Simulation > Creo Ansys Simulation > Connections > Contacts in Creo Ansys Simulation
Contacts in Creo Ansys Simulation
Creo Ansys Simulation enables you to create contacts between references within your model either manually or automatically. You can create contacts between surfaces, edges, and vertices. The way that the references in contact behave (staying connected, sliding, or separating) during a simulation study is called contact behavior. For a thermal study you can create thermal contact behavior to account for the conductive heat transfer between surfaces in contact. You can create contacts within your model using the following methods:
Automatically Detect Contacts when Defining a New Simulation Study
When you create a new simulation study the Use automatic contacts detection check box is selected by default. The software detects all the surfaces between solid bodies that are within a predefined distance of each other. Contacts detected using this method are automatically assigned a bonded contact behavior and available on the Simulation Tree under the Contacts node and the Bonded sub-node for the simulation study. You can edit or remove the contacts as required. Note that self contacts (contacts within the same body or component or a curved surface curving onto itself) are not detected using this method. Contacts between non-solid references are also not detected with this method.
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If the model geometry changes after creating a study with the Use automatic contacts detection check box selected, you can use the command Refine Model > Contact > Detect Contacts to detect all contacts in that study again as new contacts may be introduced, or the previously detected contacts could be out-of-date, no longer valid.
Automatically Detect Contacts by Selecting References
The software can also automatically detect contacts between two or more selected solid bodies or components that are within a specified distance from each other for the active simulation study.
To automatically detect contacts in your model for an active simulation study perform the following steps:
1. Click Refine Model > Contact > Detect Contacts. The Auto-Detect Contacts dialog box opens.
2. Select solid components or bodies in the model. Your selections are displayed in the References collector.
3. The Tolerance box displays a default value that is automatically calculated based on the model geometry. Change this value to specify the distance within which you want to detect contacts. Click revert button if you want to revert to using the default value.
4. Select one of the following options for Contact behavior:
◦ Bonded—There is no separation or sliding allowed between references that are in contact. Bonded contacts have zero degrees of freedom between interfacing components and can be considered as glued together. Bonded components do not separate from each other during a simulation study.
◦ No separation—Similar to bonded contacts, separation of the components in contact is not allowed during a simulation study. However small amounts of frictionless sliding can occur along references in contact.
This option is not available for thermal studies.
◦ For a thermal study, you can also select a previously created thermal contact behavior from the Contact behavior list or select Create new from the Contact behavior list if you want to define a custom thermal contact behavior. Specify a name for the contact behavior or use the default.
Specify a positive value, a parameter, or an expression that evaluates to a positive value for Conductance. Select units of conductance. You can also select a previously created thermal contact behavior from the Contact behavior list.
5. Click OK. Contacts that meet the specified tolerance criteria are created and appear under the contact behavior subnode of the Contacts node in the Simulation Tree.
Creating Contacts Manually
You can manually create contacts between two references in your model . To create a contact manually perform the following steps:
1. Click Refine Model > Contact.
2. The Contact Definition dialog box opens.
3. Specify a name or use the default. Optionally, click the color swatch adjacent to the Name box to change the color of the icon, the distribution, or the text displayed.
4. Select a surface, an edge, a curve, or a vertex in the First reference collector.
5. Select a surface, an edge, a curve, or a vertex in the Second reference collector.
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You can create contacts for the same reference by selecting the same reference in both the First reference and the Second reference collectors.
6. Select one of the following options from the Contact behavior list:
◦ Bonded—There is no separation or sliding allowed between references that are in contact. Bonded contacts have zero degrees of freedom between interfacing components and can be considered as glued together. Bonded components do not separate from each other during a simulation study.
◦ No separation—Similar to bonded contacts, separation of the references in contact is not allowed during a simulation study. However small amounts of frictionless sliding can occur along references in contact.
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This option is not available for thermal studies.
◦ For a thermal study you can also select a previously created thermal contact behavior from the Contact behavior list, or click Create new if you want to define a custom thermal contact behavior. Specify a name for the contact behavior or use the default.
Specify a positive value, a parameter, or an expression for Conductance. Select units of conductance.
◦ Click OK to define the contact.
Creating Contact Behavior for Thermal Studies
To consider the conductive heat transfer between surfaces in contact, you can specify the thermal contact conductance for a contact behavior. Thermal contact conductance must have a value greater than 0. You can create a contact behavior up-front and use it when defining contacts later.
Perform the following steps to create a thermal contact behavior:
1. Click Refine Model > Contact > Contact Behavior. The Thermal Contact Behavior dialog box opens.
2. Specify a name for the contact or accept the default name.
3. Specify a positive value, a parameter, or an expression that evaluates to a positive value for Conductance. Select units for conductance.
4. Click OK to create and save the contact behavior. The contact behavior is displayed in the Simulation Tree and is the parent node of any contacts that use it.