This paper focuses on a hydraulic radius separation approach used to calculate the boundary shear stress in terms of bed and wall shear stress proposed in a trapezoidal channel. The average bed and sidewall shear stress in smooth trapezoidal open channels are derived after using Guo & Julien (2005) early equations taking a part of an investigation to cover both rectangular and trapezoidal chann...

The formation mechanism of the Santa Cruz eddy (SCE) is investigated using the fifth-generation Pennsylvania State University–National Center for Atmospheric Research Mesoscale Model (MM5). Simulations of 25–26 August 2000 showed that two eddy instances formed on that night, a finding supported by observations. The two eddies had similar behavior: they both formed in the sheltered Santa Cruz, C...

Predicting the behavior of turbulent flows using large-eddy simulation requires a modeling subgrid-scale stress tensor. This tensor can be approximated mixed models, which combine dissipative nature functional models with capability structural to approximate out-of-equilibrium effects. We propose mathematical basis mix (functional) eddy-viscosity (structural) Bardina model. By taking an anisotr...

Additional experiments with the slowly varying axisymmetric hurricane model described by Anthes are presented. Variable horizontal eddy viscosity coefficients are utilized to study circulations that result from an increased heating function and a heating function with a double maximum along the radial direction. Infrared radiative cooling is modeled for the clear tropical atmosphere following S...

An eddy viscosity model for two-dimensional breaking waves and its validation with laboratory experiments Zhigang Tian,1 Marc Perlin,2 and Wooyoung Choi1,3 1Division of Ocean Systems Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea 2Department of Naval Architecture and Marine Engineering, University of Michigan, Ann Arbor, Michigan, USA 3Department o...

We are presenting the results of a stability analysis of a background wind shear in the presence of stablestratification and of height dependent coefficients of eddy viscosity and eddy thermal conduction. It is shownthat the vertical gradients of the eddy coefficients substantially affect the phase velocities, growth rates andvertical structure of the gravity wave and are respon...

It is well known that the barotropic, wind-driven, single-gyre ocean model reaches an inertiallydominated equilibriumwith unrealistic circulation strength when the explicit viscosity is reduced to realistically low values. It is shown here that the overall circulation strength can be controlled nonlocally by retaining thin regions of enhanced viscosity parameterizing the effects of increased mi...

A total of four moorings from POLYMODE Array I and II were analyzed in an investigation of internal wavefield-mean flow interactions. In particular, evidence for wave-mean flow interaction was sought by searching for time correlations between the wavefield vertically-acting Reynolds stress (estimated using the temperature and velocity records), and the mean shear. No significant stress-shear co...

The large-eddy simulation of the spatial evolution of a stationary cross ow vortex packet in a three-dimensional boundary layer was performed. Although a coarse grid was used (compared to that required by a direct numerical simulation) the essential features of the disturbance evolution, such as the spanwise disturbance spreading and the vortex rollover, were captured accurately. The eddy visco...