Numerical method for simulation of unsteady flows with immersed moving/deforming elastic structures on unstructured grids

This work aims to apply Computational Fluid Dynamics (CFD) and Computational Structural Dynamics (CSD) to simulate the interactions between unsteady compressible flow and immersed moving and/or deforming solid structures. The main challenge is due to the fact that fluid dynamics, structural dynamics...

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Main Author: Lv Xin
Other Authors: Huang Xiaoyang
Format: Theses and Dissertations
Language:English
Published: 2010
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Online Access:https://hdl.handle.net/10356/41529
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-415292023-03-11T17:26:02Z Numerical method for simulation of unsteady flows with immersed moving/deforming elastic structures on unstructured grids Lv Xin Huang Xiaoyang Zhao Yong School of Mechanical and Aerospace Engineering DRNTU::Engineering::Mechanical engineering This work aims to apply Computational Fluid Dynamics (CFD) and Computational Structural Dynamics (CSD) to simulate the interactions between unsteady compressible flow and immersed moving and/or deforming solid structures. The main challenge is due to the fact that fluid dynamics, structural dynamics and their interactions are highly nonlinear, multiscale and multiphysical phenomena. In this work, an efficient and accurate numerical simulation package, incorporating solution methods for both three dimensional Navier-Stokes (NS) and structural dynamic equations, has been successfully developed and validated. The baseline method is a finite-volume scheme using unstructured grids. Such features ensure the convenient and accurate modeling of complex geometries. A 3rd-order high-resolution edge-based Roe approximate scheme is adopted in the NS solver to accurately capture the possible existence of shock in highspeed flow regions, while cell-based 2nd-order Galerkin-type formulation is used to calculate the variable gradients. For temporal integration, a novel matrix-free implicit dual time-stepping is adopted. To simulate turbulent flows, a novel mixed dynamic formulation of eddy-viscosity subgrid model based on Smagorinsky-Lilly method has been integrated into the Large-eddy simulation module of the package. To couple the NS and structural dynamics solvers more efficiently, the immersed membrane method (IMM) is adopted and enhanced to handle the fluid-structure interaction. DOCTOR OF PHILOSOPHY (MAE) 2010-07-16T07:56:05Z 2010-07-16T07:56:05Z 2008 2008 Thesis Lv X. (2008). Numerical method for simulation of unsteady flows with immersed moving/deforming elastic structures on unstructured grids. Doctoral thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/41529 10.32657/10356/41529 en 352 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Mechanical engineering
spellingShingle DRNTU::Engineering::Mechanical engineering
Lv Xin
Numerical method for simulation of unsteady flows with immersed moving/deforming elastic structures on unstructured grids
description This work aims to apply Computational Fluid Dynamics (CFD) and Computational Structural Dynamics (CSD) to simulate the interactions between unsteady compressible flow and immersed moving and/or deforming solid structures. The main challenge is due to the fact that fluid dynamics, structural dynamics and their interactions are highly nonlinear, multiscale and multiphysical phenomena. In this work, an efficient and accurate numerical simulation package, incorporating solution methods for both three dimensional Navier-Stokes (NS) and structural dynamic equations, has been successfully developed and validated. The baseline method is a finite-volume scheme using unstructured grids. Such features ensure the convenient and accurate modeling of complex geometries. A 3rd-order high-resolution edge-based Roe approximate scheme is adopted in the NS solver to accurately capture the possible existence of shock in highspeed flow regions, while cell-based 2nd-order Galerkin-type formulation is used to calculate the variable gradients. For temporal integration, a novel matrix-free implicit dual time-stepping is adopted. To simulate turbulent flows, a novel mixed dynamic formulation of eddy-viscosity subgrid model based on Smagorinsky-Lilly method has been integrated into the Large-eddy simulation module of the package. To couple the NS and structural dynamics solvers more efficiently, the immersed membrane method (IMM) is adopted and enhanced to handle the fluid-structure interaction.
author2 Huang Xiaoyang
author_facet Huang Xiaoyang
Lv Xin
format Theses and Dissertations
author Lv Xin
author_sort Lv Xin
title Numerical method for simulation of unsteady flows with immersed moving/deforming elastic structures on unstructured grids
title_short Numerical method for simulation of unsteady flows with immersed moving/deforming elastic structures on unstructured grids
title_full Numerical method for simulation of unsteady flows with immersed moving/deforming elastic structures on unstructured grids
title_fullStr Numerical method for simulation of unsteady flows with immersed moving/deforming elastic structures on unstructured grids
title_full_unstemmed Numerical method for simulation of unsteady flows with immersed moving/deforming elastic structures on unstructured grids
title_sort numerical method for simulation of unsteady flows with immersed moving/deforming elastic structures on unstructured grids
publishDate 2010
url https://hdl.handle.net/10356/41529
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