent to the target facet nodes that should be treated as a potential contactor - > facet corner point contact. Corner_region_size is specified as a fraction of the target facet length and the allowable range is 0.0 < Corner_region_size < 0.1, with the default value being 0.02. The default value is generally recommended and larger values should be used with caution.
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| Corner_angle_tolerance Size of corner angle tolerance (for dense systems) |
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The corner angle tolerance is used to define whether a contact point should be treated as being part of a smooth surface or a sharp corner. The point is treated as a sharp corner if the angle between the facet normal exceeds Corner_angle_tolerance. The default value of the corner angle tolerance is 45 Degrees.
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| Thermal_advection_flag Include thermal convection terms |
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Defines whether thermal advection is considered. Valid values are: • 0 - Do not include advection terms • 1 - Include advection stiffness terms with Petrov Galerkin streamline upwinding (default) • 2 - Include advection terms without Petrov Galerkin streamline upwinding • 3 - Include advection stiffness and storativity terms with Petrov Galerkin streamline upwinding
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