Unsteady  ow evolution in a porouschamberwith surfacemass injection simulatinga nozzleless rocketmotorhas been investigated numerically. The analysis is based on a large-eddy-simulation technique in which the spatially Ž ltered and Favre averaged conservation equations for large, energy-carrying turbulent structures are solved explicitly. The effect of the unresolved scales is modeled semi-emp...

In this paper, known probabilistic methods for estimating the thickness of boundary layer a two-dimensional laminar flow viscous incompressible fluid are extended to three-dimensional flows compressible medium. Their applicability problems boundary-layer stability is studied with LOTRAN3 software package, which allows us compute position laminar-turbulent transition in aerodynamic configurations.

An implicit multigrid-driven algorithm for two-dimensional incompressible laminar viscous ows has been coupled with a solution adaptation method and a mesh movement method for boundary movement. Time-dependent calculations are performed implicitly by regarding each time step as a steady-state problem in pseudo-time. The method of arti cial compressibility is used to solve the ow equations. The ...

5 Simple example problems 20 5.1 Cantilever beam . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 5.2 Frequency calculation of a beam loaded by compressive forces . . 27 5.3 Frequency calculation of a rotating disk on a slender shaft . . . . 29 5.4 Thermal calculation of a furnace . . . . . . . . . . . . . . . . . . 35 5.5 Seepage under a dam . . . . . . . . . . . . . . . . . . . . . . ...

We define a laminar branched surface to be a branched surface satisfying the following conditions: (1) Its horizontal boundary is incompressible; (2) there is no monogon; (3) there is no Reeb component; (4) there is no sink disk (after eliminating trivial bubbles in the branched surface). The first three conditions are standard in the theory of branched surfaces, and a sink disk is a disk branc...

Direct numerical simulation (DNS) is used to study the evolution of a boundary layer that was laminar initially followed by separation and then reattachment owing to generation of turbulence. This creates a closed region of recirculation, known as the laminar-separation bubble. The present simulation emulates the flow environment encountered in a modern LP turbine blade, where a laminar separat...

In this paper, an HLLC-type contact preserving Riemann solver for incompressible two-phase flows using the artificial compressibility formulation is presented. This improvement over previous HLLC-VOF (Bhat and Mandal, 2019). work, unlike formulation, variation of volume fraction taken into account when calculating eigenvalues eigenvectors. Hence, equations intermediate states wave speed are clo...

High-speed rotor rotation under the low-density condition creates a special low-Reynolds compressible flow around blade airfoil where compressibility effect on laminar separated shear layer occurs. However, and shock wave generation associated with increase in Mach number (M) trend change due to their interference have not been clarified. The purpose is clear its impact of field aerodynamics. T...

using the highly recommended numerical techniques, a finite element computer code is developed to analyse the steady incompressible, laminar and turbulent flows in 2-d domains with complex geometry. the petrov-galerkin finite element formulation is adopted to avoid numerical oscillations. turbulence is modeled using the two equation k-ω model. the discretized equations are written in the form o...

The relation between the Lattice Boltzmann Method, which has recently become popular, and the Kinetic Schemes, which are routinely used in Computational Fluid Dynamics, is explored. A new discrete velocity model for the numerical solution of Navier–Stokes equations for incompressible fluid flow is presented by combining both the approaches. The new scheme can be interpreted as a pseudo-compress...