Abstract A novel mesh-free approach has been developed to solve the conduction heat transfer equa... more Abstract A novel mesh-free approach has been developed to solve the conduction heat transfer equations in a particulate bed domain of ferromagnetic powder with and without magnetic field effect. The proposed method is based on a probabilistic approach to defining various configurations of energy transfer paths around an arbitrary particle called “local packed element”, and results are compared with experimental data. Furthermore, a Monte-Carlo approach is used to calculate the magnetic field of a permanent magnet with an arbitrary shape on any arbitrary point around it, and the outcome is also compared against measurements. In both cases, the proposed mesh-free method shows excellent agreement with available empirical results. The proposed method is then used to model the effect of an external magnetic field in the conductive heat transfer in a particulate bed of ferromagnetic powder. It is concluded that the presence of a magnetic field increases thermal diffusion in ferromagnetic powder bed domains by increasing thermal conductivity.
IEEE Transactions on Applied Superconductivity, 2017
Performing quench propagation simulations of full size superconducting coils is a challenging pro... more Performing quench propagation simulations of full size superconducting coils is a challenging problem due to complex coil structures and internal arrangements of superconducting wires. In addition, superconducting wires and cables themselves constitute complex 3D arrangements comprised of superconductor, matrix, stabilizer, insulation and other materials. Modelling quenches in complete coils is therefore a complex multi-scale and multi-physics problem that is difficult to solve with conventional techniques like finite element or finite difference methods. Monte-Carlo methods have been successfully used to simulate various multi-scale and multi-physics problems, but to our knowledge have not been applied to quench propagation simulations. In the presented work the application of the Monte-Carlo method for quench propagation problems has been studied and first results are presented. A mesh free Monte-Carlo method has been used that lends itself easily to parallelization.
A novel numerical method is proposed for the solution of transient multi-physics problems involvi... more A novel numerical method is proposed for the solution of transient multi-physics problems involving heat conduction, electrical current sharing and Joule heating. The innovation consists of a mesh-free Monte Carlo approach that eliminates or drastically reduces the particle scattering requirements typical of conventional Monte-Carlo methods. The proposed algorithm encapsulates a volume around each point that affects the solution at a given point in the domain; the volume includes other points that represent small perturbations along the path of energy transfer. The proposed method is highly parallelizable and amenable for GPU computing, and its computational performance was substantially increased by the elimination of scattered interpolation. The accuracy and simulation time of the proposed method are compared against a finite element solution and also against experimental results from existing literature. The proposed method provides accuracy comparable to that of finite element methods, achieving an order of magnitude reduction in simulation time.
International Journal of Heat and Mass Transfer, 2018
A new solution for the three-dimensional transient heat conduction from a homogeneous medium to a... more A new solution for the three-dimensional transient heat conduction from a homogeneous medium to a non-homogeneous multi-layered composite material with temperature dependent thermal properties using a mesh-free Monte-Carlo method is proposed. The novel contributions include a new algorithm to account for the impact of thermal diffusivities from source to sink in the calculation of the particles' step length (particles are represented as bundles of energy emitted from each source), and a derivation of the three-dimensional peripheral integration to account for the influence of material properties around the sink on its temperature. Simulations developed using the proposed method are compared against both experimental measurements and results from a finite element simulation.
International Journal of Heat and Mass Transfer, 2017
A novel mesh-free Monte-Carlo method for two-dimensional transient heat conduction in composite m... more A novel mesh-free Monte-Carlo method for two-dimensional transient heat conduction in composite media with temperature dependent thermal properties is presented. The proposed approach is based on expressing the solution of the transient conductive heat transfer equation, in domains with temperature-dependent material properties, as a combination of two solutions: Bessel functions and integrals of peripheral temperature. The proposed approach is used to solve transient conduction in composite layered materials with temperature dependent thermal diffusivity. Results are compared against others obtained using a conventional finite element approach. Experimental results for heat transfer in a nonhomogeneous domain (composite layered material) are presented to demonstrate the performance of the proposed approach.
Background: Familial Hypercholesterolemia (FH) is a genetic disorder in lipoprotein metabolism ca... more Background: Familial Hypercholesterolemia (FH) is a genetic disorder in lipoprotein metabolism caused by mutations that increase LDL and total cholesterol levels. High LDL and cholesterol levels increase atherosclerosis risk. FH mutations impact the LDL receptor (LDLR) gene, apolipoprotein B, and PCSK9. About 20% of FH cases have a polygenic basis that affects LDL levels. We decided to conduct a systematic review of the available research in this field to provide a thorough genes/proteins network meta-analysis on the impact of drug combinations on the management of heterozygous Familial Hypercholesterolemia (HeFH). This paper reviews and analyzes the literature on the effects of medication combinations on HeFH management. This study investigates articles that analyzed the management and adjuvants of HeFH to recommend forceful drug combinations. Methods: This systematic review and network meta-analysis analyzed the Science Direct, Embase, Scopus, PubMed, Web of Science (ISI), and Goo...
Using a three-dimensional layerwise-finite element method, the free vibration of thick laminated ... more Using a three-dimensional layerwise-finite element method, the free vibration of thick laminated circular and annular plates supported on the elastic foundation is studied. The Pasternak-type formulation is employed to model the interaction between the plate and the elastic foundation. The discretized governing equations are derived using the Hamilton's principle in conjunction with the layerwise theory in the thickness direction, the finite element (FE) in the radial direction and trigonometric function in the circumferential direction, respectively. The fast rate of convergence of the method is demonstrated and to verify its accuracy, comparison studies with the available solutions in the literature are performed. The effects of the geometrical parameters, the material properties and the elastic foundation parameters on the natural frequency parameters of the laminated thick circular and annular plates subjected to various boundary conditions are presented.
