Using the Maximum Pressure Principle for Verification of Calculation of Stationary Subsonic Flow

Abstract

The principle of maximum pressure for subsonic stationary three-dimensional vortex flows of an ideal gas (author Sizykh G.B., 2018) is applied to verify the calculation method and its implementation on a specific computer technology. The four criteria for solution's verification are proposed. The method for obtaining flow parameters is based on solving of discrete analogs of the Navier --- Stokes system of equations on three-dimensional non-structured computational meshes. For example, there was consider the vortex tear-off flow around the fuselage of a helicopter with an empennage and landing gear at obviously insufficient computing resources. Conclusions of the feasibility of applying the author's criteria for evaluation of a particular calculation and for estimation of reliability of the results have been made.

Creation of Polymer Coatings for Improving of Protective Properties of Surfaces

“…From the point of view of strength calculations, thin-walled metal structural elements with polymer coatings can be presented in the form of two-or three-layer plates (depending on whether the coating is applied on one or both sides) with a tougher metal middle layer and much more pliable outer layers-coatings [25][26][27]. Currently, not many experimental and theoretical works are known in which the analysis of the macroscopic mechanical behavior of such structural elements is carried out taking into account the effects of the influence of residual stresses [28][29][30]. It is possible to note a wide variety of works in the field of research of functional-gradient thinwalled structures with coatings (see, for example, [26][27][28] and references therein).…”

Effect of Shape of Armoring Fibers on Strength of Composite Materials

“…However, well-known studies were carried out mainly for the case of quasistatic loading of materials. The effects of strain rate influence on the strength of composites with bent fibers have been studied to a much lesser extent, although they have also been considered [27][28][29][30][31][32][33][34][35]. Analytical and numerical models are proposed to take into account the effects of curved stacking and the effect of fiber curvature.…”

Effect of High Velocity Deformation on Strength of ArmoredComposite Materials

“…However, well-known studies were carried out mainly for the case of quasi-static loading of materials [17][18][19][20][21][22][23][24][25]. The effects of strain rate influence on the strength of composites with curved fibers have been studied to a much lesser extent, although they have also been considered.…”