Solving fluid-structure interaction problems using the FlowVision and CAE Fidesys software packages

A. A. Aksenov ; S. V. Zhluktov ; E. E. Son ; A. A. Tokar' ; V. S. Karpenko

Čebyševskij sbornik, Tome 18 (2017) no. 3, pp. 28-43.

Résumé

The paper considers the numerical method of solving problems of strong interaction between a liquid (gas) and a deformed body: the fluid exerts a force on the body, the body changes its shape, the altered shape of the body changes the flow. The developed method is demonstrated on the test problem of air flow around the valve. The problem is solved in a three-dimensional formulation. The deformable body flows around an unlimited airflow at right angles. The authors consider the body deformation dependence in the presence of a defect (hole) in it located in different positions. The air flow is calculated in the FlowVision software package. FlowVision uses the finite volume method for approximation of the fluid motion equations. It implements an explicit and implicit methods of integrating these equations. FlowVision can solve interdisciplinary problems: simulate multiphase flows using the VOF method, set the motion of bodies (movement of impermeable boundaries) along a fixed computational grid, simulate flows in rotating machines using the sliding grid method, solve fluid-body interaction problems using two-way coupling between FlowVision and FEM software. The body deformation is calculated in the CAE Fidesys software package. CAE Fidesys allows to conduct various types of full-cycle strength engineering analysis from the construction of a mesh to the visualization of calculation results. For the numerical solution of solid mechanics problems CAE Fidesys uses the finite element method and the spectral elements method. CAE Fidesys allows to solve both linear and non-linear, static and dynamic strength problems. For joint calculation, a two-way coupling technology was developed that performs two-way communication between the CAE Fidesys and FlowVision systems. With the use of this technology, a numerical investigation of the problem of flow past a valve carried out. The behavior of the valve is compared with various variations in the location of the elliptical hole in it. The results lead to the conclusion that the associated FlowVision-CAE Fidesys software package calculates valve characteristics on meshes of moderate dimension with reasonable accuracy.

Détail

Keywords: strong fluid-structure interaction (FSI), finite volume method, finite element method, Navier-Stokes equations, valve in the channel, strength analysis, stress-strain state.

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