A general assumption in performing vortex-induced vibration (VIV) analysis of pipeline free spans is that both ends of the free span are fixed and/or pinned in order to simplify computational simulations however, Det Norske Veritas (DNV – translation to The Norwegian Truth) Recommended Practice F105 states that these boundary conditions must adequately represent the pipe-soil interaction and the continuality of the pipeline. In this exercise, we also discuss how to define the volume fraction for an Eulerian part, use the dynamic explicit solver, and finally analyze the results.The objective of this thesis is to develop a more realistic numerical model than current methodologies for free span stability of submarine pipelines based on fatigue analysis. You should know, these types of elements are not necessarily filled with matter and may only belong to a part of the space. In this analysis and simulation, we use Eulerian-Lagrangian elements.

In this workshop, we analyzed the movement of water inside the flash tank. Complete how to create an Eulerian-Lagrangian space, how to define the volume fraction for an Eulerian material, how to define the initial velocity for a soda can, use a dynamic explicit solver, and finally view the results of stresses, velocities, and other outputs you can learn in this workshop. In this workshop, we analyze the falling of a soda can on the ground in a Lagrangian-Eulerian space. For more information, you can use this link. In Lagrangian analysis, the nodes are fixed on the material and the elements are deformed by deforming the whole material, but in the Eulerian method, the nodes are fixed in space and do not deform with the deformation of our material elements, so the boundary of the elements is on the boundary of Eulerian material, In general, it does not match. “SPH in Abaqus: the package is available in this link. It should be mentioned, other methods like SPH are also used to simulate liquid and a structure. Because this method allows us to simulate completely physically or the interaction between a liquid and a structure. The most important feature of this simulation method is its easy use of General Contact explicit in Abaqus.

Simulations performed in this way are called CEL in Abaqus. Using a Lagrangian-Eulerian contact, Eulerian materials can come into contact with Lagrangian elements.

Abaqus cel fsi