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In recent decade, modernism as one of the varieties of post-postmodernism, draws interest of the researchers. It is suggested that modern culture has transgressed the situation of postmodernism, gravitating towards conceptual and semantic sustainability. As a language of self-description of the new era, the foundations of metamodernism are reflected in various forms of art. The opera house, overcoming the inertia of conservatism, perceives these trends, refracting them in a characteristic oscillation between the extreme semantic poles, which formed during the period of antiquity. The subject of this research is the correlation between the ancient musical heritage and metamodernistic trends in the modern opera theater. It is determined that translation of the principles of musical score of the ancient cult within the framework of the works of modern opera directors implies the characteristic to the supporting music of the cult forms of Ancient Greece and Rome oscillation between the poles of monophony – polyphony, instrumentality of accompaniment – a cappella, improvisational – preset of musical pieces. Paradigmatic assimilation of the fluctuations inherent to the cult of antiquity, as well as the absence of intentionality in their manifestations (which partially reflects the religious-ecstatic procedurality of art), largely determine the specific attributes of metamodernism, emphasized in the works of R. Castellucci, P. Sellars, R. Wilson, and D. Chernyakov.

We used contemporary computational fluid dynamics techniques to evaluate how the geometric parameters of a recessed nozzle affect the perfection of flow processes. We verified our numerical simulation and obtained acceptable agreement between numerical and experimental investigation results in terms of specific impulse loss. We plotted the discharge coefficient as a function of the geometrical parameters of a recessed nozzle. Our numerical investigation forms the basis of certain guidelines we developed for designing arc-based recessed nozzles.

The effect of ablation on the discharge characteristics of solid rocket engines with submerged nozzles is examined. State-of-the-art computational fluid dynamics software package ANSYS Fluent is employed for simulation. The ablation is considered from the standpoint of the effect caused by uniform blowing of degradation products on the boundary layer developing over the entrance length of the submerged nozzle. Different masses of injected substance are considered. The impact of injection on velocity profiles is estimated. The discharge coefficient is affected by the non-isothermal boundary layer when degraded thermal protection material is injected and chemical reactions are neglected. The effect of injection on the profiles of velocity and temperature, and hence, on discharge characteristics is revealed.