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Welcome to this Ansys How To Series video. We see many real-world examples around us that can be solved using Ansys Mechanical. They can often involve large assemblies with many parts, interacting with each other to produce a desired output. For such complex models, even if the contacts are all linear, a static solution still might fail if the initial contact conditions are not set up properly. Engineers need to be extra cautious when setting up the contacts between the parts, generating the desired mesh, setting up the boundary conditions, applying loads, and finally solving it. And after solving such complex problems, what if it fails due to improper contacts with bodies having rigid body motion? Could that be avoided before investing computational time? Is there a way to check how these contacts are defined prior to solving? Well, we will answer all these questions in this video. Are you ready? Let’s go. For practical engineering simulation scenarios, there are often different teams involved at various stages of the product cycle. It may be quite possible that the geometry of the engineering problem is created by others. And they may not be aware of the details and validations required for setting up a simulation problem. There can be geometric gaps and interferences in the model and such unwanted or wanted details may not be easily noticeable when you set up the analysis, especially contacts between various interconnected parts. Here is one example where we have a small gap at one location as well as interference at another location. When such contacts remain unattended, they can create convergence trouble during the solve. And for a large-scale engineering problems, if it fails after a long solution time, it is a waste of not only computational resources but also of your valuable time. If we don’t check the initial contact conditions carefully before solving the case, we may end up with the results that are far off from expectations or perhaps we get no results at all if the static analysis fails due to rigid body motion. For dynamic analysis, we include inertial effects, so we can capture rigid body motion if necessary. For example, a drop test simulation of a smartphone to the floor. However, in a static analysis, rigid body motion is mathematically problematic because the matrix becomes singular, which implies that there is no unique solution. Such rigid body motion is typically caused when the bodies are not constrained properly. And in cases where parts are held together exclusively by contact, we must ensure that such parts are initially touching without gaps. However, gaps are not the only issue, we may also have initial penetration between contacting pairs. In such cases, the contact forces might be overestimated resulting in convergence trouble. Thus, checking the initial contact is perhaps the most important aspect of analyzing an assembly with contact. Therefore, we should always use the “Contact Tool” under the “Connections” branch before solving to verify the initial contact status. The “Contact...