How to select discretization scheme in comsol 5.3

#HOW TO SELECT DISCRETIZATION SCHEME IN COMSOL 5.3 SERIES#

However, a considerable number of reinforced concrete structures cannot achieve its design service life because of premature durability problems. Reinforced concrete (RC) structures form the basis for most construction in civil engineering. These results indicate that MWLS and EFG are reliable meshless methods that can be used for the prediction of chloride ingress in concrete structures. A good agreement is obtained among MWLS and EFG numerical simulations and the experimental data obtained from an existing marine concrete structure. One- and two-dimensional numerical examples validated the effectiveness and accuracy of the two meshless methods by comparing results obtained by MWLS with results computed by EFG and FEM and results calculated by an analytical method. The range of a scaling parameter is presented using numerical examples based on meshless methods. In this study, element-free Galerkin (EFG) and meshless weighted least squares (MWLS) methods are used to solve the problem of simulation of chloride diffusion in concrete. The numerical simulation methods at present mainly involve finite element methods (FEM), which are based on mesh generation. Many tutorial models have been updated with more efficient mesh and parametric sweep settings, leading to the speedup of computation up to a factor of 10.Degradation of RC structures due to chloride penetration followed by reinforcement corrosion is a serious problem in civil engineering. With the enhanced formulation, better accuracy is achieved with a coarser mesh.

#HOW TO SELECT DISCRETIZATION SCHEME IN COMSOL 5.3 SERIES#

This series of models includes the effect of band gap narrowing that has been improved. The MOSFET series of tutorials are updated with a user-defined mesh that is coarser, for faster computations.

Tutorial Model Improvements MOSFET Series of Tutorials

Fixed formulation for the case of user-defined Schottky barrier height in the Metal Contact boundary condition.

Corrected Fermi-Dirac variable definitions for finite element log formulation.

The MOSFET tutorials, which use the band-gap narrowing feature, are affected.

Fixed the formulation for band-gap narrowing (FVM and FEM), position-dependent band gap (FVM), and carrier diffusion due to temperature gradient (FVM).

Improved consistency of continuation parameter scaling among all doping profile types.

Improved high field mobility model behavior at low currents.

Automatic setup of the constraint value for the electric potential at a Metal Contact with user-defined Schottky barrier height.

Improved finite volume formulation for incomplete ionization, spatially varying electron affinity and band gap, and consistency with the thermal equilibrium condition.

The result for a large number of particles compares well with the Thomas-Fermi approximation as expected.Д¬-V curves for the low- and high-frequency cases.ДЄpplication Library path: Semiconductor_Module/Device_Building_Blocks/moscap_1d_small_signal Enhancements and Bug Fixes Instead, a stationary study is used with a global equation enforcing the normalization of the wave function to solve for the ground-state solution. The eigenvalue study is not suitable for solving this kind of nonlinear eigenvalue problem. The equation is essentially a nonlinear single-particle SchrГ¶dinger equation, with a potential energy contribution proportional to the local particle density.

This tutorial model solves the Gross-Pitaevskii equation for the ground state of a Bose-Einstein condensate in a harmonic trap, using the SchrГ¶dinger Equation physics interface in the Semiconductor Module. New Tutorial Model: Gross-Pitaevskii Equation for Bose-Einstein Condensation This helps the study of various scattering phenomena. In addition to the Open Boundary condition for outgoing waves, the Perfectly Matched Layer (PML) functionality is added to the SchrГ¶dinger Equation interface to absorb outgoing waves for stationary studies. PML for the SchrГ¶dinger Equation Interface The expanded functionality allows more flexibility in studying systems with complex trap properties, in particular its dynamics. The energy discretization, the energy range, and number of mesh points along the energy axis can also be tailored individually for each continuous energy level subnode. The functionality of the Trapping feature is expanded so that users can enter the initial trap occupancy and the degeneracy factor individually for each discrete or continuous energy level subnode. Voir la copie d'Г©cran Trapping Functionality

How to select discretization scheme in comsol 5.3