Extended self-similar scaling law of multi-scale eddy structure in wall turbulence

The longitudinal fluctuating velocity of a turbulent boundary layer was measured in a water channel at a moderate Reynolds number. The extended self-similar scaling law of structure function proposed by Benzi was verified. The longitudinal fluctuating velocity, in the turbulent boundary layer was decomposed into many multi-scale eddy structures by wavelet transform. The extended self-similar scaling law of structure function for each scale eddy velocity was investigated. The conclusions are I) The statistical properties of turbulence could be self-similar not only at high Reynolds number, but also at moderate and low Reynolds number, and they could be characterized by the same set of scaling exponents xi (1)(n) = n/3 and xi (2)(n) = n/3 of the fully developed regime. 2) The range of scales where the extended self-similarity valid is much larger than the inertial range and extends far deep into the dissipation range,vith the same set of scaling exponents. 3) The extended selfsimilarity is applicable not only for homogeneous turbulence, but also for shear turbulence such as turbulent boundary layers.

Supersonic dusty-gas flows with Knudsen effect in interphase momentum exchange

On the basis of the two-continuum model of dilute gas-solid suspensions, the dynamic behavior of inertial particles in supersonic dusty-gas flows past a blunt body is studied for moderate Reynolds numbers, when the Knudsen effect in the interphase momentum exchange is significant. The limits of the inertial particle deposition regime in the space of governing parameters are found numerically under the assumption of the slip and free-molecule flow regimes around particles. As a model problem, the flow structure is obtained for a supersonic dusty-gas point-source flow colliding with a hypersonic flow of pure gas. The calculations performed using the full Lagrangian approach for the near-symmetry-axis region and the free-molecular flow regime around the particles reveal a multi-layer structure of the dispersed-phase density with a sharp accumulation of the particles in some thin regions between the bow and termination shock waves.

Examination of the LBM in simulation of microchannel flow in transitional regime

The gas flows in micro-electro-mechanical systems possess relatively large Knudsen number and usually belong to the slip flow and transitional flow regimes. Recently the lattice Boltzmann method (LBM) was proposed by Nie et al. in Journal of Statistical Physics, vol. 107, pp. 279-289, in 2002 to simulate the microchannel and microcavity flows in the transitional flow regime. The present article intends to test the feasibility of doing so. The results of using the lattice Boltzmann method and the direct simulation Monte Carlo method show good agreement between them for small Kn (Kn = 0.0194), poor agreement for Kn = 0.194, and large deviation for Kn = 0.388 in simulating microchannel flows. This suggests that the present version of the lattice Boltzmann method is not feasible to simulate the transitional channel flow.

Licitações - Regime Diferenciado de Contratações Públicas - RDC : Medida Provisória 521, de 2010

Consultoria de Orçamento e Fiscalização Financeira.

Regime Geral de Previdência Social - 2003 a 2009

Consultoria de Orçamento e Fiscalização Financeira - Núcleo Trabalho, Previdência e Assistência Social.

Aspectos sobre a regulação do regime jurídico de policiais militares dos ex-territórios federais

Consultoria Legislativa - Área XVII - Segurança Pública e Defesa Nacional.

Regime jurídico do servidor público nos Estados Unidos

Consultoria Legislativa - Área XIX - Ciência Política, Sociologia Política, História, Relações Internacionais.

Simplificação do regime jurídico do pequeno empresário: análise do projeto de lei complementar nº 210/2004

Análise do projeto de lei complementar nº 210, de 2004, de iniciativa do poder executivo, que institui regime tributário, previdenciário e trabalhista especial à microempresa com receita bruta anual de até R$36.000,00 e dá outras providências.

Estudo pormenorizado da situação dos secretários parlamentares contratados pelo regime da CLT com pelo menos cinco anos de tempo de serviço à data da promulgação da Constituição Federal de 1988, visando subsidiar decisão da administração superior da Casa sobre reivindicações de vínculo pelo RJU

Consultoria Legislativa - Área VIII - Administração Pública.

Alteração na metodologia de cálculo da tábua de expectativa de sobrevida para 2002 e seus reflexos no regime geral de previdência social

Consultoria Legislativa - Área XXI - Previdência e Direito Previdenciário.

Influence of inertial and thermal effects on the dynamic growth of voids in porous ductile materials

The influence of inertial, thermal and rate - sensitive effects on the void growth at high strain rate in a thermal - viscoplastic solid is investigated by means of a theoretical model presented in the present paper. Numerical analysis of the model suggests that inertial, thermal and rate - sensitive effects are three major factors which greatly influence the behavior of void growth in the high strain rate case. Comparison of the mathematical model proposed in the present work and Johnson's model shows that if the temperature - dependence is considered, material viscosity eta can take the experimentally measured values.