Multiphase flow simulation through porous media with explicitly resolved fractures

Accurate simulation of multiphase flow in fractured porous media remains a challenge. An important problem is the representation of the discontinuous or near discontinuous behaviour of saturation in real geological formations. In the classical continuum approach, a refined mesh is required at the interface between fracture and porous media to capture the steep gradients in saturation and saturation‐dependent transport properties. This dramatically increases the computational load when large numbers of fractures are present in the numerical model. A discontinuous finite element method is reported here to model flow in fractured porous media. The governing multiphase porous media flow equations are solved in the adaptive mesh computational fluid dynamics code IC‐FERST on unstructured meshes. The method is based on a mixed control volume – discontinuous finite element formulation. This is combined with the P_N+1DG‐P_NDG element pair, which has discontinuous (order N+1) representation for velocity and discontinuous (order N) representation for pressure. A number of test cases are used to evaluate the method's ability to model fracture flow. The first is used to verify the performance of the element pair on structured and unstructured meshes of different resolution. Multiphase flow is then modelled in a range of idealised and simple fracture patterns. Solutions with sharp saturation fronts and computational economy in terms of mesh size are illustrated.     

Linking Agricultural Policies with Decision-Making: A Spatial Approach

Abstract

The loss of agricultural land and its implications have been of great concern in the last decade. By undertaking a spatial analysis of the appropriation of agricultural land for urban use with an overlay of population and urban data, a focus on the consequences of certain regulations on the dynamics of land-use change is explored. This is achieved by integration of data inventories of agricultural land use for Portugal, and linking this information with CORINE Land Cover data as to assess change in the Algarve. An integrated assessment of agricultural land loss follows, undermined by the consequences of urban sprawl. In this sense, this paper expands on the currently existing decrees which provide support to sustainable development in the region while providing a qualitative assessment of future roles based on ethical values and economic efficiency and offering a feasible framework for policy-makers regarding the trends of urban/agricultural dichotomy in a planning and decision-making context.     

Old dogs and new tricks: Recent developments in our understanding of the human–dog relationship

The reemergence of cognitive studies in comparative psychology and ethology, coupled with ongoing archaeological discoveries and recent advances in genomics, have contributed to the current explosion of scientific interest in dogs (Canis lupus familiaris). The long and complex evolution of a human-dog relationship is explored from the differing perspectives of ethology, cognitive sciences, evolutionary anthropology, archaeology, and paleoanthropology. Our understanding of dogs is again shedding light on human cognitive evolution and the complex, and at times controversial, process of domestication.     

The Future of Utopia

The widespread notion that the city is secular and that therefore society’s future is secular is in need of serious reconsideration. This paper argues that religion does not melt away but rather morphs into modern forms of aspiration, speculation, and contention. Religion is therefore crucial to social inquiry into the nature of the urban. The paper argues that in Asia the Christian modern is close to the secular modern with fragments of rational planning and calculation in constant interplay with fragments of the magic of speculative modernity. Both communism and market capitalism are ideological cousins of Christian millenarianism. In a comparison of India, China, and Singapore it argues that the Christian form of modernity has been much better able to penetrate and coalesce with Sinic civilizational traditions than with Indic civilizational traditions.     

Intimate citizenship? Rethinking the politics and experience of citizenship as emotional in Wales and Singapore

Conversations around, and conceptions of, citizenship have changed over time. Assumed initially as a mark of membership, of belonging to a political community (Marshall 1950), the essence of what it means to be a citizen and what the contractual ties of citizenship are have evolved over time. This evolution has been encouraged by processes of migration and increasing mobility. More recently, our ability to traverse geographical and political boundaries has meant that notions of borders and boundaries, of who belongs where and why, have also been subject to dramatic changes. This article investigates the impact of such mobility on the individual lived experience of migrant women who, as a group, have been traditionally excluded from more formal political arenas, and asks questions of what citizenship means for them. Though I do not contest the very political fact of citizenship as status, this article challenges the way in which the nature of this status is assumed or implied for all. This article therefore argues that citizenship itself is a much more fluid concept, incorporating the emotional and lived experience of individuals and that it is in these emotional accounts through which citizenship, and its extended rights and political capabilities, must be understood through a sense of everyday, grounded and personal politics.     

Spatial variation in cervical cancer screening participation and outcomes among Indigenous and non‐Indigenous Australians in Queensland

Indigenous women continue to experience a disproportionately higher burden of cervical cancer than non‐Indigenous women in Australia. The National Indigenous Cervical Screening Project used probabilistic record linkage to combine population‐based administrative databases and identify Indigenous women on Pap Smear Registers. This study aimed to quantify the spatial variation by local government areas (LGAs) for Indigenous and non‐Indigenous women in Queensland in cervical screening participation rates and related outcomes. Empirical Bayes local geostatistical smoothing was performed to reduce the likelihood of spurious variation between small areas. The cohort included 1,091,260 women (2 per cent Indigenous) aged 20 to 69 with 2,393,708 Pap smears between 2006 and 2011. Indigenous women had smoothed LGA‐specific 5‐year participation rates (interquartile range (IQR) 38.9–53.3 per 100 eligible women) consistently lower than non‐Indigenous women (IQR 80.7–85.3). The non‐overlapping confidence intervals of these rates suggest that the Indigenous differential was significant. Compared with Indigenous women, non‐Indigenous women had consistently lower and more stable prevalence rates of histologically confirmed high grade abnormalities (IQR 8.0–10.1 versus 15.0–21.3 per 1,000 screened women). Although the LGA‐specific rates also suggest that a higher proportion of non‐Indigenous women were followed‐up within two months of an abnormal screening result, the wide confidence intervals for these estimates limit our ability to draw definitive conclusions about spatial patterns for this outcome. These findings highlight the importance of continued monitoring and ongoing efforts to identify drivers of these patterns and develop effective strategies to improve participation and potentially reduce the cervical cancer burden among Indigenous women.