A Multidisciplinary Computational Framework for Sailing Yacht Rig Design & Optimization through Viscous FSI

2011 ◽  
Author(s):  
Vincent G. Chapin ◽  
Nolwenn de Carlan ◽  
Peter Heppel
Keyword(s):  
Optimization Problems ◽  
Fluid Structure Interaction ◽  
Evolutionary Strategies ◽  
Computational Framework ◽  
Fluid Structure ◽  
Structural Part ◽  
Design And Optimization ◽  
Structure Interaction ◽  
Derivative Free ◽  
The Right

Although competitive sailing yachts may sail fast today this is mainly due to material progress, not sail design. It is always difficult to design a set of sails for a given boat and sailing conditions. A sail has one design shape but an infinite number of corresponding flying shapes depending on materials, trimming, rigging and wind conditions. In this paper a computational framework for sail analysis, design and optimization has been extended to Fluid-Structure Interaction (FSI) and will be presented. The multi-physics computational framework is based on a viscous Computational Fluid Dynamics (CFD) solver for the fluid part and on a nonlinear structural modelling for the structural part. A loose coupling of both models has been implemented to be able to make Fluid-Structure Interaction simulations on various sail configurations and to investigate the relation between a design shape and its corresponding flying shapes. The computational framework presented also contains an optimization package based on derivative free evolutionary strategies to address complex, nonlinear optimization problems. It will be used on few examples of sail design questions to illustrate how it may contribute to put some rational elements in a rather frequently passionate discussion between sailors, sail designers, naval architects and amateurs to design the right set of sails for a given boat.

Mechanical research on aerostatic guideways in consideration of fluid-structure interaction

2019 ◽  
Vol 72 (3) ◽  
pp. 285-290 ◽  
Author(s):  
Ruzhong Yan ◽  
Liaoyuan Wang ◽  
Shengze Wang
Keyword(s):  
Mechanical Properties ◽  
Peer Review ◽  
Fluid Structure Interaction ◽  
Small Deformation ◽  
Structural Deformation ◽  
Fluid Structure ◽  
Content Type ◽  
Design And Optimization ◽  
Structure Interaction ◽  
Deformation Law

Purpose The purpose of this paper is to study the mechanical properties of aerostatic guideway taking the structural deformation into account, and further improve the calculation method of guideway. Design/methodology/approach A theoretical model of fluid-structure interaction for the numerical simulation was established and mechanical properties of the aerostatic guideway with porous restrictors were solved based on computational fluid dynamics. The deformation law of the guideway with different materials and gas-film thicknesses was revealed, and its static and dynamic characteristic curves were obtained. Findings The results indicate that ceramics as the material of guideways exhibit good applicability due to the small deformation, the quick dynamic response and the relatively light weight. The rational initial gas-film of guideway is recommended. Originality/value The present work can provide ideas for the design and optimization of aerostatic guideways. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-07-2019-0288

Numerical Evaluation of Deformation and Stress in Impellers of Multistage Pumps by Means of Fluid Structure Interaction

2013 ◽  
Author(s):  
Andreas Schneider ◽  
Björn-Christian Will ◽  
Martin Böhle
Keyword(s):  
Numerical Evaluation ◽  
Fluid Structure Interaction ◽  
Hydrodynamic Pressure ◽  
Operational Reliability ◽  
Operating Conditions ◽  
Design Parameters ◽  
Centrifugal Pumps ◽  
Fluid Structure ◽  
Structural Part ◽  
Structure Interaction

The operational reliability of centrifugal pumps strongly depends on an adequate structural design of every single component. Therefore, the design process requires trustworthy information about the expected stresses and deformations. The numerical evaluation of the deformations and the stresses in the impellers of multistage centrifugal pumps is the topic of this report. The loads acting on the impeller under operating conditions can be subdivided into structural and hydrodynamic components, which are considered by means of one-way coupled fluid-structure interaction (FSI) simulations. For the investigations, an exemplary multistage pump with a specific speed of nq = 30 has been chosen. The hydrodynamic pressure loads on the impeller are derived from the CFD solution for a single stage of the pump. These pressure loads are imposed on the impeller in the structural part of the simulation. In order to determine the resulting deformations and stresses of the impeller, static structural analyses are performed. Different operating conditions, i.e. flow rates and temperatures, are analyzed. Furthermore, the influence of structural impeller design parameters on the resulting deformations and stresses is investigated in detail. The thickness of the impeller shrouds as well as the fillet radii between the blades and the shrouds are considered as design parameters.

