In this work,we employ fluid-structure interaction(FSI)systems with immersed flexible structures with or without free surfaces to explore both Singular Value Decomposition(SVD)-based model reduction methods and mode s...In this work,we employ fluid-structure interaction(FSI)systems with immersed flexible structures with or without free surfaces to explore both Singular Value Decomposition(SVD)-based model reduction methods and mode superposition methods.For acoustoelastic FSI systems,we adopt a three-field mixed finite element formulation with displacement,pressure,and vorticity moment unknowns to effectively enforce the irrotationality constraint.We also propose in this paper a new Inf-Sup test based on the lowest non-zero singular value of the coupling matrix for the selection of reliable sets of finite element discretizations for displacement and pressure as well as vorticity moment.Our numerical examples demonstrate that mixed finite element formulations can be effectively used to predict resonance frequencies of fully coupled FSI systems within different ranges of respective physical motions,namely,acoustic,structural,and slosh motions,without the contamination of spurious(non-physical)modes with nonzero frequencies.Our numerical results also confirm that SVD-based model reduction methods can be effectively used to reconstruct from a few snapshots of transient solutions the dominant principal components with moderate level of signal to noise ratio,which may eventually open doors for simulation of long-term behaviors of both linear and nonlinear FSI systems.展开更多
In recent years,there has been a major surge of interest in the development of simulation techniques and strategies for fluid-structure interaction(FSI)problems,mainly driven by a large spectrum of applications in phy...In recent years,there has been a major surge of interest in the development of simulation techniques and strategies for fluid-structure interaction(FSI)problems,mainly driven by a large spectrum of applications in physiology,medical sciences,material sciences,manufacturing processes,and many other engineering disciplines.展开更多
In the oil industry, techniques decreasing unwanted water production have drawn large amounts of interest from many companies. During water injection operations, water is injected into the oil reservoir to extract oil...In the oil industry, techniques decreasing unwanted water production have drawn large amounts of interest from many companies. During water injection operations, water is injected into the oil reservoir to extract oil trapped in the formation. Due to the heterogeneity in the reservoir formation, oil production will decline and water production will increase as the injected water sweeps the high permeability zones. In order to flush out the oil remaining in the low permeability zones, many treatments have been used. One such treatment involves the injection of an SAP （superabsorbent polymer） into the high permeability zones. The swelled polymer will decrease the heterogeneity of reservoir permeability, thus forcing water injection into the oil rich, unswept zones/areas of the formation. Proper application of an SAP can have a dramatic impact on both the production and lifespan of mature oil wells. Successful treatment is reliant upon the reservoir salinity, temperature, and pH.展开更多
文摘In this work,we employ fluid-structure interaction(FSI)systems with immersed flexible structures with or without free surfaces to explore both Singular Value Decomposition(SVD)-based model reduction methods and mode superposition methods.For acoustoelastic FSI systems,we adopt a three-field mixed finite element formulation with displacement,pressure,and vorticity moment unknowns to effectively enforce the irrotationality constraint.We also propose in this paper a new Inf-Sup test based on the lowest non-zero singular value of the coupling matrix for the selection of reliable sets of finite element discretizations for displacement and pressure as well as vorticity moment.Our numerical examples demonstrate that mixed finite element formulations can be effectively used to predict resonance frequencies of fully coupled FSI systems within different ranges of respective physical motions,namely,acoustic,structural,and slosh motions,without the contamination of spurious(non-physical)modes with nonzero frequencies.Our numerical results also confirm that SVD-based model reduction methods can be effectively used to reconstruct from a few snapshots of transient solutions the dominant principal components with moderate level of signal to noise ratio,which may eventually open doors for simulation of long-term behaviors of both linear and nonlinear FSI systems.
文摘In recent years,there has been a major surge of interest in the development of simulation techniques and strategies for fluid-structure interaction(FSI)problems,mainly driven by a large spectrum of applications in physiology,medical sciences,material sciences,manufacturing processes,and many other engineering disciplines.
文摘In the oil industry, techniques decreasing unwanted water production have drawn large amounts of interest from many companies. During water injection operations, water is injected into the oil reservoir to extract oil trapped in the formation. Due to the heterogeneity in the reservoir formation, oil production will decline and water production will increase as the injected water sweeps the high permeability zones. In order to flush out the oil remaining in the low permeability zones, many treatments have been used. One such treatment involves the injection of an SAP （superabsorbent polymer） into the high permeability zones. The swelled polymer will decrease the heterogeneity of reservoir permeability, thus forcing water injection into the oil rich, unswept zones/areas of the formation. Proper application of an SAP can have a dramatic impact on both the production and lifespan of mature oil wells. Successful treatment is reliant upon the reservoir salinity, temperature, and pH.
