The solution procedure for two phases in OpenFOAM suffers from unphysical velocity oscillations at the free surface between phases. It is likely that this problem also exists other two-phase Computational Fluid Dynamics (CFD) codes. We aim to solve by imposing boundary conditions directly on surface. have taken first step towards a new method addressing water phase alone. modelling based mergin...

Geophysic al flows over comp lex domains often encompass both coarse and highly resolved regions. Approxim ating these flows using shock-capturing methods with explicit timestep ping gives rise to a Courant–Friedrichs–Lewy (CFL) timestep constraint. This approach can result in small global timesteps often dictated by flows in small regions, vastly increasing computational effort over the whole ...

For solving partial differential algebraic equations (PDAEs), the space–time conservation element/solution element (CE/SE) method is addressed in this study. The method of lines (MOL) using an implicit time integrator is compared with the CE/SE method in terms of computational efficiency, solution accuracy and stability. The space–time CE/SE method is successfully implemented to solve PDAE syst...

Discontinuous Galerkin (DG) spatial discretizations are often used in a method-of-lines approach with explicit strong-stability-preserving (SSP) Runge– Kutta (RK) time steppers for the numerical solution of hyperbolic conservation laws. The time steps that are employed in this type of approach must satisfy Courant–Friedrichs–Lewy (CFL) stability constraints that are dependent on both the region...

Optimized operator splitting methods for numerical integration of the time domain Maxwell’s equations in computational electromagnetics (CEM) are proposed for the first time. The methods are based on splitting the time domain evolution operator of Maxwell’s equations into suboperators, and corresponding time coefficients are obtained by reducing the norm of truncation terms to a minimum. The ge...

In this work, an efficient way to predict the dynamics of a scalar at high Schmidt numbers, advected by a turbulent flow, is presented. For high Schmidt numbers, the spatial resolution required for the scalar field has to be finer than the resolution required for the velocity field, leading to a significant computational cost due to the CourantFriedrichs-Lewy (CFL) constraint. We propose here a...

Human ?-synuclein is a 140 amino acid protein with little or no secondary structure. The ?-synuclein is expressed at high levels in the brain and enriched in neural synaptic terminals but its physiological function remains largely unknown. More recently, ?-synuclein has been shown to be one of the principal componets of Lewy bodies, neuronal inclusions that are found in diverse human neurodegen...

Finite lumps of color-flavor locked strange-quark matter (CFL strangelets) are significantly more stable than strangelets without color-flavor locking for wide ranges of parameters, increasing the likelihood of strangelet metastability, or even absolute stability beyond some minimum baryon number A(min). Whereas bulk CFL strange-quark matter is electrically neutral, CFL strangelets are positive...

We examine the computational complexity of context-free languages, mainly concentrating on two well-known structural properties—immunity and pseudorandomness. An infinite language is REG-immune (resp., CFL-immune) if it contains no infinite subset that is a regular (resp., context-free) language. We prove that (i) there is a context-free REG-immune language outside REG/n and (ii) there is a REG...

Pterygophora californica Ruprecht, Eisenja arborea Areschoug and Laminana setchellii Silva are 3 common kelps (Laminariales, Phaeophyta) found in the shallow subtidal of open coastal British Columbia, Canada. Earlier laboratory studies showed that P. californica stipes had a cr~tical flaw length (CFL, the length of a flaw which, if exceeded, results in structural failure) of 0.2 mm. In this pap...