Abstract 14381: Patient-specific Fluid Structure Interaction Simulations of Anomalous Origins of Right Coronary Arteries in Adults Correlate With Measured Instantaneous Wave-free Ratio

Circulation ◽  
2020 ◽  
Vol 142 (Suppl_3) ◽  
Author(s):  
Michael X Jiang ◽  
Muhammad O Khan ◽  
Joanna Ghobrial ◽  
Ian S Rogers ◽  
Eugene H Blackstone ◽  
...  
Keyword(s):  
Risk Stratification ◽  
Fluid Structure Interaction ◽  
Dobutamine Stress ◽  
Stress Perfusion ◽  
Patient Specific ◽  
Fluid Structure ◽  
Stress Perfusion Imaging ◽  
Structure Interaction ◽  
Asymptomatic Individuals ◽  
The Right

Introduction: Anomalous coronaries are associated with ischemia and sudden death, but the recommendation to undergo surgery is often uncertain, especially for asymptomatic individuals with an anomalous aortic origin of the right coronary artery (AAORCA). For risk stratification, dobutamine-stress instantaneous wave-free ratio (iFR) is increasingly used. Meanwhile, advances in fluid-structure interaction (FSI) modeling have enabled the simultaneous simulation of blood flow and tissue deformation that may elucidate the mechanism of ischemia in AAORCA. Hypothesis: We hypothesized that the iFR simulated by patient-specific FSI models of AAORCA correlates with the measured iFR at rest and dobutamine-stress, and the hemodynamic mechanism is mainly due to the intramural geometry. Methods: Using the Simvascular software package, we constructed 6 FSI models of the AAORCA which encompassed the aortic root, the intramural course (if present), and coronary outlets coupled to lumped parameter networks that included the dynamic microvascular compression. Each model was customized to the patients’ computed tomography angiography, vitals, and cardiac output. Results: All 6 AAORCAs had an interarterial course, and all but one had an intramural course. Measured iFRs ranged from 0.98 to 0.95 at rest, and from 0.95 to 0.80 with dobutamine-stress. The FSI model yielded realistic pressures and flows waveforms (Fig. 1). After we tuned the resistances to achieve flow rates at stress to be triple those at rest, the FSI simulations adequately matched the measured iFR (r = 0.85, RMSE = 0.04). Conclusions: Patient-specific FSI modeling is a promising non-invasive tool to assess the hemodynamic effects of AAORCA including the intramural course. However, the iFR’s sensitivity to the flow rate suggests a future role for quantitative stress-perfusion imaging to augment the iFR measurements for AAOCA risk stratification.

An adjoint-based method for the numerical approximation of shape optimization problems in presence of fluid-structure interaction

2018 ◽  
Vol 52 (4) ◽  
pp. 1501-1532
Author(s):  
Andrea Manzoni ◽  
Luca Ponti
Keyword(s):  
Shape Optimization ◽  
Optimization Problems ◽  
Fluid Structure Interaction ◽  
Optimal Solution ◽  
Model Potential ◽  
Adjoint Problem ◽  
Elastic Channel ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Unsteady Stokes Flow

In this work, we propose both a theoretical framework and a numerical method to tackle shape optimization problems related with fluid dynamics applications in presence of fluid-structure interactions. We present a general framework relying on the solution to a suitable adjoint problem and the characterization of the shape gradient of the cost functional to be minimized. We show how to derive a system of (first-order) optimality conditions combining several tools from shape analysis and how to exploit them in order to set a numerical iterative procedure to approximate the optimal solution. We also show how to deal efficiently with shape deformations (resulting from both the fluid-structure interaction and the optimization process). As benchmark case, we consider an unsteady Stokes flow in an elastic channel with compliant walls, whose motion under the effect of the flow is described through a linear Koiter shell model. Potential applications are related e.g. to design of cardiovascular prostheses in physiological flows or design of components in aerodynamics.

Validation of Computational Fluid Structure Interaction Models for Shape Optimization Under Blast Impact

2010 ◽  
Author(s):  
Huade Tan ◽  
John Goetz ◽  
Andre´s Tovar ◽  
John E. Renaud
Keyword(s):  
Optimization Problems ◽  
Fluid Structure Interaction ◽  
Fluid Structure Interactions ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Blast Energy ◽  
Interaction Simulation ◽  
Fully Coupled ◽  
Structural Optimization Problem ◽  
Interaction Problem

A first order structural optimization problem is examined to evaluate the effects of structural geometry on blast energy transfer in a fully coupled fluid structure interaction problem. The fidelity of the fluid structure interaction simulation is shown to yield significant insights into the blast mitigation problem not captured in similar empirically based blast models. An emphasis is placed on the accuracy of simulating such fluid structure interactions and its implications on designing continuum level structures. Higher order design methodologies and algorithms are discussed for the application of such fully coupled simulations on vehicle level optimization problems.

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