Analysis of fluid -structure interaction using meshless particle and finite element methods: Biomechanics applications
Computational numerical analysis has been an indispensable procedure for scientific and industrial research during the last half century. It reduces significantly time and cost by replacing many expensive and elaborate experiments with virtual simulations. It has broad potential as a predictable num...
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01.01.2006
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| Abstract | Computational numerical analysis has been an indispensable procedure for scientific and industrial research during the last half century. It reduces significantly time and cost by replacing many expensive and elaborate experiments with virtual simulations. It has broad potential as a predictable numerical model. In the bioengineering area, there are many technical difficulties in dealing with the living organism in vivo. Furthermore, if research is performed on humans, it is not only associated with technical problems but also provokes ethical and moral issues. Most existing computational human body models were developed using the finite element method (FEM). Although FEM has made great progress in the structure analysis area, there are certain problems that are difficult for FEM. One of these difficulties is the fluid and structure interaction (FSI) analysis. In this thesis, an improved FSI analysis method is proposed for computational human body modeling. It is based on the Meshless Particle Method (MPM) to solve the fluid domain problem and the FEM to solve the solid domain problem. Among several kinds of existing meshfree methods, the Smoothed Particle Hydrodynamics (SPH) method and Moving Particle Semi-implicit (MPS) method are used. For the computation of pressure values in the fluid domain, two models are tested. One is the pseudo-incompressible model, and the other is the pressure Poisson equation (PPE) model. The SPH method will involve a pseudo-incompressible model, while the MPS will involve a PPE model. To combine the fluid and solid domains simultaneously, a contact algorithm is chosen in a shared boundary area. For the coupling, a modified particle boundary model is proposed. This boundary model is also appropriate to realize the no-slip condition and shear force model between fluid and solid boundaries. An FSI solver was developed, tested in several examples, and validated by comparison with the results of commercial software. It was also applied to several simplified 2D problems representing human internal organs under external impact loading. These examples demonstrate the potential of this new approach for the simulation of complex biomechanical system. |
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| AbstractList | Computational numerical analysis has been an indispensable procedure for scientific and industrial research during the last half century. It reduces significantly time and cost by replacing many expensive and elaborate experiments with virtual simulations. It has broad potential as a predictable numerical model. In the bioengineering area, there are many technical difficulties in dealing with the living organism in vivo. Furthermore, if research is performed on humans, it is not only associated with technical problems but also provokes ethical and moral issues. Most existing computational human body models were developed using the finite element method (FEM). Although FEM has made great progress in the structure analysis area, there are certain problems that are difficult for FEM. One of these difficulties is the fluid and structure interaction (FSI) analysis. In this thesis, an improved FSI analysis method is proposed for computational human body modeling. It is based on the Meshless Particle Method (MPM) to solve the fluid domain problem and the FEM to solve the solid domain problem. Among several kinds of existing meshfree methods, the Smoothed Particle Hydrodynamics (SPH) method and Moving Particle Semi-implicit (MPS) method are used. For the computation of pressure values in the fluid domain, two models are tested. One is the pseudo-incompressible model, and the other is the pressure Poisson equation (PPE) model. The SPH method will involve a pseudo-incompressible model, while the MPS will involve a PPE model. To combine the fluid and solid domains simultaneously, a contact algorithm is chosen in a shared boundary area. For the coupling, a modified particle boundary model is proposed. This boundary model is also appropriate to realize the no-slip condition and shear force model between fluid and solid boundaries. An FSI solver was developed, tested in several examples, and validated by comparison with the results of commercial software. It was also applied to several simplified 2D problems representing human internal organs under external impact loading. These examples demonstrate the potential of this new approach for the simulation of complex biomechanical system. |
| Author | Lee, Ikjoong |
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| Title | Analysis of fluid -structure interaction using meshless particle and finite element methods: Biomechanics applications |
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