78 research outputs found
Large eddy simulation within the smoothed particle hydrodynamics: Applications to multiphase flows
No full textIn this paper, the large eddy simulation (LES) model introduced in the smoothed particle hydrodynamics (SPH) by Di Mascio et al. [Phys. Fluids 29, 035102 (2017)] and called d-LES-SPH, is extended to treat multiphase flows. This is achieved by modifying the multiphase d-SPH by Hammani et al. [Comput. Methods Appl. Mech. Eng. 368, 113189 (2020)] by switching the viscous and density diffusion constants to dynamic variables evaluated as turbulence closure terms. The equation for energy conservation is also written for the presented model. The validation is performed for two-dimensional problems, by comparison with other established SPH solvers, with a finite volume method solver based on the turbulence closure corresponding to that adopted for the Lagrangian scheme, and with experimental data. The first test case investigated is a modified Taylor-Green vortex in which the introduction of macro-bubbles of a lighter fluid phase inside the domain is considered. In the second test case, a more violent problem involving wave breaking and splashing dynamics is analyzed. In the final test, the dynamic of a sloshing problem is reproduced. An analysis of turbulence resolution is conducted by considering modeled and resolved turbulent kinetic energies, as well as viscous dissipation and turbulent viscosity dissipation
Radical Roots
No full textWhile all history has the potential to be political, public history is uniquely so: public historians engage in historical inquiry outside the bubble of scholarly discourse, relying on social networks, political goals, practices, and habits of mind that differ from traditional historians. Radical Roots: Public History and a Tradition of Social Justice Activism theorizes and defines public history as future-focused, committed to the advancement of social justice, and engaged in creating a more inclusive public record. Edited by Denise D. Meringolo and with contributions from the field’s leading figures, this groundbreaking collection addresses major topics such as museum practices, oral history, grassroots preservation, and community-based learning. It demonstrates the core practices that have shaped radical public history, how they have been mobilized to promote social justice, and how public historians can facilitate civic discourse in order to promote equality
Radical Roots
No full textWhile all history has the potential to be political, public history is uniquely so: public historians engage in historical inquiry outside the bubble of scholarly discourse, relying on social networks, political goals, practices, and habits of mind that differ from traditional historians. Radical Roots: Public History and a Tradition of Social Justice Activism theorizes and defines public history as future-focused, committed to the advancement of social justice, and engaged in creating a more inclusive public record. Edited by Denise D. Meringolo and with contributions from the field’s leading figures, this groundbreaking collection addresses major topics such as museum practices, oral history, grassroots preservation, and community-based learning. It demonstrates the core practices that have shaped radical public history, how they have been mobilized to promote social justice, and how public historians can facilitate civic discourse in order to promote equality
Radical Roots
No full textWhile all history has the potential to be political, public history is uniquely so: public historians engage in historical inquiry outside the bubble of scholarly discourse, relying on social networks, political goals, practices, and habits of mind that differ from traditional historians. Radical Roots: Public History and a Tradition of Social Justice Activism theorizes and defines public history as future-focused, committed to the advancement of social justice, and engaged in creating a more inclusive public record. Edited by Denise D. Meringolo and with contributions from the field’s leading figures, this groundbreaking collection addresses major topics such as museum practices, oral history, grassroots preservation, and community-based learning. It demonstrates the core practices that have shaped radical public history, how they have been mobilized to promote social justice, and how public historians can facilitate civic discourse in order to promote equality
On the interaction between waves and perforated breakwaters with Smoothed Particle Hydrodynamics
No full textIntermittent access heroin self-administration increases drug intake in both sexes and relapse vulnerability in female rats
No full textDrug seeking gradually increases during abstinence (incubation of craving). Most studies of this phenomenon used continuous access self-administration procedures. Recently, studies using intermittent access self-administration procedure, showed increased motivation to take and seek drugs. We compared the effect of these two procedures on heroin intake, pattern of self-administration, modeled brain levels of heroin and its metabolites and incubation of craving, after forced or voluntary abstinence. We trained male and female rats to self-administer a palatable solution and then heroin (0.075 mg/kg) either continuously (6-h/d; 10d) or intermittently (6-h/d; 5-m/30-m; 10d). Next, we tested heroin seeking after 1 or 21 abstinence days. Between tests, rats underwent either forced or voluntary abstinence. We modeled brain levels of heroin and its metabolites during self-administration and assessed female estrous cycle after relapse tests. Intermittent access increased heroin intake, induced higher spikes of heroin and 6-acetylmorphine brain levels and increased heroin seeking in early abstinence. In both sexes, continuous access determined incubation of craving after forced, but not voluntary abstinence. Heroin seeking was higher in females after intermittent but not continuous access, independently of the estrous cycle phase. Intermittent access mimics critical features of heroin addiction: drug bingeing and high relapse in early abstinence
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