Abstract A novel mesh-free approach has been developed to solve the conduction heat transfer equa... more Abstract A novel mesh-free approach has been developed to solve the conduction heat transfer equations in a particulate bed domain of ferromagnetic powder with and without magnetic field effect. The proposed method is based on a probabilistic approach to defining various configurations of energy transfer paths around an arbitrary particle called “local packed element”, and results are compared with experimental data. Furthermore, a Monte-Carlo approach is used to calculate the magnetic field of a permanent magnet with an arbitrary shape on any arbitrary point around it, and the outcome is also compared against measurements. In both cases, the proposed mesh-free method shows excellent agreement with available empirical results. The proposed method is then used to model the effect of an external magnetic field in the conductive heat transfer in a particulate bed of ferromagnetic powder. It is concluded that the presence of a magnetic field increases thermal diffusion in ferromagnetic powder bed domains by increasing thermal conductivity.
IEEE Transactions on Applied Superconductivity, 2017
Performing quench propagation simulations of full size superconducting coils is a challenging pro... more Performing quench propagation simulations of full size superconducting coils is a challenging problem due to complex coil structures and internal arrangements of superconducting wires. In addition, superconducting wires and cables themselves constitute complex 3D arrangements comprised of superconductor, matrix, stabilizer, insulation and other materials. Modelling quenches in complete coils is therefore a complex multi-scale and multi-physics problem that is difficult to solve with conventional techniques like finite element or finite difference methods. Monte-Carlo methods have been successfully used to simulate various multi-scale and multi-physics problems, but to our knowledge have not been applied to quench propagation simulations. In the presented work the application of the Monte-Carlo method for quench propagation problems has been studied and first results are presented. A mesh free Monte-Carlo method has been used that lends itself easily to parallelization.
A novel numerical method is proposed for the solution of transient multi-physics problems involvi... more A novel numerical method is proposed for the solution of transient multi-physics problems involving heat conduction, electrical current sharing and Joule heating. The innovation consists of a mesh-free Monte Carlo approach that eliminates or drastically reduces the particle scattering requirements typical of conventional Monte-Carlo methods. The proposed algorithm encapsulates a volume around each point that affects the solution at a given point in the domain; the volume includes other points that represent small perturbations along the path of energy transfer. The proposed method is highly parallelizable and amenable for GPU computing, and its computational performance was substantially increased by the elimination of scattered interpolation. The accuracy and simulation time of the proposed method are compared against a finite element solution and also against experimental results from existing literature. The proposed method provides accuracy comparable to that of finite element methods, achieving an order of magnitude reduction in simulation time.
International Journal of Heat and Mass Transfer, 2018
A new solution for the three-dimensional transient heat conduction from a homogeneous medium to a... more A new solution for the three-dimensional transient heat conduction from a homogeneous medium to a non-homogeneous multi-layered composite material with temperature dependent thermal properties using a mesh-free Monte-Carlo method is proposed. The novel contributions include a new algorithm to account for the impact of thermal diffusivities from source to sink in the calculation of the particles' step length (particles are represented as bundles of energy emitted from each source), and a derivation of the three-dimensional peripheral integration to account for the influence of material properties around the sink on its temperature. Simulations developed using the proposed method are compared against both experimental measurements and results from a finite element simulation.
International Journal of Heat and Mass Transfer, 2017
A novel mesh-free Monte-Carlo method for two-dimensional transient heat conduction in composite m... more A novel mesh-free Monte-Carlo method for two-dimensional transient heat conduction in composite media with temperature dependent thermal properties is presented. The proposed approach is based on expressing the solution of the transient conductive heat transfer equation, in domains with temperature-dependent material properties, as a combination of two solutions: Bessel functions and integrals of peripheral temperature. The proposed approach is used to solve transient conduction in composite layered materials with temperature dependent thermal diffusivity. Results are compared against others obtained using a conventional finite element approach. Experimental results for heat transfer in a nonhomogeneous domain (composite layered material) are presented to demonstrate the performance of the proposed approach.
Background: Familial Hypercholesterolemia (FH) is a genetic disorder in lipoprotein metabolism ca... more Background: Familial Hypercholesterolemia (FH) is a genetic disorder in lipoprotein metabolism caused by mutations that increase LDL and total cholesterol levels. High LDL and cholesterol levels increase atherosclerosis risk. FH mutations impact the LDL receptor (LDLR) gene, apolipoprotein B, and PCSK9. About 20% of FH cases have a polygenic basis that affects LDL levels. We decided to conduct a systematic review of the available research in this field to provide a thorough genes/proteins network meta-analysis on the impact of drug combinations on the management of heterozygous Familial Hypercholesterolemia (HeFH). This paper reviews and analyzes the literature on the effects of medication combinations on HeFH management. This study investigates articles that analyzed the management and adjuvants of HeFH to recommend forceful drug combinations. Methods: This systematic review and network meta-analysis analyzed the Science Direct, Embase, Scopus, PubMed, Web of Science (ISI), and Goo...
Using a three-dimensional layerwise-finite element method, the free vibration of thick laminated ... more Using a three-dimensional layerwise-finite element method, the free vibration of thick laminated circular and annular plates supported on the elastic foundation is studied. The Pasternak-type formulation is employed to model the interaction between the plate and the elastic foundation. The discretized governing equations are derived using the Hamilton's principle in conjunction with the layerwise theory in the thickness direction, the finite element (FE) in the radial direction and trigonometric function in the circumferential direction, respectively. The fast rate of convergence of the method is demonstrated and to verify its accuracy, comparison studies with the available solutions in the literature are performed. The effects of the geometrical parameters, the material properties and the elastic foundation parameters on the natural frequency parameters of the laminated thick circular and annular plates subjected to various boundary conditions are presented.
Uploads
Papers by Reza Bahadori