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<p>We present a new methodology for the computational modeling of fluid–structure interaction (FSI) involving underwater explosion (UNDEX) and thin-shell structures. The FSI formulation makes use of an immersed approach and employs a simple and effective volumetric penalty coupling between the shell structures and surrounding multiphase flow. The multiphase fluid formulation is cast into a framework of stabilized methods augmented with discontinuity capturing. Both the fluid and shell structures are discretized in space using NURBS-based isogeometric analysis (IGA) and integrated in time using an explicit Generalized-<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="466_2025_2607_Article_IEq1.gif" Format="GIF" Height="10" Rendition="HTML" Resolution="72" Type="Linedraw" Width="14" /> </InlineMediaObject> <EquationSource Format="TEX">\(\alpha \)</EquationSource> <EquationSource Format="MATHML"><math> <mi>α</mi> </math></EquationSource> </InlineEquation> technique. The resulting methodology is applied to simulate the response of both aluminum and multi-layer composite shell structures. The numerical results presented are compared with experimental data to demonstrate the power of the proposed simulation methodology.</p>

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Isogeometric analysis of underwater explosion fluid–structure interaction (UNDEX-FSI)

  • 期刊论文

  • 发表日期：

    2025年2月10日

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  • Shaunak Shende,
  • Hoang Nguyen,
  • Yuri Bazilevs

摘要

We present a new methodology for the computational modeling of fluid–structure interaction (FSI) involving underwater explosion (UNDEX) and thin-shell structures. The FSI formulation makes use of an immersed approach and employs a simple and effective volumetric penalty coupling between the shell structures and surrounding multiphase flow. The multiphase fluid formulation is cast into a framework of stabilized methods augmented with discontinuity capturing. Both the fluid and shell structures are discretized in space using NURBS-based isogeometric analysis (IGA) and integrated in time using an explicit Generalized- \(\alpha \) α technique. The resulting methodology is applied to simulate the response of both aluminum and multi-layer composite shell structures. The numerical results presented are compared with experimental data to demonstrate the power of the proposed simulation methodology.