Recent development of a coupled CFD/CSD methodology using an embedded approach
A new algorithm for modeling the response of structures to severe airblast and fragment loading, including the modeling of large plastic deformations, structural failure and break-up, is described in this paper. The coupled Computational Fluid Dynamics (CFD) and Computational Structural Dynamics (CSD) methodologies required to describe these phenomena include the FEFL098 flow solver and DYNA3D structural solver. The original coupling between the two domains was based on the so-called “glued-mesh” approach, where the CFD and CSD interfaces match. Recent failure of this approach to model severe structural deformation, as well as crack propagation in steel and concrete, led us to the development and use of the “embedded-mesh” approach. Here, the CSD objects float through the CFD domain. While each approach has its own advantages, limitations and deficiencies, the embedded approach was proven to be superior for the problems modeled here. Critical applications of both approaches are described, including weapon detonation and fragmentation, airblast interaction with a reinforced concrete wall, and fragment/airblast interaction with a steel wall. The final applications model the interaction of an external airblast with a generic steel ship hull and a generic multi-chamber steel tower.
KeywordsComputational Fluid Dynamics Reinforced Concrete Wall Generic Ship Embed Approach Computational Structural Dynamics
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- 1.J.D. Baum, H. Luo, R. Löhner, C. Yang, D. Pelessone, C. Charman: A coupled fluid/structure modeling of shock interaction with a truck. AIAA 96-0795 (1996)Google Scholar
- 2.J. D. Baum, et al.: ‘A Recent Developments of a Coupled CFD/CSD Methodology’. AIAA 2001–2618, In: Proc. 15th AIAA CFD Conf. Anaheim, CA, 2001 Google Scholar
- 6.D. Pelessone, C.M. Charman: ‘A General Formulation of a Contact Algorithm with Node/Face and Edge/Edge Contacts’. In: 1998 ASME Pressure Vessels and Piping Con ference, San Diego, Ca, July, 1998 Google Scholar
- 7.D. Pelessone, CM. Charman, R. Löhner, J.D. Baum: A new crack propagation algorithm for modeling weapon fragmentation, in preparationGoogle Scholar
- 8.R.G. Whir ley, J.O. Hallquist: DYNA3D, A nonlinear explicit, three-dimensional finite element code for solid and structural mechanics — user manual. UCRL-MA-107254 (1991), also Comp. Meth. Appl. Mech. Eng. 33, 725 (1982)Google Scholar