Hydrodynamic ram modeling with the immersed boundary method

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Description

The authors have modeled a hydrodynamic ram experiment conducted at Wright-Patterson Air Force Base. In the experiment, a projectile traveling at 200 ft/sec impacted and penetrated a simulated airplane wing containing water. The structure consisted of composite panels with stiffeners and rivets, and an aluminum panel. The test included instrumentation to measure strains, accelerations, and pressures. The technique used for modeling this experiment was a multifluid compressible finite volume approach. The solid fields, namely the projectile and the plates which comprised the structure, were represented by a set of discrete, Lagrangian-frame, mass points. These mass points were followed throughout the ... continued below

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12 p.

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Lewis, M.W.; Kashiwa, B.A. & Rauenzahn, R.M. March 1, 1998.

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Description

The authors have modeled a hydrodynamic ram experiment conducted at Wright-Patterson Air Force Base. In the experiment, a projectile traveling at 200 ft/sec impacted and penetrated a simulated airplane wing containing water. The structure consisted of composite panels with stiffeners and rivets, and an aluminum panel. The test included instrumentation to measure strains, accelerations, and pressures. The technique used for modeling this experiment was a multifluid compressible finite volume approach. The solid fields, namely the projectile and the plates which comprised the structure, were represented by a set of discrete, Lagrangian-frame, mass points. These mass points were followed throughout the computation. The contribution of the stress state at each mass point was applied on the grid to determine the stress divergence contribution to the equations of motion and resulting grid based accelerations. This approach has been defined as the immersed boundary method. The immersed boundary method allows the modeling of fluid-structure interaction problems involving material failure. The authors implemented a plate theory to allow the representation of each plate by a surface of mass points. This theory includes bending terms and transverse shear. Arbitrary constitutive models may be used for each plate. Here they describe the immersed boundary method as they have implemented. They then describe the plate theory and its implementation. They discuss the hydrodynamic ram experiment and describe how they modeled it. They compare computed results with test data. They finally conclude with a discussion of benefits and difficulties associated with this modeling approach and possible improvement to it.

Physical Description

12 p.

Notes

OSTI as DE98005042

Source

  • 1998 ASME/JSME joint pressure vessel and piping (PVP) conference, San Diego, CA (United States), 26-30 Jul 1998

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  • Other: DE98005042
  • Report No.: LA-UR--97-4873
  • Report No.: CONF-980708--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 650370
  • Archival Resource Key: ark:/67531/metadc707327

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  • March 1, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 21, 2016, 10:20 p.m.

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Lewis, M.W.; Kashiwa, B.A. & Rauenzahn, R.M. Hydrodynamic ram modeling with the immersed boundary method, article, March 1, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc707327/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.