Dokument-ID Dokumenttyp Verfasser/Autoren Herausgeber Haupttitel Abstract Auflage Verlagsort Verlag Erscheinungsjahr Seitenzahl Schriftenreihe Titel Schriftenreihe Bandzahl ISBN Quelle der Hochschulschrift Konferenzname Quelle:Titel Quelle:Jahrgang Quelle:Heftnummer Quelle:Erste Seite Quelle:Letzte Seite URN DOI Abteilungen OPUS4-3172 Wissenschaftlicher Artikel Zhuang, Xiaoying; Huang, Runqiu; Liang, Chao; Rabczuk, Timon A coupled thermo-hydro-mechanical model of jointed hard rock for compressed air energy storage Renewable energy resources such as wind and solar are intermittent, which causes instability when being connected to utility grid of electricity. Compressed air energy storage (CAES) provides an economic and technical viable solution to this problem by utilizing subsurface rock cavern to store the electricity generated by renewable energy in the form of compressed air. Though CAES has been used for over three decades, it is only restricted to salt rock or aquifers for air tightness reason. In this paper, the technical feasibility of utilizing hard rock for CAES is investigated by using a coupled thermo-hydro-mechanical (THM) modelling of nonisothermal gas flow. Governing equations are derived from the rules of energy balance, mass balance, and static equilibrium. Cyclic volumetric mass source and heat source models are applied to simulate the gas injection and production. Evaluation is carried out for intact rock and rock with discrete crack, respectively. In both cases, the heat and pressure losses using air mass control and supplementary air injection are compared. Mathematical Problems in Engineering urn:nbn:de:gbv:wim2-20170428-31726 10.1155/2014/179169 Institut für Strukturmechanik (ISM) OPUS4-3348 Wissenschaftlicher Artikel Zhuang, Xiaoying; Huang, Runqiu; Rabczuk, Timon; Liang, C. A coupled thermo-hydro-mechanical model of jointed hard rock for compressed air energy storage A coupled thermo-hydro-mechanical model of jointed hard rock for compressed air energy storage Mathematical Problems in Engineering Institut für Strukturmechanik (ISM) OPUS4-3167 Wissenschaftlicher Artikel Vu-Bac, N.; Nguyen-Xuan, Hung; Chen, Lei; Lee, C.K.; Zi, Goangseup; Zhuang, Xiaoying; Liu, G.R.; Rabczuk, Timon A phantom-node method with edge-based strain smoothing for linear elastic fracture mechanics This paper presents a novel numerical procedure based on the combination of an edge-based smoothed finite element (ES-FEM) with a phantom-node method for 2D linear elastic fracture mechanics. In the standard phantom-node method, the cracks are formulated by adding phantom nodes, and the cracked element is replaced by two new superimposed elements. This approach is quite simple to implement into existing explicit finite element programs. The shape functions associated with discontinuous elements are similar to those of the standard finite elements, which leads to certain simplification with implementing in the existing codes. The phantom-node method allows modeling discontinuities at an arbitrary location in the mesh. The ES-FEM model owns a close-to-exact stiffness that is much softer than lower-order finite element methods (FEM). Taking advantage of both the ES-FEM and the phantom-node method, we introduce an edge-based strain smoothing technique for the phantom-node method. Numerical results show that the proposed method achieves high accuracy compared with the extended finite element method (XFEM) and other reference solutions. Journal of Applied Mathematics urn:nbn:de:gbv:wim2-20170426-31676 10.1155/2013/978026 Institut für Strukturmechanik (ISM) OPUS4-3578 Wissenschaftlicher Artikel Vu-Bac, N.; Lahmer, Tom; Zhuang, Xiaoying; Nguyen-Thoi, T.; Rabczuk, Timon A software framework for probabilistic sensitivity analysis for computationally expensive models A software framework for probabilistic sensitivity analysis for computationally expensive models 12 Advances in Engineering Software 19 31 Institut für Strukturmechanik (ISM) OPUS4-3291 Wissenschaftlicher Artikel Vu-Bac, N.; Silani, Mohammad; Lahmer, Tom; Zhuang, Xiaoying; Rabczuk, Timon A unified framework for stochastic predictions of Young's modulus of clay/epoxy nanocomposites (PCNs) A unified framework for stochastic predictions of Young's modulus of clay/epoxy nanocomposites (PCNs) 15 Computational Materials Science 520 535 Institut für Strukturmechanik (ISM) OPUS4-3337 Wissenschaftlicher Artikel Nguyen-Thanh, Nhon; Muthu, Jacob; Zhuang, Xiaoying; Rabczuk, Timon An adaptive three-dimensional RHT-splines formulation in linear elasto-statics and elasto-dynamics An adaptive three-dimensional RHT-splines formulation in linear elasto-statics and elasto-dynamics 16 Computational Mechanics 369 385 Institut für Strukturmechanik (ISM) OPUS4-3296 Wissenschaftlicher Artikel Nguyen-Thanh, Nhon; Valizadeh, Navid; Nguyen, Manh Hung; Nguyen-Xuan, Hung; Zhuang, Xiaoying; Areias, Pedro; Zi, Goangseup; Bazilevs, Yuri; De Lorenzis, Laura; Rabczuk, Timon An extended isogeometric thin shell analysis based on Kirchhoff-Love theory An extended isogeometric thin shell analysis based on Kirchho_-Love theory 26 Computer Methods in Applied Mechanics and Engineering 265 291 Institut für Strukturmechanik (ISM) OPUS4-4676 Wissenschaftlicher Artikel Guo, Hongwei; Zhuang, Xiaoying; Chen, Pengwan; Alajlan, Naif; Rabczuk, Timon Analysis of three-dimensional potential problems in non-homogeneous media with physics-informed deep collocation method using material transfer learning and sensitivity analysis In this work, we present a deep collocation method (DCM) for three-dimensional potential problems in non-homogeneous media. This approach utilizes a physics-informed neural network with material transfer learning reducing the solution of the non-homogeneous partial differential equations to an optimization problem. We tested different configurations of the physics-informed neural network including smooth activation functions, sampling methods for collocation points generation and combined optimizers. A material transfer learning technique is utilized for non-homogeneous media with different material gradations and parameters, which enhance the generality and robustness of the proposed method. In order to identify the most influential parameters of the network configuration, we carried out a global sensitivity analysis. Finally, we provide a convergence proof of our DCM. The approach is validated through several benchmark problems, also testing different material variations. 22 Engineering with Computers 2022 1 22 urn:nbn:de:gbv:wim2-20220811-46764 10.1007/s00366-022-01633-6 Institut für Strukturmechanik (ISM) OPUS4-3574 Wissenschaftlicher Artikel Nanthakumar, S.S.; Lahmer, Tom; Zhuang, Xiaoying; Zi, Goangseup; Rabczuk, Timon Detection of material interfaces using a regularized level set method in piezoelectric structures Detection of material interfaces using a regularized level set method in piezoelectric structures 23 Inverse Problems in Science and Engineering 153 176 Institut für Strukturmechanik (ISM) OPUS4-3277 Wissenschaftlicher Artikel Nanthakumar, S.S.; Lahmer, Tom; Zhuang, Xiaoying; Zi, Goangseup; Rabczuk, Timon Detection of material interfaces using a regularized level set method in piezoelectric structures Detection of material interfaces using a regularized level set method in piezoelectric structures Inverse Problems in Science and Engineering Institut für Strukturmechanik (ISM)