Hello everyone, I am a new user of Abaqus.
I try to simulate the impact between a vessel and an off-shore wind turbine for my Thesis. The wind turbine is inserted in the sea-bottom. I have a problem regarding the modeling of the interaction between the soil and the embedded part of the wind turbine.
I have modeled this interaction using non-linear connector elements according to the following link: https://simulation-blog.technia.com/simulation/subsea-modeling-with-soil-and-structure-interaction-in-abaqus-part-1
However, this type of modelling imposes a load on the embedded part of the wind turbine resulting to its movement (without any other load imposed on it). Is this normal? Could you please advise on how I can eliminate this movement, as my intention is that those connectors describe the stiffness of the soil around the embedded wind turbine, operating as a constraint?
Nonlinear connectors, also known as nonlinear springs or elements, can impose a load on a system because they have a non-linear force-displacement relationship. In contrast to linear connectors, which have a constant force-displacement relationship, the force exerted by a nonlinear connector change with displacement.
When a nonlinear connector is compressed or stretched beyond a certain point, its force-displacement relationship changes, and the connector may begin to resist further deformation by exerting an opposing force, similar to a spring. This can result in the nonlinear connector imposing a load on the system it is connected to, rather than simply operating as a constraint.
In some cases, this can be beneficial, as the nonlinear connector can be used to provide damping or absorb energy in a system. For example, in a vehicle suspension system, nonlinear shock absorbers can help to smooth out the ride by absorbing energy from bumps in the road. In other cases, however, the load imposed by a nonlinear connector may be undesirable and can lead to structural damage or failure if not properly accounted for in the design of a system.
In summary, the non-linear force-displacement relationship of a nonlinear connector can cause it to behave like a spring, imposing a load on the system it is connected to rather than simply operating as a constraint. This behaviour can be both beneficial and detrimental depending on the application and how it is designed.
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