Model-based treatment planning and exposimetry for high-intensity focused ultrasound requires the numerical simulation of nonlinear ultrasound propagation through heterogeneous and absorbing media. This is a computationally demanding problem due to the large distances travelled by the ultrasound waves relative to the wavelength of the highest frequency harmonic. Here, the k-space pseudospectral...

| In our eeort to meet an increasing demand for more accurate and realistic nonlinear optics simulations, we have developed a nonlinear hybrid vector nite element method (NL-HVFEM) to study different phenomena due to wave propagation in waveg-uides lled with nonlinear Kerr-type media. Contrary to the most existing scalar models, the NL-HVFEM approach is based upon the vector Helmholtz equation ...

Future Si-based analog and digital highly integrated Microwave Monolithic Integrated Circuits (MMIC) are expected to operate at frequencies up into the millimeter-wave range. Further reduction of circuit dimensions will require multilayered wiring and transmission line structures with cross-sectional dimensions of the conductors in the order of micrometers. In order to achieve further reduction...

A new 2-D full-wave code has been developed to simulate ordinary (O) mode reflectometry signals caused by plasma density fluctuations. The code uses the finite-difference time-domain method with a perfectly-matched-layer absorption boundary to solve Maxwell’s equations. Huygens wave sources are incorporated to generate Gaussian beams. The code has been used to simulate the reflectometer measure...

We present a hybrid numerical method that combines full-wave analysis with ray-tracing to efficiently model propagation in reconfigurable intelligent surface (RIS)-enabled communication channels. Full-wave simulation is used obtain the radiation pattern of transmitter and complex radar cross section (RCS) RIS. Then, RIS imported into ray-tracer as secondary transmitter. That enables modeling in...

We present the validation and application of a numerical model for the simulation of wave-induced sediment transport. Our approach is a oneway coupling of an inviscid flow model (i.e., a Numerical Wave Tank based on potential flow theory; NWT) to a Navier-Stokes solver, to simulate near bottom wave-induced turbulent boundary layer flows. Only two-dimensional incident wave fields have been consi...

Lower hybrid (LH) waves have the attractive property of damping strongly via electron Landau resonance on relatively fast tail electrons at (2.5−−3)× vte, where vte ≡ (2Te/me) is the electron thermal speed. Consequently these waves are well-suited to driving current in the plasma periphery where the electron temperature is lower, making LH current drive (LHCD) a promising technique for off-axis...

We present a Newton-CG method for full-waveform seismic inversion. Our method comprises the adjoint-based computation of the gradient and Hessianvector products of the reduced problem and a preconditioned conjugate gradient method to solve the Newton system in matrix-free fashion. A trust-region globalization strategy and a multi-frequency inversion approach are applied. The governing equations...

We report the status of CMS full simulation for Run 3. During long shutdown LHC a significant update has been introduced to code simulation. The geometry description is reviewed. Several important modifications were needed. detector software migrated DD4Hep community developed tool. will on our experience obtained during process this migration. Geant4 10.7 choice 3 productions. discuss argument...