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Solid & Fluid and Two Separate Fluids & Solids

Virtual Product Development can use multi-physics simulation such as Fluid-Structure Interaction - FSI - including multi-fluid systems.  Here we present two examples of FSI.  In the first model a high velocity projectile is fired at a stationary target while the second simulation involves two seperate fluids along with their interaction with flexible and rigid structures.  Fluid-Structure Interaction (FSI) multiphysics problems can capture very complex interactions and provide multi-level data for both the structures and the fluids.

The modeling technique used in these Fluid-Structure Interaction (FSI) simulations is the Arbitrary Lagrangian-Eulerian (ALE) method.  The ALE method consists of a Lagrangian (structural) step followed by a remap, or advection, Eulerian (fluid) step.  In this way the simulation sequentially accounts for the interaction of a structure with a fluid.

In the first ALE simulation shown here, the projectile (structural component) has elastic-plastic material behavior allowing for large plastic deformations in the projectile as it impacts the target.  The target is a block of liquid water modeled with an Equation of State (EOS). The second simulation involves two EOS's, one for each fluid.  The structural componets consist of a non-linear elastic "funnel" as well as a rigid plate.  Contact is maintained in each of the models across all the components.

The results of the high velocity impact simulation show fragmentation of the target along with severe plastic deformation of the projectle.  This model is relatively simple however, it demonstrates the power and ability of the ALE Fluid-Structure Interaction simulation method to capture complex behavior.

In another example Fluid-Fluid interaction is demonstrated along with the Fluid-Structure interaction (FSI).  The result shown in the animation of the second model indicate there is very little to no mixing occurring between the fluids despite the interactions with the structural components.