An algorithm for modelling the interaction of a flexible rod with a two-dimensional high-speed flow

Tam, Daniel; Radovitzky, Raúl; Samtaney, Ravi

doi:10.1002/nme.1397

Cited by 11 publications

(8 citation statements)

References 35 publications

(54 reference statements)

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“…In the case of inviscid flows considered here, these boundary conditions correspond-in the Lagrangian notation of Sect. 3, [14]-to the continuity of the normal component of the velocity field:…”

Section: Fluid-structure Couplingmentioning

confidence: 99%

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A virtual test facility for the efficient simulation of solid material response under strong shock and detonation wave loading

Deiterding

Radovitzky

Mauch

et al. 2006

Engineering with Computers

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A virtual test facility (VTF) for studying the three-dimensional dynamic response of solid materials subject to strong shock and detonation waves has been constructed as part of the research program of the Center for Simulating the Dynamic Response of Materials at the California Institute of Technology. The compressible fluid flow is simulated with a Cartesian finite volume method and treating the solid as an embedded moving body, while a Lagrangian finite element scheme is employed to describe the structural response to the hydrodynamic pressure loading. A temporal splitting method is applied to update the position and velocity of the boundary between time steps. The boundary is represented implicitly in the fluid solver with a level set function that is constructed on-the-fly from the unstructured solid surface mesh. Block-structured mesh adaptation with time step refinement in the fluid allows for the efficient consideration of disparate fluid and solid time scales. We detail the design of the employed object-oriented mesh refinement framework AMROC and outline its effective extension for fluid-structure interaction problems. Further, we describe the parallelization of the most important algorithmic components for distributed memory machines and discuss the applied partitioning strategies. As computational examples for typical VTF applications, we present the dynamic deformation of a tantalum cylinder due to the detonation of an interior solid explosive and the impact of an explosion-induced shock wave on a multi-material soft tissue body.

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Section: Fluid-structure Couplingmentioning

confidence: 99%

“…An extension of the basic, non-adaptive fluid-solid coupling algorithm used herein to thin, open structures has recently been presented in [14]. In Sect.…”

Section: Introductionmentioning

confidence: 99%

A virtual test facility for the efficient simulation of solid material response under strong shock and detonation wave loading

Deiterding

Radovitzky

Mauch

et al. 2006

Engineering with Computers

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“…Data belonging to another test is included only to give an idea about costs. The test is a fluid-structure interaction problem known as Radovitzky test [34]. It is a supersonic flow flowing over an elastic plate with very large deformations, therefore the robustness of the mesh motion method is very crucial.…”

Section: Maximum Channel Blockage: 99%mentioning

confidence: 99%

A minimal element distortion strategy for computational mesh dynamics

López

Nigro

Storti

et al. 2006

Numerical Meth Engineering

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Mesh motion strategy is one of the key points in many fluid-structure interaction (FSI) problems. Due to the increasing application of FSI to solve the current challenging engineering problems, this topic has become of great interest. There are several different strategies to solve this problem, some of them use a discrete and lumped spring-mass system to propagate the boundary motion into the volume mesh, and many others use an elastostatic problem to deform the mesh. In all these strategies there is always risk of producing an invalid mesh, i.e. a mesh with some elements inverted. Normally this condition is irreversible and once an invalid mesh is obtained it is difficult to continue.In this paper the mesh motion strategy is defined as an optimization problem. By its definition this strategy can be classified as a particular case of an elastostatic problem where the material constitutive law is defined in terms of the minimization of certain energy functional that takes into account the degree of element distortion. Some advantages of this strategy are its natural tendency to high quality meshes, its robustness and its straightforward extension to 3D problems. Several examples included in this paper show these capabilities.Even though this strategy seems to be very robust it is not able to recover a valid mesh starting from an invalid one. This improvement is left for future work. Figure 20. Deformed mesh.Non-slip boundary conditions were imposed at the channel walls. The mesh used has 12K triangular elements and 6.7K nodes. Maximum channel blockage: 38%.In the original problem the maximum blockage of the channel is defined as 38% [33]. Figures 23-25 show the pressure, the velocity vector field and the velocity magnitude, respectively, at t * = 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 and 1.0. In these figures only the domain region downstream to the indentation is included due to the fact that the

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“…For a typical fiber/ air two-phase flow, interaction between the flexible fiber and the airflow takes place at the interface between them. Recently, an increasing number of publications dealing with FSI problems in the engineering field have appeared [13][14][15]. In this paper, a twodimensional FSI model for the fiber/air two-phase flow is presented to design the spindle parameters in vortex spinning.…”

Section: Introductionmentioning

confidence: 99%

Designing the Spindle Parameters of Vortex Spinning by Modeling the Fiber/Air Two-Phase Flow

Pei

2014

Journal of Manufacturing Science and Engineering

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Vortex spinning is a novel technology which produces short-staple yarns by utilizing high-speed swirling airflow. The structure of the spindle piays an important role in vortex spinning in terms of its effect on the resuiting yarn properties, ln this paper, a twodimensionai fluid-structure interaction (FSI) modei for the fiber/air two-phase flow is presented to design the two spindle parameters-the spindle cone angle and spindle diameter by evaluating their effects on the fiber dynamics in the flow fleld inside the tnnsting system and the resulting yarn tenacity. The coupling between the fiber and airflow is solved and the motional characteristics of the fiber are obtained. It is found that the fiber moves downstream in a varying wavy shape and its spreaded trailing portion is then in a heiical motion to form the yarn. The results also show that the increase of the spindle cone angle has a negative effect on the tenacity of the produced vortex yarn. The increased spindle diameter gives rise to the decreased vortex yarn tenacity. The numericai results can provide an explanation for the experimental results reported by previous studies.

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An algorithm for modelling the interaction of a flexible rod with a two-dimensional high-speed flow

Cited by 11 publications

References 35 publications

A virtual test facility for the efficient simulation of solid material response under strong shock and detonation wave loading

A virtual test facility for the efficient simulation of solid material response under strong shock and detonation wave loading

A minimal element distortion strategy for computational mesh dynamics

Designing the Spindle Parameters of Vortex Spinning by Modeling the Fiber/Air Two-Phase Flow

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