A parallel 3D computational method for fluid–structure interactions in parachute systems

Kalro, V.; Tezduyar, Tayfun E.

doi:10.1016/s0045-7825(00)00204-8

Cited by 208 publications

(85 citation statements)

References 16 publications

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“…The left-hand side terms of Equation (22) are referred to in the original configuration and the right-hand side terms in the deformed configuration at time t. From this formulation at each time step we obtain a nonlinear system of equations. In solving that nonlinear system with an iterative method, we use an incremental form (see [15,16,65,66]), which is expressed as…”

Section: Semi-discrete Formulation Of Structural Mechanicsmentioning

confidence: 99%

Arterial fluid mechanics modeling with the stabilized space–time fluid–structure interaction technique

Tezduyar

Sathe

Schwaab

et al. 2007

Numerical Methods in Fluids

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SUMMARYWe present an overview of how the arterial fluid mechanics problems can be modeled with the stabilized space-time fluid-structure interaction (SSTFSI) technique developed by the Team for Advanced Flow Simulation and Modeling (T AFSM). The SSTFSI technique includes the enhancements introduced recently by the T AFSM to increase the scope, accuracy, robustness and efficiency of this class of techniques. The SSTFSI technique is supplemented with a number of special techniques developed for arterial fluid mechanics modeling. These include a recipe for pre-FSI computations that improve the convergence of the FSI computations, using an estimated zero-pressure arterial geometry, and the sequentially coupled arterial FSI (SCAFSI) technique. The recipe for pre-FSI computations is based on the assumption that the arterial deformation during a cardiac cycle is driven mostly by the blood pressure. The SCAFSI technique, which was introduced as an approximate FSI approach in arterial fluid mechanics, is also based on that assumption. The need for an estimated zero-pressure arterial geometry is based on recognizing that the patient-specific image-based geometries correspond to time-averaged blood pressure values. In our arterial fluid mechanics modeling the arterial walls can be represented with the membrane or continuum elements, both of which are geometrically nonlinear, and the continuum element is made of hyperelastic (Fung) material. Test computations are presented for cerebral and abdominal aortic aneurysms, where the arterial geometries used in the computations are close approximations to the patient-specific image-based data.

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Section: Semi-discrete Formulation Of Structural Mechanicsmentioning

confidence: 99%

Arterial fluid mechanics modeling with the stabilized space–time fluid–structure interaction technique

Tezduyar

Sathe

Schwaab

et al. 2007

Numerical Methods in Fluids

Self Cite

155

145

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show abstract

“…Agreement between the simulation results and measurements was very good. Results from this validation study are given in Reference [11].…”

Section: Summary Of Resultsmentioning

confidence: 99%

“…[9][10][11][12][13] The T-10 is a "flat extended skirt canopy" composed of a 35-foot diameter (D c ) canopy and 30 suspension lines each 29.4 feet long. The canopy is called a "flat extended skirt canopy" because in its constructed (or nonstressed) configuration it is composed of a main circular section with a circular vent at the apex and an inverted fiat ring section, which lies under the main section and is connected to the main section at the outer radius.…”

Section: T-10 Parachute Applicationsmentioning

confidence: 99%

Simulation and Modeling of Wind Effects on Airdrop Systems

Accorsi¹,

Leonard²,

Tezduyar³

2001

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the maintaining the data needed, and completing and reviewing this collection of information. • A rigorous method is needed to model the loss of tension in fabric membrane structures such as parachute canopies. Fabric structures do not support compressive stresses and undergo "wrinkling" at the onset of compression. Since the behavior of a structure will differ dramatically depending on whether there is compression or no-compression, it is necessary to account for wrinkling in parachute systems. SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES)10• Special CSD models are needed to model Pneumatic Muscle Actuators (PMAs) for simulation of NWV candidate systems. PMAs are the primary control device being used in the NWV PAD program. PMAs utilize a braided fiber cylinder that undergoes large relative motions under rapid pressurization. A geometrically nonlinear formulation for PMAs is required.• Stand-alone CSD simulations are needed to verify the structural model and to provide a preliminary modeling capability for candidate NWV systems. Standalone CSD simulations with approximate fluid loads (prescribed pressure and velocity dependent drag) Computational Fluid Dynamics• A robust fluid dynamics model is required to simulate flow fields that involve moving boundaries and interface. For the CFD model, it is necessary to solve the time-dependent, 3D Navier-Stokes equations for incompressible flow. Additionally, the CFD model must account for the moving boundary corresponding to the parachute canopy.• Sophisticated mesh generation algorithms are needed to automatically generate and update the CFD mesh with moving boundaries and interfaces. As the parachute system deforms and travels through the fluid medium, the fluid mesh must conform to the moving boundary.• Computational methods are needed to simulate the effects of adverse wind fields on parachute systems. The CFD model must also include a general method to prescribe wind conditions on the parachute model.• Stand-alone CFD simulations are needed to verify the fluid dynamics model. To verify the CFD model, stand-alone simulations are performed with prescribed structural geometry. Fluid-Structure Interaction• A robust method is required to couple the CSD and CFD to perform FSI simulations. FSI simulations require the interchange of data between the CSD and CFD models. Specifically, the CSD model must pass the structural displacements and velocities to the CFD model and the CFD model must pass the fluid pressures to the CFD model. This data interchange occurs for each time step and an iterative coupling scheme is required to insure convergence of the FSI model. SUMMARY OF RESULTSThe goal of this project has been to develop computational tools for the simulation of candidate airdrop systems for the New World Vistas (NWV) Precision Airdrop (PAD) program. To achieve this goal, the following results were completed:• The CSD, CFD, and FSI models were form...

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“…Most of the calculations done in these models require parallel computing and can't be adapted in to a real time model. One example for such a model is a parallel 3D computational method for fluid-structure interactions in parachute systems, suggested by Vinay Kalro and T.E.Tezduyar [9]. Fig.…”

Section: Simulation Architecturementioning

confidence: 99%

A Real-Time 6DOF Computational Model to Simulate Ram-Air Parachute Dynamics

Gunasinghe¹,

Dias²,

Sandaruwan³

et al. 2017

IJITCS

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Abstract-Computer simulations are used in many disciplines as a methodology of mimicking behaviors of a physical system or a process. In our study we have developed a real-time six degree-of-freedom (6DOF), computational model that can replicate the dynamics of a ram-air parachute system which is the design of parachute that is widely used by the militaries worldwide for parachute jumps. The proposed model is expected to be adapted in to a real-time visual simulator which would be used to train parachute jumpers. A statistical evaluation of the proposed model is done using a dataset taken from NASA ram-air parachute wind tunnel test.

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A parallel 3D computational method for fluid–structure interactions in parachute systems

Cited by 208 publications

References 16 publications

Arterial fluid mechanics modeling with the stabilized space–time fluid–structure interaction technique

Arterial fluid mechanics modeling with the stabilized space–time fluid–structure interaction technique

Simulation and Modeling of Wind Effects on Airdrop Systems

A Real-Time 6DOF Computational Model to Simulate Ram-Air Parachute Dynamics

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