US – Page 439 – TechConnect Briefs

3D Biconjugate Gradient-Multi Grid Coupling Schemes for Field Equations in Semiconductor Device Simulation

Ayubi-Moak J., Wigger S., Goodnick S.M., Saraniti M., Arizona State University, US

A significant portion of the time required for simulating full three-dimensional (3D) charge transport in semiconductor devices using particle-based methods is spent solving the necessary field equations. Two highly effective, iterative techniques available for solving [...]

Analysis of Phonon Dispersion Relations From Atomic Model to Continuum Theory

Chen Y., Lee J.D., The George Washington University, US

The phonon dispersion relations calculated by atomic model: shell model and ab initio, and by microcontinuum theory are introduced in this paper. It is found that both atomic models and microcontinuum theory can describe the [...]

Mixing and Impulse Extremization in Microscale Vortex Formation

Mohseni K., University of Colorado, US

A key idea in microscale mixing, where the conventional turbulent mixing is not applicable, is to increase the area of the interface between two fluids. Significant entrainment and consequently mixing during vortex formation works based [...]

Computational Modeling of Fluidic Micro-Handling Processes

Mittal R., Seshadri V., Sarma S., Udaykumar H.S., The George Washington University, US

This paper describes the application of a new and unconventional numerical method for computational modeling of fluidic micro-handling processes. The key requirement for modeling such processes is the ability to simulate flows with large number [...]

Uncertainty Quantification in a Reacting Electrochemical Microchannel Flow Model

Debusschere B., Najm H., Matta A., Shu T., Knio O., Ghanem R., Le Maitre O., Sandia National Laboratories, US

We describe a technique for modeling electrochemical microchannel flows including the propagation of uncertainty from model parameters and boundary conditions to the model predictions. The approach uses a pseudo-spectral stochastic construction with a polynomial chaos [...]

Triangle Transducer for Micro Electro Mechanical Systems (MEMS) Simulation in ANSYS Finite Element Program

Gyimesi M., Ostergaard D., Avdeev I., ANSYS, Inc., US

The paper introduces a new methodology with a distributed triangle transducer for the strongly coupled simulation of micro electro mechanical systems (MEMS) in ANSYS Finite Element (FE) program.

Large Scale FDTD Simulation for Microoptics and Metamaterial Investigations – Current Possibilities and Verification Benchmarks

Hieke A., Tramel R., CFD Research Corporation, US

The study of microsystems containing photonic crystals (PC) and meta-materials are rapidly growing fields of research. Finite-Difference Time-Domain (FDTD) full wave electromagnetic solvers are now increasingly used to investigate and design such systems. However, in [...]

Efficient 3-D Numerical Code “FastSlipStokes” for Drag Force Calculation Due to Slip Flow

Ding J., Ye W., Georgia Institute of Technology, US

Drag force calculation due to slip flows is important in predicting the performance of the microstructures with minimum feature size around 1 mm. In this paper, an efficient numerical approach to compute the drag force [...]

Efficiency Improvements in Fast Stokes Solvers

De S., Wang X., White J.K., Massachusetts Institute of Technology, US

In this paper we present several techniques to improve the efficiency and accuracy of the precorrected FFT accelerated Fast Stokes solver based on a boundary element discretization of the integral form of the incompressible Stokes [...]

Dynamic Analysis of Electrostatic MEMS by Meshless Methods

Li G., Aluru N.R., University of Illinois at Urbana-Champaign, US

Electrostatically actuated microstructures are widely used in microelectromechanical systems (MEMS). Computational analysis of electrostatic MEMS requires a self-consistent solution of the interior elastic domain and the exterior electrostatic domain. This paper proposes an efficient approach [...]