Mesh moving techniques in fluid-structure interaction: robustness, accumulated distortion and computational efficiency

Shamanskiy, Alexander; Simeon, Bernd

doi:10.1007/s00466-020-01950-x

Cited by 36 publications

(27 citation statements)

References 34 publications

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“…This is only the simplest choice out of a wide variety of proposed methods (cf. [114][115][116][117]), and may be further decomposed into equations in individual components of d f . Having introduced the basic setting, let us proceed with the formulation of balance equations in the individual subdomains.…”

Section: Mesh Updatementioning

confidence: 99%

Efficient split-step schemes for fluid-structure interaction involving incompressible generalised Newtonian flows

Schussnig,

Pacheco,

Fries

2021

Preprint

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Arterial blood flow, dam or ship construction and numerous other problems in biomedical and general engineering involve incompressible flows interacting with elastic structures. Such interactions heavily influence the deformation and stress states which, in turn, affect the design. Consequently, any reliable model of such physical processes must consider the coupling of fluids and solids. However, complexity increases for non-Newtonian fluids, such as blood or polymer melts. In these fluids, subtle differences in the local shear-rate can have a drastic impact on the flow. Existing numerical solution strategies devised for Newtonian fluids are either not applicable or ineffective in such scenarios. To address these shortcomings, we present here a higher-order accurate, added-mass-stable fluid-structure interaction scheme centered around a split-step fluid solver. We compare several implicit and semi-implicit variants of the algorithm and verify convergence in space and time. Numerical examples show good performance in both benchmarks and a realistic setting of blood flow through an abdominal aortic aneurysm.

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Section: Mesh Updatementioning

confidence: 99%

Efficient split-step schemes for fluid-structure interaction involving incompressible generalised Newtonian flows

Schussnig,

Pacheco,

Fries

2021

Preprint

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“…Selective treatment of individual mesh deformation elements have been applied before in various forms to linear and non-linear elasticity models [17,7,18,19]. In this work, we apply layered selective stiffening to the spring analogy model.…”

Section: Layered Selective Stiffening At the Fluid-structure Interfacementioning

confidence: 99%

“…A final remark about the continuous linear elasticity model is in order. Shamanskiy and Simeon [19] mentioned that a better result could be obtained from this model if it is used in iterations instead of in a single step.…”

Section: Layered Selective Stiffening At the Fluid-structure Interfacementioning

confidence: 99%

“…Takizawa et al [24] used fiber-reinforced hyperelasticity with optimized zero-stress states to develop a low-distortion mesh moving method. More recently, Shamanskiy and Simeon [19] introduced a mesh deformation technique based on a logarithmic variation of the neo-Hookean material model. A noteworthy remark from [19] is that the computational cost of deforming the fluid mesh could be greatly reduced by localizing the mesh deformation to the area surrounding the moving structure.…”

Section: Hyperelastic Modelmentioning

confidence: 99%

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On Mesh Deformation Techniques for Topology Optimization of Fluid-Structure Interaction Problems

Abdelhamid,

Czekanski

2021

Preprint

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Fluid-structure interactions are a widespread phenomenon in nature. Although their numerical modeling have come a long way, the application of numerical design tools to these multiphysics problems is still lagging behind. Gradient-based optimization is the most popular approach in topology optimization currently. Hence, it's a necessity to utilize mesh deformation techniques that have continuous, smooth derivatives. In this work, we discuss mesh deformation techniques for structured, quadrilateral meshes. We discuss and comment on two legacy mesh deformation techniques; namely the spring analogy model and the linear elasticity model. In addition, we propose a new technique based on the Yeoh hyperelasticity model. We focus on mesh quality as a gateway to mesh admissibility. We propose layered selective stiffening such that the elements adjacent to the fluid-structure interface -where the bulk of the mesh distortion occurs -are stiffened in consecutive layers. The legacy and the new models are able to sustain large deformations without deprecating the mesh quality, and the results are enhanced with using layered selective stiffening.

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“…Alexander Shamanskiy [14] compared several MMTSs based on solutions of elliptical partial differential equations, including harmonic extension, double harmonic extension, and techniques based on linear elastic equations. In addition, a special MMT was proposed, which uses the idea of a continuous method to solve nonlinear elastic equations effectively.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Simulation Study of Pressure Pulsations during Hose Pump Operation

Wang

Zhang

et al. 2021

Processes

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An adventitious flow field has a great impact on the operational reliability of pumps; therefore, it is important to study pump flow characteristics to reduce the noise, vibration, and cavitation performance of pumps. To study the pressure fluctuation characteristics of the hose pump, a three-dimensional two-way fluid structure coupling model of the hose pump was established. The transient structural module, fluid flow (fluent) module, and system coupling module of ANSYS Workbench 19.0 were used to simulate the unsteady multiple working conditions of the hose pump. The accuracy and reliability of the calculation results from the fluid solid coupling simulation were verified via experimentation. The results show that the roller pass frequency is the main frequency of the pressure fluctuation at the outlet of the hose pump. When the plane of the deformation recovery area is small, the pressure pulsation amplitude is large, and the outlet pressure and speed are large. Due to the irregular backflow of the fluid, stall zones of different sizes form, the outlet pressure is closer to a sinusoid when there is no pressure. The higher the rotating speed is, the faster the pressure roller leaving the hose, the higher the pressure pulsation, and the larger the stall zone. Therefore, the best way to reduce the pressure pulsation in the pump is to optimize the geometry of the pressure roller and change the outlet angle of the hose.

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Mesh moving techniques in fluid-structure interaction: robustness, accumulated distortion and computational efficiency

Cited by 36 publications

References 34 publications

Efficient split-step schemes for fluid-structure interaction involving incompressible generalised Newtonian flows

Efficient split-step schemes for fluid-structure interaction involving incompressible generalised Newtonian flows

On Mesh Deformation Techniques for Topology Optimization of Fluid-Structure Interaction Problems

Experimental and Numerical Simulation Study of Pressure Pulsations during Hose Pump Operation

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