scholarly journals Advanced Radial Basis Functions Mesh Morphing for High Fidelity Fluid-Structure Interaction with Known Movement of the Walls: Simulation of an Aortic Valve

2020 ◽  
pp. 280-293
Author(s):  
Leonardo Geronzi ◽  
Emanuele Gasparotti ◽  
Katia Capellini ◽  
Ubaldo Cella ◽  
Corrado Groth ◽  
...  
Keyword(s):  
Aortic Valve ◽  
Radial Basis Functions ◽  
Fluid Structure Interaction ◽  
Basis Functions ◽  
High Fidelity ◽  
Fluid Structure ◽  
Mesh Morphing ◽  
Structure Interaction ◽  
Radial Basis

scholarly journals Radial Basis Functions Vector Fields Interpolation for Complex Fluid Structure Interaction Problems

Fluids ◽  
2021 ◽  
Vol 6 (9) ◽  
pp. 314
Author(s):  
Corrado Groth ◽  
Stefano Porziani ◽  
Marco Evangelos Biancolini
Keyword(s):  
Radial Basis Functions ◽  
Vector Fields ◽  
Fluid Structure Interaction ◽  
Time History ◽  
Linear Displacement ◽  
Basis Functions ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Non Linear ◽  
Radial Basis

Fluid structure interaction (FSI) is a complex phenomenon that in several applications cannot be neglected. Given its complexity and multi-disciplinarity the solution of FSI problems is difficult and time consuming, requiring not only the solution of the structural and fluid domains, but also the use of expensive numerical methods to couple the two physics and to properly update the numerical grid. Advanced mesh morphing can be used to embed into the fluid grid the vector fields resulting from structural calculations. The main advantage is that such embedding and the related computational costs occur only at initialization of the computation. A proper combination of embedded vector fields can be used to tackle steady and transient FSI problems by structural modes superposition, for the case of linear structures, or to impose a full non-linear displacement time history. Radial basis functions interpolation, a powerful and precise meshless tool, is used in this work to combine the vector fields and propagate their effect to the full fluid domain of interest. A review of industrial high fidelity FSI problems tackled by means of the proposed method and RBF is given for steady, transient, and non-linear transient FSI problems.

Fast high fidelity CFD/CSM fluid structure interaction using RBF mesh morphing and modal superposition method

2019 ◽  
Vol 91 (6) ◽  
pp. 893-904 ◽  
Author(s):  
Corrado Groth ◽  
Ubaldo Cella ◽  
Emiliano Costa ◽  
Marco Evangelos Biancolini
Keyword(s):  
Fluid Structure Interaction ◽  
Superposition Method ◽  
High Fidelity ◽  
Modal Shape ◽  
Fluid Structure ◽  
Content Type ◽  
Mesh Morphing ◽  
Structure Interaction ◽  
Engineering Models ◽  
Computational Structural Mechanics

Purpose This paper aims to present a fast and effective approach to tackle complex fluid structure interaction problems that are relevant for the aeronautical design. Design/methodology/approach High fidelity computer-aided engineering models (computational fluid dynamics [CFD] and computational structural mechanics) are coupled by embedding modal shapes into the CFD solver using RBF mesh morphing. Findings The theoretical framework is first explained and its use is then demonstrated with a review of applications including both steady and unsteady cases. Different flow and structural solvers are considered to showcase the portability of the concept. Practical implications The method is flexible and can be used for the simulation of complex scenarios, including components vibrations induced by external devices, as in the case of flapping wings. Originality/value The computation mesh of the CFD model becomes parametric with respect to the modal shape and, so, capable to self-adapt to the loads exerted by the surrounding fluid both for steady and transient numerical studies.

Modeling of aortic valve stenosis using fluid-structure interaction method

Perfusion ◽  
2021 ◽  
pp. 026765912199854
Author(s):  
Mohammad Javad Ghasemi Pour ◽  
Kamran Hassani ◽  
Morteza Khayat ◽  
Shahram Etemadi Haghighi
Keyword(s):  
Blood Flow ◽  
Aortic Valve ◽  
Fluid Structure Interaction ◽  
Three Dimensional ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Relaxation Phase ◽  
Exercise Condition ◽  
Time Dependent Domain ◽  
Comparison Of The Results

Background and objectives: Fluid structure interaction (FSI) is defined as interaction of the structures with contacting fluids. The aortic valve experiences the interaction with blood flow in systolic phase. In this study, we have tried to predict the hemodynamics of blood flow through a normal and stenotic aortic valve in two relaxation and exercise conditions using a three-dimensional FSI method. Methods: The aorta valve was modeled as a three-dimensional geometry including a normal model and two others with 25% and 50% stenosis. The geometry of the aortic valve was extracted from CT images and the models were generated by MMIMCS software and then they were implemented in ANSYS software. The pulsatile flow rate was used for all cases and the numerical simulations were conducted based on a time-dependent domain. Results: The obtained results including the velocity, pressure, and shear stress contours in different systolic time sequences were explained and discussed. The maximum blood flow velocity in relaxation phase was obtained 1.62 m/s (normal valve), 3.78 m/s (25% stenosed valve), and 4.73 m/s (50% stenosed valve). In exercise condition, the maximum velocities are 2.86, 4.32, and 5.42 m/s respectively. The maximum blood pressure in relaxation phase was calculated 111.45 mmHg (normal), 148.66 mmHg (25% stenosed), and 164.21 mmHg (50% stenosed). However, the calculated values in exercise situation were 129.57, 163.58, and 191.26 mmHg. The validation of the predicted results was also conducted using existing literature. Conclusions: We believe that such model are useful tools for biomechanical experts. The further studies should be done using experimental data and the data are implemented on the boundary conditions for better comparison of the results.

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