1,721,180 research outputs found
Effects of Molecular Complexity and Reservoir Conditions on the Discharge Coefficient of Adapted Planar Nozzles
Full text linkThe transonic flow at throat section of a convergent-divergent nozzle is studied in adapted conditions to assess the influence of the fluid molecular complexity and total thermodynamic state on the discharge coefficient. The standard Sauer method is applied to solve the transonic perturbation potential equation in the vicinity of the nozzle throat. An analytic expression is derived that allows one to compute the discharge coefficient in terms of the nozzle curvature at the throat section and of the value of the fundamental derivative of gasdynamics at sonic conditions, which depends on the fluid molecular complexity and on the thermodynamic state in the reservoir. A linear dependence of the discharge coefficient on the sonic value of the fundamental derivative of gasdynamics is exposed
Nonclassical gasdynamics: thermodynamic modeling and numerical simulation of multidimensional flows of BZT fluids
No full textNozzle Design for Supersonic Flows of N2O at Supercritical and Close-to-Critical Conditions
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Recent Developments and Future Challenges in Compressible Flows of Substances Governed by Complex Thermodynamic Models
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Numerical Experiments on the Polygonalization of Converging Shock Waves by Means of Aerodynamic Obstacles
No full textAutomatic Tracking of Corona Propagation in Three-Dimensional Simulations of Non-Normal Drop Impact on a Liquid Film
No full textA novel procedure for tracking the propagation of the corona observed after the impact of liquid drops on thin films is proposed for the case of non-normal drop impacts. Three-dimensional adaptive-grid simulations are performed for different impingement angles and Weber numbers. In the numerical model, the Navier-Stokes equations are complemented with the Volume-Of-Fluid (VOF) method to model the gas-liquid interface. In the considered cases, the main features of the corona dynamics determined using the proposed technique are consistent with the three-dimensional description of the flow
Assessment of dynamic adaptive grids in Volume-Of-Fluid simulations of oblique drop impacts onto liquid films
Full text linkGrid spacing dependence in three-dimensional numerical simulations of non-normal drop impact onto thin liquid films is assessed for different impingement angles and grid refinement levels. To describe the liquid phase dynamics, the Navier–Stokes equations are coupled to a Volume-Of-Fluid (VOF) model. Numerical simulations are performed with a modified version software OpenFOAM over a structured grid of hexaedra. Grid adaptation is carried out using an edge subdivision technique which results in non-conformal meshes. Grid convergence is assessed by monitoring integral parameters describing the dynamics of the post-impact free-surface waves. Starting from an initial grid spacing between D/8D/8 and D/5D/5, with DD drop diameter, a refinement level of three is found to be sufficient to describe the diverse flow feature and to identify the splashing regime
Failure of Geometric Conservation Law for Non-Uniform Flow Simulations on Dynamic Meshes
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