Computations of Multiphase Fluid Flows Using Marker-Based Adaptive, Multilevel Cartesian Grid Method

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76194/1/AIAA-2007-336-338.pd

A Unified Adaptive Cartesian Grid Method for Solid-Multiphase Fluid Dynamics with Moving Boundaries

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76397/1/AIAA-2007-4576-676.pd

Globalisation, the European Union and Turkey: rethinking the struggle over hegemony

The research approaches Turkish membership question to the European Union as an open-ended struggle among social forces. It aims to address whether there is a hegemonic pro-membership perspective and if any, which social forces are supporting it. Is there any alternative contesting and resisting membership and neo-liberal restructuring? Can disadvantaged groups from globalisation form a united struggle, and if not, how can we account for the lack of an alternative? At the theoretical level, it dismisses mainstream integration theories as debate is mainly stuck to the dichotomy between membership or not (form of integration), that in return is a non-debate. It introduces Gramscian historical materialist framework that paves the way to account for socio-economic content and power relations underpinning ongoing integration process. The argument proceeds by delving into a debate on theoretical coordinates regarding hegemony in Gramscian analyses and the theory of discourse introduced by Laclau and Mouffe in the Hegemony and Socialist Strategy. Ultimately, it dismisses theory of discourse and conceives class struggle in relation to discipline of capital over society within social relations of production. The empirical data relies on semi-structured interviews conducted with capital and labour, political parties, state officials and women rights/feminist groups and human rights groups. Additionally, particular sectors, textile, automotive and agriculture are examined in parallel with Gramscian historical materialist coordinates on intra-class struggle. I shall argue that pro-membership perspective, whose socio-economic content is consolidation of neo-liberal restructuring, is hegemonic. It is pioneered by internationally oriented capital and conveyed as the means to stimulate competitiveness and economic growth and to consolidate democracy. It draws support from nationally oriented capital analogous with delocalization of production and integration to transnational production via outsourcing and contract manufacturing. Yet, it is possible to identify two rival class strategies that contest neo-liberal pro-membership project, neo-mercantilism that is supported by nationally oriented labour, nationalist political parties, centre-left political parties and Ha-vet (No-Yes) that is underpinned by internationally oriented labour, social democratic fraction among the Left, particular women rights groups and human rights groups. On the one hand, position of social forces underpinning neo-mercantilism is weakened in economy and ideas that echo import-substitution policy under Keynesian welfare state regime and developmentalist state in periphery are defeated analogous with globalisation and neo-liberal restructuring. The only criticism of neo-mercantilist project remains on national sensitivities. Put bluntly, the critique is anti-imperialist though not anti-capitalist. At the final analysis, membership is interpreted in relation to modernization and westernization with a populist discourse. On the other hand, although social forces within Ha-vet read European Union as a capitalist economic integration model, they conceive internationalisation of labour and European Social Model as the only viable mechanism to struggle against globalization and transnationalisation of production. Moreover, European integration is received positively as a democratization project. Ultimately, neither neo-mercantilism that supports ‘membership on equal terms and conditions’, nor Ha-vet that adopts the motto of ‘another globalisation and Europe is possible’, stands as an overall alternative

Continuous quantum measurement of a Bose-Einstein condensate: a stochastic Gross-Pitaevskii equation

We analyze the dynamics of a Bose-Einstein condensate undergoing a continuous dispersive imaging by using a Lindblad operator formalism. Continuous strong measurements drive the condensate out of the coherent state description assumed within the Gross-Pitaevskii mean-field approach. Continuous weak measurements allow instead to replace, for timescales short enough, the exact problem with its mean-field approximation through a stochastic analogue of the Gross-Pitaevskii equation. The latter is used to show the unwinding of a dark soliton undergoing a continuous imaging.Comment: 13 pages, 10 figure

Projected SO(5) Hamiltonian for Cuprates and Its Applications

The projected SO(5) (pSO(5)) Hamiltonian incorporates the quantum spin and superconducting fluctuations of underdoped cuprates in terms of four bosons moving on a coarse grained lattice. A simple mean field approximation can explain some key feautures of the experimental phase diagram: (i) The Mott transition between antiferromagnet and superconductor, (ii) The increase of T_c and superfluid stiffness with hole concentration x and (iii) The increase of antiferromagnetic resonance energy as sqrt{x-x_c} in the superconducting phase. We apply this theory to explain the ``two gaps'' problem found in underdoped cuprate Superconductor-Normal- Superconductor junctions. In particular we explain the sharp subgap Andreev peaks of the differential resistance, as signatures of the antiferromagnetic resonance (the magnon mass gap). A critical test of this theory is proposed. The tunneling charge, as measured by shot noise, should change by increments of Delta Q= 2e at the Andreev peaks, rather than by Delta Q=e as in conventional superconductors.Comment: 3 EPS figure

Adaptive Lagrangian–Eulerian computation of propagation and rupture of a liquid plug in a tube

Liquid plug propagation and rupture occurring in lung airways can have a detrimental effect on epithelial cells. In this study, a numerical simulation of a liquid plug in an infinite tube is conducted using an Eulerian–Lagrangian approach and the continuous interface method. A reconstruction scheme is developed to allow topological changes during plug rupture by altering the connectivity information about the interface mesh. Results prior to the rupture are in reasonable agreement with the study of Fujioka et al . in which a Lagrangian method is used. For unity non‐dimensional pressure drop and a Laplace number of 1000, rupture time is shown to be delayed as the initial precursor film thickness increases and rupture is not expected for thicknesses larger than 0.10 of tube radius. During the plug rupture process, a sudden increase of mechanical stresses on the tube wall is recorded, which can cause tissue damage. The peak values of those stresses increase as the initial precursor film thickness is reduced. After rupture, the peaks in mechanical stresses decrease in magnitude as the plug vanishes and the flow approaches a fully developed behavior. Increasing initial pressure drop is shown to linearly increase maximum variations in wall pressure and shear stress. Decreasing the pressure drop and increasing the Laplace number appear to delay rupture because it takes longer for a fluid with large inertial forces to respond to the small pressure drop. Copyright © 2010 John Wiley & Sons, Ltd.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/88023/1/2422_ftp.pd

Parallel Eulerian-Lagrangian Method with Adaptive Mesh Refinement for Moving Boundary Computation

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/106477/1/AIAA2013-370.pd

Parallel, Adaptive Grid Computing of Multiphase Flows in Spacecraft Fuel Tanks

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/97138/1/AIAA2012-761.pd

Interfacial flow computations using adaptive Eulerian–Lagrangian method for spacecraft applications

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/90518/1/fld2475.pd