Fluid Structure Interaction for Immersed Bodies
A new method for automatically constructing the coupling surface along shell edges is developed. By using this new "edge" option together with "shell thickness" option in the *CONSTRAINED_LAGRANGE_IN_SOLID card, we can accurately model problems involving shell structures with leading edges cutting into ALE materials. Engineering problems include bird striking at propulsion system fan blades; helicopter impacting water. This new feature is implemented in the latest LS-DYNA 971 release 7600 and ready to use with minor input deck modifications. Before, in order to correctly model the FSI, blades had to be meshed by using Lagrange solid elements. This approach can ensure an accurate coupling interface but the time step size is greatly reduced due small element sizes. The lengthy running time for the problem makes this approach impractical. The new "edge" and "thickness" feature will construct a proper coupling surface from shell elements and provide reasonable time step sizes for the simulations.
https://www.dynalook.com/conferences/european-conf-2007/fluid-structure-interaction-for-immersed-bodies.pdf/view
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Fluid Structure Interaction for Immersed Bodies
A new method for automatically constructing the coupling surface along shell edges is developed. By using this new "edge" option together with "shell thickness" option in the *CONSTRAINED_LAGRANGE_IN_SOLID card, we can accurately model problems involving shell structures with leading edges cutting into ALE materials. Engineering problems include bird striking at propulsion system fan blades; helicopter impacting water. This new feature is implemented in the latest LS-DYNA 971 release 7600 and ready to use with minor input deck modifications. Before, in order to correctly model the FSI, blades had to be meshed by using Lagrange solid elements. This approach can ensure an accurate coupling interface but the time step size is greatly reduced due small element sizes. The lengthy running time for the problem makes this approach impractical. The new "edge" and "thickness" feature will construct a proper coupling surface from shell elements and provide reasonable time step sizes for the simulations.
4.1.2.pdf
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